Horizontal-Branch Stars as Sources of the UV Upturn in Early-Type Galaxies

It is now believed that the UV upturn sources in nearby early-type galaxies are horizontal-branch (HB) stars and their progeny. Recent studies have suggested that the HB temperature variation is mainly caused by age along with metallicity, which makes the UV upturn attractive as a potential age indi...

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Published inAstrophysics and space science Vol. 291; no. 3; pp. 223 - 230
Main Authors Yoon, Suk-Jin, Lee, Young-Wook, Rey, Soo-Chang, Ree, Chang H., Yi, Sukyoung Ken
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Nature B.V 01.01.2004
Subjects
Astrophysics
Galaxies
Stars
Stars & galaxies
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Summary:It is now believed that the UV upturn sources in nearby early-type galaxies are horizontal-branch (HB) stars and their progeny. Recent studies have suggested that the HB temperature variation is mainly caused by age along with metallicity, which makes the UV upturn attractive as a potential age indicator for presumably the oldest populations in the universe-elliptical galaxies. However, the age explanation for HB temperature variation still has a number of hurdles to pass. Here, we summarize the pros and cons of the age hypothesis and report our recent progress in understanding of HB stars. Finally, we discuss whether it is valid to assume that the UV upturn can reliably date early-type galaxies.
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ISSN:0004-640X
1572-946X
DOI:10.1023/B:ASTR.0000044325.31072.4d