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| Paper: |
Presenting Optical Spectra of AGB Stars in M31 |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
441 |
| Authors: |
Hamren, K.; Guhathakurta, P.; Toloba, E.; Dorman, C. E.; Seth, A. C.; SPLASH Collaboration; PHAT Collaboration |
| Abstract: |
We present optical spectra of oxygen- and carbon-rich AGB stars in the
disk of the Andromeda spiral galaxy (M31). Our AGB sample is drawn from
the ∼10 000 stars covered by both the Spectroscopic
and Photometric Landscape of Andromeda's Stellar Halo (SPLASH)
survey and the Panchromatic Hubble Andromeda Treasury (PHAT) survey.
This dual coverage
means that we have moderate resolution optical spectra taken with the
DEIMOS spectrograph on the Keck II 10-m telescope, as well as six-filter
HST photometry spanning the ultraviolet, optical and infrared.
Our full AGB sample contains 143 carbon-rich AGB stars (C stars) and
∼1700 oxygen-rich AGB stars (M giants). We explore the spatial and
kinematic distribution of these stars, the C/M ratio, spectral trends as
a function of physical properties, and the fit to synthetic photometry. |
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