The Period-Luminosity Relation for Long-Period Variables in M31

Details The Period-Luminosity Relation for Long-Period Variables in M31 The Period-Luminosity Relation for Long-Period Variables in M31

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..154..623m&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 154, Issue 2, pp. 623-631.

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Galaxies: Individual: Messier Number: M31, Infrared: Stars, Stars: Agb And Post-Agb, Stars: Variables: Other

Scientific paper

A significant fraction of the disk of M31 has been surveyed for long-period variable stars. We report the results, including near-infrared photometry of almost 2000 variables, and light curves in the i band. The period-luminosity relation suggests that most of the variables are asymptotic giant branch stars, and their luminosity function can be understood in terms of mass-loss rates, which increase with increasing luminosity on the giant branch, and star formation rates, which were a few times higher a billion years ago in M31 than they are today. We see some supergiant long-period variables, but somewhat fewer than expected based on their frequency in M33, and confined to the ring of star formation in M31 seen in the IRAS and 2MASS surveys.

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