Horizontal-branch stars as sources of the UV upturn in early-type galaxies

Suk Jin Yoon; Young Wook Lee; Soo Chang Rey; Chang H. Ree; Sukyoung Ken Yi

doi:10.1023/B:ASTR.0000044325.31072.4d

Horizontal-branch stars as sources of the UV upturn in early-type galaxies

Suk Jin Yoon, Young Wook Lee, Soo Chang Rey, Chang H. Ree, Sukyoung Ken Yi

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	223-230
Number of pages	8
Journal	Astrophysics and Space Science
Volume	291
Issue number	3-4
DOIs	https://doi.org/10.1023/B:ASTR.0000044325.31072.4d
Publication status	Published - 2004

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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abstract = "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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AU - Yoon, Suk Jin

AU - Lee, Young Wook

AU - Rey, Soo Chang

AU - Ree, Chang H.

AU - Yi, Sukyoung Ken

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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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Horizontal-branch stars as sources of the UV upturn in early-type galaxies

Abstract

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