arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.01896astro-ph.SR
收藏

俯瞰附近F星的广泛同伴

Overlooked wide companions of nearby F stars

Ralf-Dieter Scholz

摘要:

目的:我们使用现有的近红外和光学巡天技术,在50 pc范围内检查了545颗F星的样本。方法:采用正交设计法应用共同自行(CPM)的标准,我们发现了广泛的同伴候选人与6-120角秒角分离的多历元取景器图表的视觉检查和搜索自行目录。最后自行涉及的位置测量测量,从多达11个调查。光谱类型的红色CPM同伴估计从他们的绝对$J$带幅度的基础上的依巴谷距离的原色。结果:除了大约100个已知的CPM对象,我们发现了19个新的CPM同伴,并确认了31个先前已知的候选者。一些CPM对象仍然被认为是根据其自行协议的水平的候选人。在这些新发现的天体中,有9颗M0-M4,8颗M5-M6,1颗$\approx$ L3.5矮星(HD 3861 B)和1颗白矮星(WD)(HD 2726 B),而我们确认了2颗K,19颗M0-M4,6颗M5-M6,2颗早期L矮星和2颗DA WD是CPM伴星。在少数情况下,以前的光谱类型都与我们的估计吻合得很好。两颗伴星HD 22879 B和HD 49933 B与中度贫金属的盖亚基准星有关。其中一颗疑似的CPM伴星,在光谱上被归类为WD,但被其他人发现非常明亮($J$ $=$ 11.1),应该是非常接近的前景WD,或是与HD 165670有关的另一种天体。

英文摘要:

AIMS: We checked a sample of 545 F stars within 50 pc for wide companions using existing near-infrared and optical sky surveys. METHODS: Applying the common proper motion (CPM) criterion, we detected wide companion candidates with 6-120 arcsec angular separations by visual inspection of multi-epoch finder charts and by searching in proper motion catalogues. Final proper motions were measured by involving positional measurements from up to eleven surveys. Spectral types of red CPM companions were estimated from their absolute $J$-band magnitudes based on the Hipparcos distances of the primaries. RESULTS: In addition to about 100 known CPM objects, we found 19 new CPM companions and confirmed 31 previously known candidates. A few CPM objects are still considered as candidates according to their level of proper motion agreement. Among the new objects there are nine M0-M4, eight M5-M6, one $\approx$L3.5 dwarf (HD 3861B), and one white dwarf (WD) (HD 2726B), whereas we confirmed two K, 19 M0-M4, six M5-M6, two early-L dwarfs, and two DA WDs as CPM companions. In a few cases, previous spectral types were available that all agree well with our estimates. Two companions (HD 22879B and HD 49933B) are associated with moderately metal-poor Gaia benchmark stars. One doubtful CPM companion, spectroscopically classified as WD but found to be very bright ($J$$=$11.1) by others, should either be a very nearby foreground WD or a different kind of object associated with HD 165670.

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。

↑