Evolution and pulsation of red supergiants at different metallicities
文献类型：期刊论文
| 作者 | Guo JH(郭建恒)1 ; Li Y(李焱)1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2002-01-20 |
| 卷号 | 565期号:1页码:559-570 |
| 关键词 | Cepheids stars : abundances stars : evolution stars : statistics stars : variables : other |
| ISSN号 | 0004-637X |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Guo, JH (reprint author), Natl Astron Observ, Yunnan Observ, POB 110, Kunming, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/0004-637X/565/1/559/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000173507200047 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5159]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 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 |
| 推荐引用方式 GB/T 7714 | Guo JH,Li Y. Evolution and pulsation of red supergiants at different metallicities[J]. ASTROPHYSICAL JOURNAL,2002,565(1):559-570. |
| APA | Guo JH,&Li Y.(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. |
入库方式： OAI收割
来源：云南天文台
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