THE SPITZER ATLAS OF STELLAR SPECTRA (SASS)
- NASA Herschel Science Center, California Institute of Technology, Mail Code 100-22, Pasadena, CA 91125 (United States)
- Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125 (United States)
- Department of Physics and Astronomy, University of Georgia at Athens, GA 30602-2451 (United States)
We present the Spitzer Atlas of Stellar Spectra, which includes 159 stellar spectra (5-32 {mu}m; R {approx} 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.
- OSTI ID:
- 21454890
- Journal Information:
- Astrophysical Journal, Supplement Series, Journal Name: Astrophysical Journal, Supplement Series Journal Issue: 2 Vol. 191; ISSN 0067-0049; ISSN APJSA2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKANES
AMMONIA
AROMATICS
ATMOSPHERES
DIAGRAMS
DUSTS
ELEMENTS
FLUIDS
GASES
HERTZSPRUNG-RUSSELL DIAGRAM
HYDRIDES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
LUMINOSITY
METHANE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLYCYCLIC AROMATIC HYDROCARBONS
SEMIMETALS
SILICON
STARS
STELLAR ATMOSPHERES
TELESCOPES
VAPORS
WATER VAPOR