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A point source survey of M31 with the Spitzer Space Telescope

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arxiv 0807.0941 v1 pith:ICM4MEIY submitted 2008-07-07 astro-ph

A point source survey of M31 with the Spitzer Space Telescope

classification astro-ph
keywords infrarediracmanypopulationspacespitzersurveytelescope
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore the stellar population of M31 in a Spitzer Space Telescope survey utilizing IRAC and MIPS observations. Red supergiants are the brightest objects seen in the infrared; they are a prominent evolutionary phase. Due to their circumstellar envelopes, many of these radiate the bulk of their luminosity at IRAC wavelengths and do not stand out in the near infrared or optically. Going fainter, we see large numbers of luminous asymptotic giant branch (AGB) stars, many of which are known long period variables. Relative to M33, the AGB carbon star population of M31 appears sparse, but this needs to be spectroscopically confirmed.

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