SDSS DR8光谱档案中的易碎二元候选物
Fragile Binary Candidates in the SDSS DR8 spectroscopic archive
摘要：
我们提出了一个目录的80个非常广泛的脆弱的二进制候选人（预计分离> 10000 AU）从SDSS DR 8光谱档案。这些对是根据自行、径向速度、金属丰度和光度视差标准选择的。这些对的角间距范围从3”到250”。这些对的金属丰度分布的峰值约为太阳金属丰度的-0.5倍。空间运动和约化自行图表明所有这些对都是盘的成员。测量了38个高信噪比候选双星和3个疏散星团（NGC 2420、M67和NGC 6791）成员星的色球活动指数SHK。这些候选双星的SHK与颜色的关系与这些疏散星团中看到的趋势一致。这种关系所暗示的年龄表明，脆弱的宽对可以生存超过8 Gyr。
英文摘要：
We present a catalog of 80 very wide fragile binary candidates (projected separations > 10000 AU) from the SDSS DR8 spectral archive. The pairs were selected based on proper motion, radial velocity, metallicity and photometric parallax criteria. The angular separations of these pairs range from 3" to 250". The peak in the metallicity distribution of these pairs is about -0.5 dex of solar metallicity. Space motions and reduced proper motion diagrams indicate all these pairs are members of the disk. The chromospheric activity index SHK of each component in 38 binary candidates having spectra of high signal-to-noise ratio and member stars of three open clusters (NGC2420, M67 and NGC6791) were measured. The SHK vs. color relation for these binary candidates is consistent with the trend seen in these open clusters. The ages implied by this relation suggest that fragile wide pairs can survive longer than 8 Gyr.
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