Optical spectroscopy of the be/x-ray binary v850 centauri/gx 304-1 during faint x-ray periodical activity
文献类型：期刊论文
| 作者 | Malacaria, C.1; Kollatschny, W.2; Whelan, E.3; Santangelo, A.1,4; Klochkov, D.1; McBride, V.5,6; Ducci, L.1,7 |
| 刊名 | Astronomy & astrophysics
 |
| 出版日期 | 2017-07-01 |
| 卷号 | 603页码:7 |
| ISSN号 | 1432-0746 |
| 关键词 | Stars: individual: v850 cen Stars: individual: gx 304-1 Stars: emission-line, be Stars: neutron X-rays: binaries |
| DOI | 10.1051/0004-6361/201730538 |
| 通讯作者 | Malacaria, c.(malacaria@astro.uni-tuebingen.de) |
| 英文摘要 | Context. be/x-ray binaries (bexrbs) are the most populous class of high-mass x-ray binaries. their x-ray duty cycle is tightly related to the optical companion wind activity, which in turn can be studied through dedicated optical spectroscopic observations. aims. we study optical spectral features of the be circumstellar disk to test their long-term variability and their relation with the x-ray activity. special attention has been given to the h alpha emission line, one of the best tracers of the disk conditions. methods. we obtained optical broadband medium resolution spectra from a dedicated campaign with the anglo-australian telescope and the southern african large telescope in 2014-2015. data span over one entire binary orbit, and cover both x-ray quiescent and moderately active periods. we used balmer emission lines to follow the evolution of the circumstellar disk. results. we observe prominent spectral features, like double-peaked h alpha and h beta emission lines. the h alpha v/r ratio significantly changes over a timescale of about one year. our observations are consistent with a system observed at a large inclination angle (i greater than or similar to 60 degrees). the derived circumstellar disk size shows that the disk evolves from a configuration that prevents accretion onto the neutron star, to one that allows only moderate accretion. this is in agreement with the contemporary observed x-ray activity. our results are interpreted within the context of inefficient tidal truncation of the circumstellar disk, as expected for this source's binary configuration. we derived the h beta-emitting region size, which is equal to about half of the corresponding h alpha-emitting disk, and constrain the luminosity class of v850 cen as iii-v, consistent with the previously proposed class. |
| WOS关键词 | SMALL-MAGELLANIC-CLOUD ; PULSAR GX 304-1 ; H-ALPHA ; LONG-TERM ; ROTATIONAL VELOCITIES ; DISK OSCILLATIONS ; STAR ENVELOPES ; LINE FORMATION ; SHELL STARS ; OUTBURSTS |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:000406619100109 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2176932 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Malacaria, C. |
| 作者单位 | 1.Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany 2.Univ Gottingen, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany 3.Maynooth Univ, Natl Univ Ireland Maynooth, Dept Expt Phys, Maynooth Co, Kildare, Ireland 4.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 5.Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa 6.South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa 7.Univ Geneva, ISDC Data Ctr Astrophys, 16 Chemin Ecogia, CH-1290 Versoix, Switzerland |
| 推荐引用方式 GB/T 7714 | Malacaria, C.,Kollatschny, W.,Whelan, E.,et al. Optical spectroscopy of the be/x-ray binary v850 centauri/gx 304-1 during faint x-ray periodical activity[J]. Astronomy & astrophysics,2017,603:7. |
| APA | Malacaria, C..,Kollatschny, W..,Whelan, E..,Santangelo, A..,Klochkov, D..,...&Ducci, L..(2017).Optical spectroscopy of the be/x-ray binary v850 centauri/gx 304-1 during faint x-ray periodical activity.Astronomy & astrophysics,603,7. |
| MLA | Malacaria, C.,et al."Optical spectroscopy of the be/x-ray binary v850 centauri/gx 304-1 during faint x-ray periodical activity".Astronomy & astrophysics 603(2017):7. |
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