The Period‐Luminosity Relation for Long‐Period Variables in M31 | Zendy

J. R. Mould | Zendy; Abhijit Saha | Zendy; Shaun M. G. Hughes | Zendy

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

Author(s) -

J. R. Mould,

Abhijit Saha,

Shaun M. G. Hughes

Publication year - 2004

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/422875

Subject(s) - physics , astrophysics , astronomy , photometry (optics) , supergiant , luminosity , variable star , stars , asymptotic giant branch , red supergiant , light curve , luminosity function , period (music) , cepheid variable , spiral galaxy , giant star , galaxy , acoustics

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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