55
55
Sep 22, 2013
09/13
by
C. Baldovin-Saavedra; M. Audard; M. Güdel; L. M. Rebull; D. L. Padgett; S. L. Skinner; A. Carmona; A. M. Glauser; S. B. Fajardo-Acosta
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Our knowledge of circumstellar disks has traditionally been based on studies of dust. However, gas dominates the disk mass and its study is key to understand the star and planet formation process. Spitzer can access gas emission lines in the mid-infrared, providing new diagnostics of the physical conditions in accretion disks and outflows. We have studied the spectra of 64 pre-main-sequence stars in Taurus using Spitzer/IRS observations. We have detected H2 (17.03, 28.22 $\mu$m) emission in 6...
Source: http://arxiv.org/abs/1101.3707v1
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31
Sep 18, 2013
09/13
by
L. M. Rebull; S. Guieu; J. R. Stauffer; L. A. Hillenbrand; A. Noriega-Crespo; K. R. Stapelfeldt; S. J. Carey; J. M. Carpenter; D. M. Cole; D. L. Padgett; S. E. Strom; S. C. Wolff
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We present observations of ~7 square degrees of the North American and Pelican Nebulae region at 24, 70, and 160 microns with the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS). We incorporate the MIPS observations with earlier Spitzer Infrared Array Camera (IRAC) observations, as well as archival near-infrared (IR) and optical data. We use the MIPS data to identify 1286 young stellar object (YSO) candidates. IRAC data alone can identify 806 more YSO candidates, for a...
Source: http://arxiv.org/abs/1102.0573v1
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35
Sep 23, 2013
09/13
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M. R. Meyer; D. Backman; S. V. W. Beckwith; T. Y. Brooke; J. M. Carpenter; M. Cohen; U. Gorti; T. Henning; L. A. Hillenbrand; D. Hines; D. Hollenbach; J. Lunine; R. Malhotra; E. Mamajek; P. Morris; J. Najita; D. L. Padgett; D. Soderblom; J. Stauffer; S. E. Strom; D. Watson; S. Weidenschilling; E. Young
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We will utilize the sensitivity of SIRTF through the Legacy Science Program to carry out spectrophotometric observations of solar-type stars aimed at (1) defining the timescales over which terrestrial and gas giant planets are built, from measurements diagnostic of dust/gas masses and radial distributions; and (2) establishing the diversity of planetary architectures and the frequency of planetesimal collisions as a function of time through observations of circumstellar debris disks. Together,...
Source: http://arxiv.org/abs/astro-ph/0109038v1
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134
Jul 20, 2013
07/13
by
C. W. Engelbracht; K. D. Gordon; G. J. Bendo; P. G. Perez-Gonzalez; K. A. Misselt; G. H. Rieke; E. T. Young; D. C. Hines; D. M. Kelly; J. A. Stansberry; C. Papovich; J. E. Morrison; E. Egami; K. Y. L. Su; J. Muzerolle; H. Dole; A. Alonso-Herrero; J. L. Hinz; P. S. Smith; W. B. Latter; A. Noriega-Crespo; D. L. Padgett; J. Rho; D. T. Frayer; S. Wachter
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We present images of the galaxy NGC 55 at 24, 70, and 160 micron obtained with the Multiband Imaging Photometer for Spitzer (MIPS) instrument aboard the Spitzer Space Telescope. The new images display the far infrared emission in unprecedented detail and demonstrate that the infrared morphology differs dramatically from that at shorter wavelengths. The most luminous emission region in the galaxy is marginally resolved at 24 micron and has a projected separation of nearly 520 pc from the peak...
Source: http://arxiv.org/abs/astro-ph/0406192v1
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73
Jul 20, 2013
07/13
by
C. H. Young; J. K. Joergensen; Y. L. Shirley; J. Kauffmann; T. Huard; S. -P. Lai; C. W. Lee; A. Crapsi; T. L. Bourke; C. P. Dullemond; T. Y. Brooke; A. Porras; W. Spiesman; L. E. Allen; G. A. Blake; N. J. Evans II; P. M. Harvey; D. W. Koerner; L. G. Mundy; P. C. Myers; D. L. Padgett; A. I. Sargent; K. R. Stapelfeldt; E. F. van Dishoeck; F. Bertoldi; N. Chapman; L. Cieza; C. H. DeVries; N. A. Ridge; Z. Wahhaj
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We present observations of L1014, a dense core in the Cygnus region previously thought to be starless, but data from the Spitzer Space Telescope shows the presence of an embedded source. We propose a model for this source that includes a cold core, heated by the interstellar radiation field, and a low-luminosity internal source. The low luminosity of the internal source suggests a substellar object. If L1014 is representative, other "starless" cores may turn out to harbor central...
Source: http://arxiv.org/abs/astro-ph/0406371v1
100
100
Jul 20, 2013
07/13
by
M. R. Meyer; L. A. Hillenbrand; D. E. Backman; S. V. W. Beckwith; J. Bouwman; T. Y. Brooke; J. M. Carpenter; M. Cohen; U. Gorti; T. Henning; D. C. Hines; D. Hollenbach; J. S. Kim; J. Lunine; R. Malhotra; E. E. Mamajek; S. Metchev; A. Moro--Martin; P. Morris; J. Najita; D. L. Padgett; J. Rodmann; M. D. Silverstone; D. R. Soderblom; J. R. Stauffer; E. B. Stobie; S. E. Strom; D. M. Watson; S. J. Weidenschilling; S. Wolf; E. Young; C. W. Engelbracht; K. D. Gordon; K. Misselt; J. Morrison; J. Muzerolle; K. Su
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We present 3-160 micron photometry obtained with the IRAC and MIPS instruments for the first five targets from the Spitzer Legacy Science Program "Formation and Evolution of Planetary Systems" and 4-35 micron spectro-photometry obtained with the IRS for two sources. We discuss in detail our observations of the debris disks surrounding HD 105 (G0V, 30 +- 10 Myr) and HD 150706 (G3V, ~ 700 +- 300 Myr). For HD 105, possible interpretations include large bodies clearing the dust inside of...
Source: http://arxiv.org/abs/astro-ph/0406301v1
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66
Jul 20, 2013
07/13
by
W. Brandner; S. Sheppard; H. Zinnecker; L. Close; F. Iwamuro; A. Krabbe; T. Maihara; K. Motohara; D. L. Padgett; A. Tokunaga
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Observations of the rho Ophiuchi star forming region with VLT ANTU and ISAAC under 0.35" seeing conditions reveal two bipolar reflection nebulosities intersected by central dust lanes. The sources (OphE-MM3 and CRBR 2422.8-3423) can be identified as spatially resolved circumstellar disks viewed close to edge-on, similar to edge-on disk sources discovered previously in the Taurus and Orion star forming regions. Millimeter continuum fluxes yield disk masses of the order of 0.01 Mo, i.e....
Source: http://arxiv.org/abs/astro-ph/0009141v1
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30
Sep 19, 2013
09/13
by
S. Guieu; C. Pinte; J. -L. Monin; F. Menard; M. Fukagawa; D. L. Padgett; A. Noriega-Crespo; S. J. Carey; L. M. Rebull; T. Huard; M. Guedel
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Aims : We want to investigate whether brown dwarfs (BDs) form like stars or are ejected embryos. We study the presence of disks around BDs in the Taurus cloud, and discuss implications for substellar formation models. Methods : We use photometric measurements from the visible to the far infrared to determine the spectral energy distributions (SEDs) of Taurus BDs. Results: We use Spitzer color indices, Halpha as an accretion indicator, and models fit to the SEDs in order to estimate physical...
Source: http://arxiv.org/abs/astro-ph/0701251v1
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55
Sep 19, 2013
09/13
by
L. M. Rebull; K. R. Stapelfeldt; N. J. Evans II; J. K. Joergensen; P. M. Harvey; T. Y. Brooke; T. L. Bourke; D. L. Padgett; N. L. Chapman; S. -P. Lai; W. J. Spiesmann; A. Noreiga-Crespo; B. Merin; T. Huard; L. E. Allen; G. A. Blake; T. Jarrett; D. W. Koerner; L. G. Mundy; P. C. Myers; A. I. Sargent; E. F. van Dishoeck; Z. Wahhaj; K. E. Young
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eye 55
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We present observations of 10.6 square degrees of the Perseus molecular cloud at 24, 70, and 160 microns with the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS). The image mosaics show prominent, complex extended emission dominated by illuminating B stars on the East side of the cloud, and by cold filaments of 160 micron emission on the West side. Of 3950 point sources identified at 24 microns, 1141 have 2MASS counterparts. A quarter of these populate regions of the Ks...
Source: http://arxiv.org/abs/astro-ph/0701711v1
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42
Sep 23, 2013
09/13
by
D. C. Hines; D. E. Backman; J. Bouwman; L. A. Hillenbrand; J. M. Carpenter; M. R. Meyer; J. S. Kim; M. D. Silverstone; J. Rodmann; S. Wolf; E. E. Mamajek; T. Y. Brooke; D. L. Padgett; T. Henning; A. Moro-Martin; E. Stobie; K. D. Gordon; J. E. Morrison; J. Muzerolle; K. Y. L. Su
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eye 42
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We report the discovery of a debris system associated with the $\sim 30$ Myr old G3/5V star HD 12039 using {\it Spitzer Space Telescope} observations from 3.6 -- 160$\mu$m. An observed infrared excess (L$_{\rm IR}$/L$_{\ast} = 1\times10^{-4}$) above the expected photosphere for $\lambda \gtrsim 14\mu$m is fit by thermally emitting material with a color temperature of T$\sim 110$ K, warmer than the majority of debris disks identified to date around Sun-like stars. The object is not detected at...
Source: http://arxiv.org/abs/astro-ph/0510294v1
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37
Jul 20, 2013
07/13
by
M. Guedel; D. L. Padgett; C. Dougados
texts
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(abridged:) The Taurus Molecular Cloud (TMC) contains numerous prototypical examples of deeply embedded protostars with massive disks and outflows, classical and weak-lined T Tauri stars, jets and Herbig-Haro objects, and a growing number of confirmed brown dwarfs. Star formation is ongoing, and the cloud covers all stages of pre-main sequence stellar evolution. We have initiated comprehensive surveys of the TMC, in particular including: (i) a deep X-ray survey of about 5 sq. degrees with...
Source: http://arxiv.org/abs/astro-ph/0609520v1
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43
Sep 18, 2013
09/13
by
C. W. Engelbracht; M. Blaylock; K. Y. L. Su; J. Rho; G. H. Rieke; J. Muzerolle; D. L. Padgett; D. C. Hines; K. D. Gordon; D. Fadda; A. Noriega-Crespo; D. M. Kelly; W. B. Latter; J. L. Hinz; K. A. Misselt; J. E. Morrison; J. A. Stansberry; D. L. Shupe; S. Stolovy; Wm. A. Wheaton; E. T. Young; G. Neugebauer; S. Wachter; P. G. Pérez-González; D. T. Frayer; F. R. Marleau
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eye 43
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We present the stellar calibrator sample and the conversion from instrumental to physical units for the 24 micron channel of the Multiband Imaging Photometer for Spitzer (MIPS). The primary calibrators are A stars, and the calibration factor based on those stars is 4.54*10^{-2} MJy sr^{-1} (DN/s)^{-1}, with a nominal uncertainty of 2%. We discuss the data-reduction procedures required to attain this accuracy; without these procdures, the calibration factor obtained using the automated pipeline...
Source: http://arxiv.org/abs/0704.2195v1
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48
Sep 18, 2013
09/13
by
K. D. Gordon; G. H. Rieke; C. W. Engelbracht; J. Muzerolle; J. A. Stansberry; K. A. Misselt; J. E. Morrison; J. Cadien; E. T. Young; H. Dole; D. M. Kelly; A. Alonso-Herrero; E. Egami; K. Y. L. Su; C. Papovich; P. S. Smith; D. C. Hines; M. J. Rieke; M. Blaylock; W. B. Latter; P. Perez-Gonzalez; E. LeFloc'h; J. L. Hinz; T. Hesselroth; D. T. Frayer; A. Noriega-Crespo; F. J. Masci; D. L. Padgett; M. P. Smylie; N. M. Haegel
texts
eye 48
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We describe the data reduction algorithms for the Multiband Imaging Photometer for Spitzer (MIPS) instrument. These algorithms were based on extensive preflight testing and modeling of the Si:As (24 micron) and Ge:Ga (70 and 160 micron) arrays in MIPS and have been refined based on initial flight data. The behaviors we describe are typical of state-of-the-art infrared focal planes operated in the low backgrounds of space. The Ge arrays are bulk photoconductors and therefore show a variety of...
Source: http://arxiv.org/abs/astro-ph/0502079v1
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38
Sep 21, 2013
09/13
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L. M. Rebull; X. P. Koenig; D. L. Padgett; S. Terebey; P. M. McGehee; L. A. Hillenbrand; G. Knapp; D. Leizawitz; W. Liu; A. Noriega-Crespo; M. Ressler; K. R. Stapelfeldt; S. Fajardo-Acosta; A. Mainzer
texts
eye 38
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The Taurus Molecular Cloud subtends a large solid angle on the sky, in excess of 250 square degrees. The search for legitimate Taurus members to date has been limited by sky coverage as well as the challenge of distinguishing members from field interlopers. The Wide-field Infrared Survey Explorer (WISE) has recently observed the entire sky, and we take advantage of the opportunity to search for young stellar object (YSO) candidate Taurus members from a ~260 square degree region designed to...
Source: http://arxiv.org/abs/1106.5080v1
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27
Sep 22, 2013
09/13
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D. L. Padgett; L. Cieza; K. R. Stapelfeldt; N. J. Evans; D. Koerner; A. Sargent; M. Fukagawa; E. F. van Dishoek; J. Augereau; L. Allen; G. Blake; T. Brooke; N. Chapman; P. Harvey; A. Porras; S. Lai; L. Mundy; P. C. Myers; W. Spiesman; Z. Wahhaj
texts
eye 27
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Using the Spitzer Space Telescope, we have observed 90 weak-line and classical T Tauri stars in the vicinity of the Ophiuchus, Lupus, Chamaeleon, and Taurus star-forming regions as part of the Cores to Disks (c2d) Spitzer Legacy project. In addition to the Spitzer data, we have obtained contemporaneous optical photometry to assist in constructing spectral energy distributions. These objects were specifically chosen as solar-type young stars with low levels of H alpha emission, strong X-ray...
Source: http://arxiv.org/abs/astro-ph/0603370v1
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120
Jul 20, 2013
07/13
by
M. Guedel; K. R. Briggs; K. Arzner; M. Audard; J. Bouvier; E. D. Feigelson; E. Franciosini; A. Glauser; N. Grosso; G. Micela; J. -L. Monin; T. Montmerle; D. L. Padgett; F. Palla; I. Pillitteri; L. Rebull; L. Scelsi; B. Silva; S. L. Skinner; B. Stelzer; A. Telleschi
texts
eye 120
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(abridged:) The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST) surveys the most populated ~5 square degrees of the Taurus star formation region, using the XMM-Newton X-ray observatory to study the thermal structure, variability, and long-term evolution of hot plasma, to investigate the magnetic dynamo, and to search for new potential members of the association. Many targets are also studied in the optical, and high-resolution X-ray grating spectroscopy has been obtained for...
Source: http://arxiv.org/abs/astro-ph/0609160v2
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41
Sep 18, 2013
09/13
by
K. D. Gordon; G. H. Rieke; C. W. Engelbracht; J. Muzerolle; J. A. Stansberry; K. A. Misselt; J. E. Morrison; J. Cadien; E. T. Young; H. Dole; D. M. Kelly; A. Alonso-Herrero; E. Egami; K. Y. L. Su; C. Papovich; P. S. Smith; D. C. Hines; M. J. Rieke; M. Blaylock; P. Perez-Gonzalez; E. LeFloc'h; J. L. Hinz; W. B. Latter; T. Hesselroth; D. T. Frayer; A. Noriega-Crespo; F. J. Masci; D. L. Padgett; M. P. Smylie; N. M. Haegel
texts
eye 41
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The first six months of flight data from the Multiband Imaging Photometer for Spitzer (MIPS) were used to test MIPS reduction algorithms based on extensive preflight laboratory data and modeling. The underlying approach for the preflight algorithms has been found to be sound, but some modifications have improved the performance. The main changes are scan mirror dependent flat fields at 24 micron, hand processing to remove the time dependent stim flash latents and fast/slow response variations...
Source: http://arxiv.org/abs/astro-ph/0502080v1
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45
Sep 20, 2013
09/13
by
A. Noriega-Crespo; A. Moro-Martin; S. Carey; P. W. Morris; D. L. Padgett; W. B. Latter; J. Muzerolle
texts
eye 45
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New early release observations of the Cepheus E outflow and its embedded source, obtained with the Spitzer Space Telescope, are presented. We show the driving source is detected in all 4 IRAC bands, which suggests that traditional Class 0 classification, although essentially correct, needs to accommodate the new high sensitivity infrared arrays and their ability to detected deeply embedded sources. The IRAC, MIPS 24 and 70 microns new photometric points are consistent with a spectral energy...
Source: http://arxiv.org/abs/astro-ph/0506710v1
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42
Sep 22, 2013
09/13
by
N. Flagey; A. Noriega-Crespo; F. Boulanger; S. J. Carey; T. Y. Brooke; E. Falgarone; T. L. Huard; C. E. McCabe; M. A. Miville-Deschênes; D. L. Padgett; R. Paladini; L. M. Rebull
texts
eye 42
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We present Spitzer images of the Taurus Complex (TC) and take advantage of the sensitivity and spatial resolution of the observations to characterize the diffuse IR emission across the cloud. This work highlights evidence of dust evolution within the translucent sections of the archetype reference for studies of quiescent molecular clouds. We combine Spitzer 160 um and IRAS 100 um observations to produce a dust temperature map and a far-IR dust opacity map at 5' resolution. The average dust...
Source: http://arxiv.org/abs/0906.5025v1
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61
Sep 23, 2013
09/13
by
S. Wolf; A. Schegerer; H. Beuther; D. L. Padgett; K. R. Stapelfeldt
texts
eye 61
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We present a spatially resolved 894 micron map of the circumstellar disk of the Butterfly star in Taurus (IRAS 04302+2247), obtained with the Submillimeter Array (SMA). The predicted and observed radial brightness profile agree well in the outer disk region, but differ in the inner region with an outer radius of ~80-120 AU. In particular, we find a local minimum of the radial brightness distribution at the center, which can be explained by an increasing density / optical depth combined with the...
Source: http://arxiv.org/abs/0801.1422v1
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37
Sep 18, 2013
09/13
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I. Pascucci; U. Gorti; D. Hollenbach; J. Najita; M. R. Meyer; J. M. Carpenter; L. A. Hillenbrand; G. J. Herczeg; D. L. Padgett; E. E. Mamajek; M. D. Silverstone; W. M. Schlingman; J. S. Kim; E. B. Stobie; J. Bouwman; S. Wolf; J. Rodmann; D. C. Hines; J. Lunine; R. Malhotra
texts
eye 37
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We have carried out a sensitive search for gas emission lines at infrared and millimeter wavelengths for a sample of 15 young sun-like stars selected from our dust disk survey with the Spitzer Space Telescope. We have used mid-infrared lines to trace the warm (300-100 K) gas in the inner disk and millimeter transitions of 12CO to probe the cold (~20 K) outer disk. We report no gas line detections from our sample. Line flux upper limits are first converted to warm and cold gas mass limits using...
Source: http://arxiv.org/abs/astro-ph/0606669v1
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43
Jul 20, 2013
07/13
by
J. Muzerolle; S. T. Megeath; R. A. Gutermuth; L. E. Allen; J. L. Pipher; L. Hartmann; K. D. Gordon; D. L. Padgett; A. Noriega-Crespo; P. C. Myers; G. G. Fazio; G. H. Rieke; E. T. Young; J. E. Morrison; D. C. Hines; K. Y. L. Su; C. W. Engelbracht; K. A. Misselt
texts
eye 43
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We present observations of the star formation region NGC 7129 taken with the Multiband Imaging Photometer for Spitzer (MIPS). A significant population of sources, likely pre-main sequence members of the young stellar cluster, is revealed outside the central photoionization region. Combining with Infrared Array Camera (IRAC) and ground-based near-infrared images, we have obtained colors and spectral energy distributions for some 60 objects. The [3.6]-[4.5] vs. [8]-[24] color-color plane shows...
Source: http://arxiv.org/abs/astro-ph/0406065v1
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59
Sep 21, 2013
09/13
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C. Pinte; D. L. Padgett; F. Menard; K. R. Stapelfeldt; G. Schneider; J. Olofsson; O. Panic; J. C. Augereau; G. Duchene; J. Krist; K. Pontoppidan; M. D. Perrin; C. A. Grady; J. Kessler-Silacci; E. F. van Dishoeck; D. Lommen; M. Silverstone; D. C. Hines; S. Wolf; G. A. Blake; T. Henning; B. Stecklum
texts
eye 59
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We present a panchromatic study, involving a multiple technique approach, of the circumstellar disc surrounding the T Tauri star IM Lupi (Sz 82). We have undertaken a comprehensive observational study of IM Lupi using photometry, spectroscopy, millimetre interferometry and multi-wavelength imaging. For the first time, the disc is resolved from optical and near-infrared wavelengths in scattered light, to the millimetre regime in thermal emission. Our data-set, in conjunction with existing...
Source: http://arxiv.org/abs/0808.0619v1
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46
Sep 18, 2013
09/13
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L. M. Rebull; C. H. Johnson; J. C. Gibbs; M. Linahan; D. Sartore; R. Laher; M. Legassie; J. D. Armstrong; L. E. Allen; P. McGehee; D. L. Padgett; S. Aryal; K. S. Badura; T. S. Canakapalli; S. Carlson; M. Clark; N. Ezyk; J. Fagan; N. Killingstad; S. Koop; T. McCanna; M. M. Nishida; T. R. Nuthmann; A. O'Bryan; A. PUllinger; A. Rameswaram; T. Ravelomanantsoa; H. Sprow; C. M. Tilley
texts
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We used archival Spitzer Space Telescope mid-infrared data to search for young stellar objects (YSOs) in the immediate vicinity of two bright-rimmed clouds, BRC 27 (part of CMa R1) and BRC 34 (part of the IC 1396 complex). These regions both appear to be actively forming young stars, perhaps triggered by the proximate OB stars. In BRC 27, we find clear infrared excesses around 22 of the 26 YSOs or YSO candidates identified in the literature, and identify 16 new YSO candidates that appear to...
Source: http://arxiv.org/abs/1211.1341v1
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30
Sep 18, 2013
09/13
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D. T. Frayer; D. Fadda; L. Yan; F. R. Marleau; P. I. Choi; G. Helou; B. T. Soifer; P. N. Appleton; L. Armus; R. Beck; H. Dole; C. W. Engelbracht; F. Fang; K. D. Gordon; I. Heinrichsen; D. Henderson; T. Hesselroth; M. Im; D. M. Kelly; M. Lacy; S. Laine; W. B. Latter; W. Mahoney; D. Makovoz; F. J. Masci; J. E. Morrison; M. Moshir; A. Noriega-Crespo; D. L. Padgett; M. Pesenson; D. L. Shupe; G. K. Squires; L. J. Storrie-Lombardi; J. A. Surace; H. I. Teplitz; G. Wilson
texts
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We present Spitzer 70um and 160um observations of the Spitzer extragalactic First Look Survey (xFLS). The data reduction techniques and the methods for producing co-added mosaics and source catalogs are discussed. Currently, 26% of the 70um sample and 49% of the 160um-selected sources have redshifts. The majority of sources with redshifts are star-forming galaxies at z
Source: http://arxiv.org/abs/astro-ph/0509649v1
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34
Sep 20, 2013
09/13
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N. Lu; P. S. Smith; C. W. Engelbracht; A. Noriega-Crespo; J. Morrison; K. D. Gordon; J. Stansberry; F. R. Marleau; G. H. Rieke; R. Paladini; D. L. Padgett; J. Keene; W. B. Latter; D. Fadda; J. Rho
texts
eye 34
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The Spectral Energy Distribution (SED) mode of the Multiband Imaging Photometer for Spitzer (MIPS) Space Telescope provides low-spectral resolution (R ~ 15-25) spectroscopy in the far infrared using the MIPS 70 um detector. A reflective grating provides a dispersion of 1.7 um per pixel, and an effective wavelength coverage of 52.8--98.7 um over detector rows 1-27. The final 5 detector rows are contaminated by second-order diffracted light and are left uncalibrated. The flux calibration is based...
Source: http://arxiv.org/abs/0802.3723v1
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52
Jul 20, 2013
07/13
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A. M. Glauser; F. Ménard; C. Pinte; G. Duchêne; M. Güdel; J. -L. Monin; D. L. Padgett
texts
eye 52
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We present a study of the circumstellar environment of IRAS 04158+2805 based on multi-wavelength observations and models. Images in the optical and near-infrared, a polarisation map in the optical, and mid-infrared spectra were obtained with VLT-FORS1, CFHT-IR, and Spitzer-IRS. Additionally we used an X-ray spectrum observed with Chandra. We interpret the observations in terms of a central star surrounded by an axisymmetric circumstellar disc, but without an envelope, to test the validity of...
Source: http://arxiv.org/abs/0804.3483v1
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33
Sep 23, 2013
09/13
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S. Guieu; L. M. Rebull; J. R. Stauffer; L. A. Hillenbrand; J. M. Carpenter; A. Noriega-Crespo; D. L. Padgett; D. M. Cole; S. J. Carey; K. R. Stapelfeldt; S. E. Strom
texts
eye 33
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We present a 9 deg^2 map of the North American and Pelican Nebulae regions obtained in all four IRAC channels with the Spitzer Space Telescope. The resulting photometry is merged with that at JHKs from 2MASS and a more spatially limited $BVI$ survey from previous ground-based work. We use a mixture of color- color diagrams to select a minimally contaminated set of more than 1600 objects that we claim are young stellar objects (YSOs) associated with the star forming region. Because our selection...
Source: http://arxiv.org/abs/0904.0279v1
