A model of the circumstellar envelope of luminous blue variables
文献类型：期刊论文
| 作者 | Guo JH(郭建恒)1,2 ; Li Y(李焱)1; Dan HG(单红光)1
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| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2005 |
| 卷号 | 5期号:3页码:245-255 |
| 关键词 | stars : variables : LBVs stars : continuum spectrum stars : mass loss |
| ISSN号 | 1009-9271 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Guo, JH (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | The continuum energy distributions of the luminous blue variables 8127 and 8110 in the outburst phase are fitted with a circumstellar envelope model. Both stars show two peaks in their continuum, one near 1250 angstrom and the other in the optical band. We suggest that their UV and optical fluxes may have different origins: the UV flux comes from the central star while the optical flux comes from an expanding circumstellar envelope. We construct a model for LBVs consisting of two LTE atmosphere models with different temperatures, and find it to be in agreement with the observed spectral energy distributions of R127 and R110. According to our numerical experiments, R127's continuum is composed of fluxes from a circumstellar envelope of T-eff = 8000 K, R = 485R(circle dot), and log g = 1, and from a central star of T-eff = 17000K, R = 135R(circle dot), and log g = 2.5 with a permeating factor f = 0.5; while R110's continuum can be fitted by a circumstellar envelope of T-eff = 17000K, R = 350R(circle dot), and log g = 0.5, and a central star of T-eff = 25 000 K, R = 27R(circle dot), and log g = 3.0 with a permeating factor f = 0.65. Both models show that the non-spherically symmetric, optically thick regions are formed surrounding the central star in the outburst phase. The light of the central star is shielded by the circumstellar envelope so that the visual brightness increases with the decrease/increase of the temperature/radius of the optically thick regions. |
| 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] | LARGE MAGELLANIC CLOUD ; S-DORADUS VARIABLES ; EARLY-TYPE STARS ; AG-CARINAE ; STELLAR WIND ; MASS-LOSS ; VARIABILITY ; INTERMEDIATE ; EXTINCTION ; PHOTOMETRY |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1009-9271/5/3/004/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000230099500004 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5178]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 2.Graduate School of Chinese Academy of Sciences, Beijing 100039 |
| 推荐引用方式 GB/T 7714 | Guo JH,Li Y,Dan HG. A model of the circumstellar envelope of luminous blue variables[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2005,5(3):245-255. |
| APA | Guo JH,Li Y,&Dan HG.(2005).A model of the circumstellar envelope of luminous blue variables.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,5(3),245-255. |
| MLA | Guo JH,et al."A model of the circumstellar envelope of luminous blue variables".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 5.3(2005):245-255. |
入库方式： OAI收割
来源：云南天文台
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