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J/ApJ/687/230 Survey of M31 with Spitzer (Mould+, 2008)
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Beginning of ReadMe :J/ApJ/687/230 Survey of M31 with Spitzer (Mould+, 2008)
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A point-source survey of M31 with the Spitzer Space Telescope.
Mould J., Barmby P., Gordon K., Willner S.P., Ashby M.L.N., Gehrz R.D.,
Humphreys R., Woodward C.E.
<Astrophys. J., 687, 230-241 (2008)>
=2008ApJ...687..230M
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ADC_Keywords: Photometry, infrared ; Stars, supergiant ; Stars, giant ; YSOs ;
Galaxies, IR
Keywords: galaxies: individual (M31) - galaxies: stellar content
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.
Description:
The IRAC data and reduction are described in Barmby et al.
(2006ApJ...650L..45B); observations of M31 were taken as part of
Spitzer General Observer program 3126 in 2005 January and August.
The MIPS resolution ranges from 6" at 24um to 40" at 160um. Gordon et
al. (2006ApJ...638L..87G) described the MIPS program surveying M31
(images were taken on 2004 August 25).