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arXiv 0709.2190astro-ph
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Sloan数字巡天光谱中的白矮星光度和质量函数

White Dwarf Luminosity and Mass Functions from Sloan Digital Sky Survey Spectra

Steven DeGennaro, Ted von Hippel, D. E. Winget, S. O. Kepler, Atsuko Nitta, Detlev Koester, Leandro Althaus

摘要:

我们目前的第一阶段,在我们正在进行的工作,使用斯隆数字巡天(SDSS)的数据,以创建单独的白矮星(WD)的光度函数为两个或两个以上的不同质量范围。在本文中,我们确定的SDSS光谱白矮星样品的完整性进行比较,自行选择样品的WD从SDSS成像数据与光谱测定WD的大目录。我们推导出选择概率作为单一颜色(g-i)和表观幅度(g)的函数,其覆盖范围为-1.0 < g-i < 0.2和15 < g < 19.5。我们解决所观察到的上升日志g的白矮星与Teff <~ 12,000 K,并提供参数,该问题是有限的线轮廓,并不存在于连续。我们提供了一个经验方法,消除了上翘,恢复一个合理的质量函数的白矮星与Teff <12,000 K。最后,我们提出了一个白矮星光度函数与近一个数量级(3,358)光谱证实的白矮星比以前的任何工作。

英文摘要:

We present the first phase in our ongoing work to use Sloan Digital Sky Survey (SDSS) data to create separate white dwarf (WD) luminosity functions for two or more different mass ranges. In this paper, we determine the completeness of the SDSS spectroscopic white dwarf sample by comparing a proper-motion selected sample of WDs from SDSS imaging data with a large catalog of spectroscopically determined WDs. We derive a selection probability as a function of a single color (g-i) and apparent magnitude (g) that covers the range -1.0 < g-i < 0.2 and 15 < g < 19.5. We address the observed upturn in log g for white dwarfs with Teff <~ 12,000K and offer arguments that the problem is limited to the line profiles and is not present in the continuum. We offer an empirical method of removing the upturn, recovering a reasonable mass function for white dwarfs with Teff < 12,000K. Finally, we present a white dwarf luminosity function with nearly an order of magnitude (3,358) more spectroscopically confirmed white dwarfs than any previous work.

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