A point-source survey of M31 with the Spitzer space telescope

Jeremy Mould; Pauline Barmby; Karl Gordon; S. P. Willner; M. L.N. Ashby; R. D. Gehrz; Roberta Humphreys; Charles E. Woodward

doi:10.1086/591844

A point-source survey of M31 with the Spitzer space telescope

Jeremy Mould, Pauline Barmby, Karl Gordon, S. P. Willner, M. L.N. Ashby, R. D. Gehrz, Roberta Humphreys, Charles E. Woodward

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Abstract

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 stars (AGB), 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.

Original language	English (US)
Pages (from-to)	230-241
Number of pages	12
Journal	Astrophysical Journal
Volume	687
Issue number	1
DOIs	https://doi.org/10.1086/591844
State	Published - Nov 1 2008

Keywords

Galaxies: individual (M31)
Galaxies: stellar content

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abstract = "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 stars (AGB), 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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AU - Barmby, Pauline

AU - Gordon, Karl

AU - Willner, S. P.

AU - Ashby, M. L.N.

AU - Gehrz, R. D.

AU - Humphreys, Roberta

AU - Woodward, Charles E.

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KW - Galaxies: individual (M31)

KW - Galaxies: stellar content

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A point-source survey of M31 with the Spitzer space telescope

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