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arXiv 0804.3810astro-ph
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斯隆数字巡天发现的额外超冷白矮星

Additional Ultracool White Dwarfs Found in the Sloan Digital Sky Survey

H. C. Harris, E. Gates, G. Gyuk, M. Subbarao, S. F. Anderson, P. B. Hall, J. A. Munn, J. Liebert, G. R. Knapp, D. Bizyaev, E. Malanushenko, V. Malanushenko, K. … 展开作者

H. C. Harris, E. Gates, G. Gyuk, M. Subbarao, S. F. Anderson, P. B. Hall, J. A. Munn, J. Liebert, G. R. Knapp, D. Bizyaev, E. Malanushenko, V. Malanushenko, K. Pan, D. P. Schneider, J. A. Smith

摘要:

我们在斯隆数字巡天(SDSS)中发现了七颗新的超冷白矮星。SDSS测光,光谱,自行,并提供额外的BVRI数据,这些和其他以前发现的超冷白矮星。观测到的颜色范围非常广,在性质上类似于非常冷的白矮星模型预测的颜色。其中一颗新星(SDSS J1251+44)的光谱表现出强烈的碰撞诱导吸收(CIA),而其他六颗恒星的光谱和颜色与轻度CIA一致。另一个新发现(SDSS J2239+ 00 A)是一个双星系统的一部分-它的伴星也是一颗冷白矮星,其他数据表明伴星表现出红外线通量不足,使其成为第一个由两颗CIA白矮星组成的双星系统。第三个发现(SDSS J 0310 -00)有弱的巴耳末发射线。所有七颗恒星的自行都与其在盘或厚盘中的成员身份相一致。

英文摘要:

We identify seven new ultracool white dwarfs discovered in the Sloan Digital Sky Survey (SDSS). The SDSS photometry, spectra, and proper motions are presented, and additional BVRI data are given for these and other previously discovered ultracool white dwarfs. The observed colors span a remarkably wide range, qualitatively similar to colors predicted by models for very cool white dwarfs. One of the new stars (SDSS J1251+44) exhibits strong collision-induced absorption (CIA) in its spectra, while the spectra and colors of the other six are consistent with mild CIA. Another of the new discoveries (SDSS J2239+00A) is part of a binary system -- its companion is also a cool white dwarf, and other data indicate that the companion exhibits an infrared flux deficiency, making this the first binary system composed of two CIA white dwarfs. A third discovery (SDSS J0310-00) has weak Balmer emission lines. The proper motions of all seven stars are consistent with membership in the disk or thick disk.

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