arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.1673astro-ph.SR
收藏

RAVE巡天中的单线光谱双星候选者

Single-lined Spectroscopic Binary Star Candidates in the RAVE Survey

G. Matijevic, T. Zwitter, O. Bienayme, J. Bland-Hawthorn, K. C. Freeman, G. Gilmore, E. K. Grebel, A. Helmi, U. Munari, J. F. Navarro, Q. A. Parker, W. Reid, G.… 展开作者

G. Matijevic, T. Zwitter, O. Bienayme, J. Bland-Hawthorn, K. C. Freeman, G. Gilmore, E. K. Grebel, A. Helmi, U. Munari, J. F. Navarro, Q. A. Parker, W. Reid, G. M. Seabroke, A. Siebert, A. Siviero, M. Steinmetz, F. G. Watson, M. Williams, R. F. G. Wyse

摘要:

在径向速度实验(RAVE)数据库中重复的恒星光谱观测被用来识别和检查单线双星(SB 1)的候选者。RAVE最新的内部数据库(VDR 3)包括大约25万颗不同恒星的径向速度,大气和其他参数,观测数据不少于30万。在超过20,000颗恒星的样本中,发现了1333颗具有可变径向速度的恒星。他们中的大多数人被认为是SB 1候选人。SB 1候选者在几个观测的恒星中所占的比例在10%到15%之间,这是RAVE恒星中双星的下限。由于重新观察之间的时间跨度分布偏向于相对较短的时间尺度(数天至数周),因此所识别的SB 1候选者的时间段最有可能在相同的范围内。由于RAVE的星等范围狭窄,大多数矮候选者属于薄的银河系盘,而巨星则是厚盘的一部分,距离延伸到几kpc。将SB 1候选星列表与VSX的变星目录进行比较,在巨星群中发现了几个脉动变星,其径向速度变化高达几十km/s。光谱双星轨道表(SB 9)和整个RAVE样本之间有26个匹配,其中给定的近星点时间和RAVE观测时间足够接近,可以进行可靠的比较。已知光谱双星的径向速度的RAVE测量与他们公布的径向速度曲线是一致的。

英文摘要:

Repeated spectroscopic observations of stars in the Radial Velocity Experiment (RAVE) database are used to identify and examine single-lined binary (SB1) candidates. The RAVE latest internal database (VDR3) includes radial velocities, atmospheric and other parameters for approximately quarter million of different stars with little less than 300,000 observations. In the sample of ~20,000 stars observed more than once, 1333 stars with variable radial velocities were identified. Most of them are believed to be SB1 candidates. The fraction of SB1 candidates among stars with several observations is between 10% and 15% which is the lower limit for binarity among RAVE stars. Due to the distribution of time spans between the re-observation that is biased towards relatively short timescales (days to weeks), the periods of the identified SB1 candidates are most likely in the same range. Because of the RAVE's narrow magnitude range most of the dwarf candidates belong to the thin Galactic disk while the giants are part of the thick disk with distances extending to up to a few kpc. The comparison of the list of SB1 candidates to the VSX catalog of variable stars yielded several pulsating variables among the giant population with the radial velocity variations of up to few tens of km/s. There are 26 matches between the catalog of spectroscopic binary orbits (SB9) and the whole RAVE sample for which the given periastron time and the time of RAVE observation were close enough to yield a reliable comparison. RAVE measurements of radial velocities of known spectroscopic binaries are consistent with their published radial velocity curves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑