CARBON STARS IN THE SATELLITES AND HALO OF M31
- Department of Astronomy and Astrophysics, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States)
- The Observatories of the Carnegie Institutions for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)
- Space Telescope Science Institute, Baltimore, MD 21218 (United States)
- Observational Cosmology Lab, Code 665, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
- Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551 (United States)
We spectroscopically identify a sample of carbon stars in the satellites and halo of M31 using moderate-resolution optical spectroscopy from the Spectroscopic and Photometric Landscape of Andromeda’s Stellar Halo survey. We present the photometric properties of our sample of 41 stars, including their brightness with respect to the tip of the red giant branch (TRGB) and their distributions in various color–color spaces. This analysis reveals a bluer population of carbon stars fainter than the TRGB and a redder population of carbon stars brighter than the TRGB. We then apply principal component analysis to determine the sample’s eigenspectra and eigencoefficients. Correlating the eigencoefficients with various observable properties reveals the spectral features that trace effective temperature and metallicity. Putting the spectroscopic and photometric information together, we find the carbon stars in the satellites and halo of M31 to be minimally impacted by dust and internal dynamics. We also find that while there is evidence to suggest that the sub-TRGB stars are extrinsic in origin, it is also possible that they are are particularly faint members of the asymptotic giant branch.
- OSTI ID:
- 22667484
- Journal Information:
- Astrophysical Journal, Vol. 828, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
MUSE crowded field 3D spectroscopy in NGC 300: I. First results from central fields⋆⋆⋆
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journal | October 2018 |
Surface brightness fluctuation spectrum: a new probe of evolved stars in unresolved stellar populations
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journal | July 2018 |
| MUSE crowded field 3D spectroscopy in NGC300 I. First results from central fields | text | January 2018 |
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