A Spectroscopic and Photometric Exploration of the C/M Ratio in the Disk of M31

23 Jul 2015Katherine M. HamrenConstance M. RockosiPuragra GuhathakurtaMartha L. BoyerGraeme H. SmithJulianne J. DalcantonDylan GregersenAnil C. SethAlexia R. LewisBenjamin F. WilliamsElisa TolobaLeo GirardiClaire E. DormanKaroline M. GilbertDaniel R. Weisz

We explore the ratio (C/M) of carbon-rich to oxygen-rich thermally pulsing asymptotic giant branch(TP-AGB) stars in the disk of M31 using a combination of moderate-resolution optical spectroscopy from the Spectroscopic Landscape of Andromeda's Stellar Halo (SPLASH) survey and six-filter Hubble Space Telescope photometry from the Panchromatic Hubble Andromeda Treasury (PHAT) survey.Carbon stars were identified spectroscopically. Oxygen-rich M-stars were identifed using three different photometric definitions designed to mimic, and thus evaluate, selection techniques common in the literature... (read more)

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