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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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