Estimating the structure and geometry of winds from luminous blue variables via fitting the continuum energy distributions
文献类型：期刊论文
| 作者 | Guo JH(郭建恒)1,2 ; Li Y(李焱)1
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2007-04-20 |
| 卷号 | 659期号:2页码:1563-1575 |
| ISSN号 | 0004-637X |
| 关键词 | stars : mass loss stars : variables : other |
| 通讯作者 | Guo, JH (reprint author), Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | By combining the UV spectra from IUE with photometric data in the optical band, we present a quantitative study on the continuum energy distributions of LBVs to determine the structure and geometry of LBV winds. It is shown that the shape of continuum energy distributions around the Balmer jump is sensitive to the velocity law of LBV winds. A simple, spherically symmetric wind model including free-bound and free-free radiation is constructed to compute the continuum energy distributions of LBVs. By matching theoretical ones to the observed continuum energy distributions around the Balmer jump, we have obtained value of the exponent of the velocity law beta in both minimum and maximum state for five LBVs, i.e., AG Car, HR Car, R40, S Dor, and R127. We have found that beta is about 0.5-0.7 in the minimum state and larger than 1.5 in the maximum state. Transitions in the ionization states of metals between the minimum and maximum state of LBVs, which lead to changes in the radiative acceleration due to spectral lines, are most likely responsible for such effect on the velocity law. We have also determined the geometry of the wind and found that a spherically symmetric wind model can well reproduce the observed continuum energy distributions of the five LBVs. Based on these results we suggest that the wind of LBVs be basically quasi-spherical, maybe with some clumpy structure in the spherical wind to produce some observed aspherical features. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RADIATION-DRIVEN WINDS ; EARLY-TYPE STARS ; LARGE MAGELLANIC CLOUD ; WOLF-RAYET STARS ; MASS-LOSS RATES ; S-DORADUS VARIABLES ; HR CARINAE NEBULA ; AG-CARINAE ; O-STARS ; STELLAR WIND |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/0004-637X/659/2/1563/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000245774700053 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5185]  |
| 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, China 2.Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China |
| 推荐引用方式 GB/T 7714 | Guo JH,Li Y. Estimating the structure and geometry of winds from luminous blue variables via fitting the continuum energy distributions[J]. ASTROPHYSICAL JOURNAL,2007,659(2):1563-1575. |
| APA | Guo JH,&Li Y.(2007).Estimating the structure and geometry of winds from luminous blue variables via fitting the continuum energy distributions.ASTROPHYSICAL JOURNAL,659(2),1563-1575. |
| MLA | Guo JH,et al."Estimating the structure and geometry of winds from luminous blue variables via fitting the continuum energy distributions".ASTROPHYSICAL JOURNAL 659.2(2007):1563-1575. |
入库方式： OAI收割
来源：云南天文台
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