Evolution and pulsation of red supergiants at different metallicities

doi:10.1086/324295

YNAO OpenIR > 恒星物理研究组

	Evolution and pulsation of red supergiants at different metallicities
	Guo JH(郭建恒)1 ; Li Y(李焱)1,2 ; Guo, JH (reprint author), Natl Astron Observ, Yunnan Observ, POB 110, Kunming, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2002-01-20
卷号	565 期号:1 页码:559-570
DOI	10.1086/324295
产权排序	第1完成单位
收录类别	SCI
关键词	Cepheids Stars : Abundances Stars : Evolution Stars : Statistics Stars : Variables : Other
摘要	We have investigated the evolution and pulsation of 15, 20, and 30 M. stars with metallicities Z = 0.0005-0.02, by use of up-to-date opacities, mass loss through the stellar wind, and overshooting from the convective core. We have calculated the blue-to-red (B/R) ratio of supergiants for our stellar models and found that both normal and overshooting models show a tendency of decreasing B/R ratio with increasing metallicity, which is entirely opposite to what has been observed in some stellar systems. Because incorporating overshooting can significantly reduce the B/R ratio, it seems to indicate that overshooting from the convective core is strong in extremely metal-poor stars and fades gradually away with increasing metal abundance. However, many physical ingredients can affect the B/R ratio of the supergiants; our solution is not complete. We have compared the theoretical period-luminosity (P-L) relations with some long-period variables (LPVs) observed in the LMC, M33, and the Milky Way (MW). The observed LPVs are found to be in good agreement with the P-L relation of the fundamental mode for the LMC and M33, but the LPVs in the Milky Way seem to have shorter periods and seem more likely to be the first overtone pulsators. We have found that the period-luminosity relations at different metallicities show a tendency of decreasing luminosity and increasing period with increasing metal abundance, and the correction to the luminosity at a given period can be approximated by deltaM(bol) similar to 0.83delta log Z.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-637X
URL	查看原文
归档日期	2002-05-22
WOS记录号	WOS:000173507200047
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	BISYSTEM OSCILLATION-THEORY ; LARGE MAGELLANIC CLOUD ; WOLF-RAYET STARS ; M-CIRCLE-DOT ; MASSIVE STARS ; OBSERVATIONAL TESTS ; INTERMEDIATE-MASS ; STELLAR MODELS ; GALAXY ; VARIABLES
引用统计	被引频次：30[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5159
专题	恒星物理研究组
通讯作者	Guo, JH (reprint author), Natl Astron Observ, Yunnan Observ, POB 110, Kunming, Peoples R China.
作者单位	1.Yunnan Observatory, National Astronomical Observatories, P.O. Box 110, 650011 Kunming, China 2.Joint Laboratory for Optical Astronomy, Chinese Academy of Sciences
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Guo JH,Li Y,Guo, JH . Evolution and pulsation of red supergiants at different metallicities[J]. ASTROPHYSICAL JOURNAL,2002,565(1):559-570.
APA	Guo JH,Li Y,&Guo, JH .(2002).Evolution and pulsation of red supergiants at different metallicities.ASTROPHYSICAL JOURNAL,565(1),559-570.
MLA	Guo JH,et al."Evolution and pulsation of red supergiants at different metallicities".ASTROPHYSICAL JOURNAL 565.1(2002):559-570.

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Evolution and Pulsat（518KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	浏览请求全文