| Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star | |
Liu, QZ1,2; Hang, HR1; Wu GJ(吴光节)3 ; Chang, J1; Zhu, ZX1
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| 发表期刊 | ASTRONOMY & ASTROPHYSICS
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| 2000-07 | |
| 卷号 | 359期号:2页码:646-650 |
| 产权排序 | 第3完成单位 |
| 收录类别 | SCI |
| 关键词 | Stars : Binaries : Close Stars : Individual : lsi+61 Degrees 303 Stars : Emission-line X-rays : Stars Be |
| 摘要 | We present the optical spectra of the periodic radio star LSI +61 degrees 303 with intermediate dispersion. The H alpha emission line profile and its variation an analyzed. Variability in LSI +61 degrees 303 is observed on different timescales. During our observations the equivalent width (EW) of H alpha line showed long-term variability that is likely to be associated with the 4-year period. We suggest that the long-term variability is connected to the intrinsic behaviour of the Be star. The H alpha EW changed strongly around the radio maximum, clearly displayed a maximum at phases between 0.55-0.6, and possibly both another maximum at phases around 1.0 and a minimum between radio phases 0.7-0.9. The only three spectra that showed nearly equal intensities of the two peaks of H alpha emission line all occurred at radio phases around 0.8. It is interesting to note that the H alpha emission line in 1995 October showed unusual variation at radio phases around 0.6, where the decrease of the H alpha emission accompanied by the enhancement of the emission at the red wing. These short-ten and periodic phenomena can be fairly explained with the X-ray induced H alpha emission by employing the orbital solution deduced from near-infrared Light curves (Marti & Pandes 1995). Thus provides some evidence for a correlation with the orbital motion of the neutron star. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-6361 |
| URL | 查看原文 |
| 归档日期 | 2000-12-31 |
| WOS记录号 | WOS:000088587000029 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | LSI +61-DEGREES-303 ; RADIO ; VARIABILITY ; MODULATION ; PERIODICITY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/3997 |
| 专题 | 其他 |
| 通讯作者 | Liu, QZ |
| 作者单位 | 1.Purple Mountain Observatory, Nanjing 210008, P.R. China, National Astronomical Observatories, Chinese Academy of Sciences 2.Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands 3.Yunnan Observatory, P.O. Box 110, Kunming 650011, P.R. China, National Astronomical Observatories, Chinese Academy of Sciences |
| 推荐引用方式 GB/T 7714 | Liu, QZ,Hang, HR,Wu GJ,et al. Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star[J]. ASTRONOMY & ASTROPHYSICS,2000,359(2):646-650. |
| APA | Liu, QZ,Hang, HR,Wu GJ,Chang, J,&Zhu, ZX.(2000).Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star.ASTRONOMY & ASTROPHYSICS,359(2),646-650. |
| MLA | Liu, QZ,et al."Long-term optical spectral observations of the Be/X-ray binary LSI+61 degrees 303: evidence of H alpha emission associated with the neutron star".ASTRONOMY & ASTROPHYSICS 359.2(2000):646-650. |
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