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 | |
| Publication status | Published - 2004 Oct 25 |
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All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
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Horizontal-branch stars as sources of the UV upturn in early-type galaxies. / Yoon, Suk Jin; Lee, Young Wook; Rey, Soo Chang; Ree, Chang H.; Yi, Sukyoung Ken.
In: Astrophysics and Space Science, Vol. 291, No. 3-4, 25.10.2004, p. 223-230.Research output: Contribution to journal › Article
TY - JOUR
T1 - Horizontal-branch stars as sources of the UV upturn in early-type galaxies
AU - Yoon, Suk Jin
AU - Lee, Young Wook
AU - Rey, Soo Chang
AU - Ree, Chang H.
AU - Yi, Sukyoung Ken
PY - 2004/10/25
Y1 - 2004/10/25
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.
UR - http://www.scopus.com/inward/record.url?scp=20844448550&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=20844448550&partnerID=8YFLogxK
U2 - 10.1023/B:ASTR.0000044325.31072.4d
DO - 10.1023/B:ASTR.0000044325.31072.4d
M3 - Article
AN - SCOPUS:20844448550
VL - 291
SP - 223
EP - 230
JO - Astrophysics and Space Science
JF - Astrophysics and Space Science
SN - 0004-640X
IS - 3-4
ER -