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arXiv 1506.04748astro-ph.SR
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用LAMOST DR3对白矮星候选者光度选择的独立检验

An independent test of the photometric selection of white dwarf candidates using LAMOST DR3

N. P. Gentile Fusillo, A. Rebassa-Mansergas, B. T. Gänsicke, X. -W. Liu, J. J. Ren, D. Koester, Y. Zhan, Y. Hou, Y. Wang, M. Yang

摘要:

在Gentile Fusillo等人(2015)中,我们开发了一种选择白矮星候选者的方法,该方法利用测光,颜色和自行来计算成为白矮星(Pwd)的概率。我们的方法的应用斯隆数字巡天(SDSS)数据发布10导致近66,000光度选择的对象与派生PWD,其中约21000是高置信度的白矮星候选人。在这里,我们提出了一个独立的测试,我们的选择方法的基础上,从LAMOST(大天区多光纤光谱望远镜)调查光谱确认的白矮星的样本。我们通过交叉匹配我们所有的$\sim$ 66,000 SDSS光度白矮星候选者与LAMOST第三次数据发布中提供的400多万光谱来做到这一点。这导致了1673颗白矮星候选者没有先前的SDSS光谱,但有可用的LAMOST光谱。在这些天体中,我们确定了309颗真正的白矮星。我们发现,我们的Pwd可以有效地区分确认LAMOST白矮星和污染物。我们的白矮星候选选择方法可以应用于任何多波段光度测量,在这项工作中,我们最终确认其可靠性选择白矮星,而不求助于光谱。我们还讨论了LAMOST中白矮星的光谱完整性,以及推导出新发现的LAMOST样品中富氢大气白矮星的有效温度、表面重力和质量。

英文摘要:

In Gentile Fusillo et al. (2015) we developed a selection method for white dwarf candidates which makes use of photometry, colours and proper motions to calculate a probability of being a white dwarf (Pwd). The application of our method to the Sloan Digital Sky Survey (SDSS) data release 10 resulted in nearly 66,000 photometrically selected objects with a derived Pwd, approximately 21000 of which are high confidence white dwarf candidates. Here we present an independent test of our selection method based on a sample of spectroscopically confirmed white dwarfs from the LAMOST (Large Sky Area Multi-Fiber Spectroscopic Telescope) survey. We do this by cross matching all our $\sim$66,000 SDSS photometric white dwarf candidates with the over 4 million spectra available in the third data release of LAMOST. This results in 1673 white dwarf candidates with no previous SDSS spectroscopy, but with available LAMOST spectra. Among these objects we identify 309 genuine white dwarfs. We find that our Pwd can efficiently discriminate between confirmed LAMOST white dwarfs and contaminants. Our white dwarf candidate selection method can be applied to any multi-band photometric survey and in this work we conclusively confirm its reliability in selecting white dwarfs without recourse to spectroscopy. We also discuss the spectroscopic completeness of white dwarfs in LAMOST, as well as deriving effective temperatures, surface gravities and masses for the hydrogen-rich atmosphere white dwarfs in the newly identified LAMOST sample.

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