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The Spitzer Atlas of Stellar Spectra (SASS)

Ardila, David R. and Van Dyk, Schuyler D. and Makowiecki, Wojciech and Stauffer, John and Song, Inseok and Rho, Jeonghee and Fajardo-Acosta, Sergio and Hoard, D. W. and Wachter, Stefanie (2010) The Spitzer Atlas of Stellar Spectra (SASS). Astrophysical Journal Supplement Series, 191 (2). pp. 301-339. ISSN 0067-0049.

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We present the Spitzer Atlas of Stellar Spectra, which includes 159 stellar spectra (5-32 μm; R ~ 100) taken with the Infrared Spectrograph on the Spitzer Space Telescope. This Atlas gathers representative spectra of a broad section of the Hertzsprung-Russell diagram, intended to serve as a general stellar spectral reference in the mid-infrared. It includes stars from all luminosity classes, as well as Wolf-Rayet (WR) objects. Furthermore, it includes some objects of intrinsic interest, such as blue stragglers and certain pulsating variables. All of the spectra have been uniformly reduced, and all are available online. For dwarfs and giants, the spectra of early-type objects are relatively featureless, characterized by the presence of hydrogen lines in A spectral types. Besides these, the most noticeable photospheric features correspond to water vapor and silicon monoxide in late-type objects and methane and ammonia features at the latest spectral types. Most supergiant spectra in the Atlas present evidence of circumstellar gas and/or dust. The sample includes five M supergiant spectra, which show strong dust excesses and in some cases polycyclic aromatic hydrocarbon features. Sequences of WR stars present the well-known pattern of lines of He I and He II, as well as forbidden lines of ionized metals. The characteristic flat-top shape of the [Ne III] line is evident even at these low spectral resolutions. Several Luminous Blue Variables and other transition stars are present in the Atlas and show very diverse spectra, dominated by circumstellar gas and dust features. We show that the [8]-[24] Spitzer colors (IRAC and MIPS) are poor predictors of spectral type for most luminosity classes.

Item Type:Article
Related URLs:
URLURL TypeDescription
Van Dyk, Schuyler D.0000-0001-9038-9950
Stauffer, John0000-0003-3595-7382
Song, Inseok0000-0002-5815-7372
Rho, Jeonghee0000-0003-3643-839X
Fajardo-Acosta, Sergio0000-0001-9309-0102
Hoard, D. W.0000-0002-6800-6519
Additional Information:© 2011 American Astronomical Society. Received 2010 June 17; accepted 2010 October 22; published 2010 November 30. This work is based on observations and archival data from the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech) under a contract with National Aeronautics and Space Administration (NASA). Support for this work was provided by NASA through an award issued by JPL/Caltech. This research has also made use of the NASA/Infrared Processing and Analysis Center (IPAC) Science Archive, operated by the JPL, Caltech, under contract with NASA; the SIMBAD database and the Vizier service, operated at CDS, Strasbourg, France; the data products from the Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and IPAC/Caltech, funded by NASA and the National Science Foundation. Facilities: Spitzer (IRS)
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:astronomical databases: miscellaneous; catalogs; Hertzsprung-Russell and C-M diagrams; stars: atmospheres; stars: fundamental parameters; techniques: spectroscopic
Issue or Number:2
Classification Code:PACS: 95.80.+p; 97.10.Ri; 95.30.Ky; 97.10.Zr; 97.30.Eh
Record Number:CaltechAUTHORS:20110307-093951884
Persistent URL:
Official Citation:David R. Ardila et al. 2010 ApJS 191 301 doi: 10.1088/0067-0049/191/2/301
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22681
Deposited By: Ruth Sustaita
Deposited On:08 Mar 2011 21:34
Last Modified:17 Nov 2019 02:03

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