Luminous Circumstellar Envelopes in M31

Details Luminous Circumstellar Envelopes in M31 Luminous Circumstellar Envelopes in M31

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514107s&link_type=abstract

American Astronomical Society Meeting 205, #141.07; Bulletin of the American Astronomical Society, Vol. 36, p.1579

Astronomy and Astrophysics

Astronomy

Scientific paper

We have peformed point source extraction from a Spitzer/MIPS survey of the largest galaxy in the Local Group, M31. The MIPS-24 micron image shows with unprecedented clarity the distribution of evolved stars with circumstellar envelopes in M31. These sources have typical luminosities of 103-10^4 solar, which are consistent with asymptotic giant branch and red supergiant stars with circumstellar envelopes. Our catalog is cross-correlated with 2MASS and with a recently published catalog of Long Period Variable stars. We interpret the distribution of 24 micron point sources in the context of galactic structure, identifying sources in the nucleus/bulge, arms/rings, and interarm regions. The point sources are superposed on newly revealed structures in diffuse emission emanating from the bulge and nuclear region as well as from the star forming rings seen by ISO and IRAS.

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