Journal Article

Asymptotic giant branch stars in the Sculptor dwarf spheroidal galaxy

John W. Menzies, Michael W. Feast, Patricia A. Whitelock and Noriyuki Matsunaga

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 4, pages 3492-3500
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18649.x
Asymptotic giant branch stars in the Sculptor dwarf spheroidal galaxy

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JHKS photometry is presented for a 35 arcmin2 field centred on the Sculptor dwarf spheroidal galaxy. With the aid of published kinematic data definite galaxy members are identified and the width in JK of the colour–magnitude diagram is shown to be consistent with an old population of stars with a large range in metal abundance. We identify two Asymptotic Giant Branch variables, both carbon Miras, with periods of 189 and 554 d, respectively, and discuss their ages, metallicities and mass-loss as well as their positions in the Mira period–luminosity diagram. There is evidence for a general period–age relation for Local Group Miras. The mass-loss rate for the 554-d variable, MAG29, appears to be consistent with that found for Miras of comparable period in other Local Group galaxies.

Keywords: stars: AGB and post-AGB; stars: carbon; galaxies: individual: Sculptor–Local Group; galaxies: stellar content

Journal Article.  6367 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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