A Search for Close Binaries in the ρ Ophiuchi Star-forming Region
A Search for Close Binaries in the ρ Ophiuchi Star-forming Region
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DOI：
10.1086/375532
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发表时间：
2003-03
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影响因子：
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通讯作者：
M. Barsony;M. Barsony;M. Barsony;C. Koresko;K. Matthews
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文献类型：
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作者：
M. Barsony;M. Barsony;M. Barsony;C. Koresko;K. Matthews
我们对附近（d = 140 pc）ρ Oph云核中的19颗年轻恒星进行了一次新的近红外散斑成像观测。四个二元和一个新发现的三元系统的结果报告。表中列出了ρ Oph主序前种群中所有已知多系统的数据。我们定义了一个限制性的二元分数Fb，r和一个限制性的伴随分数Fc，r，只计算那些在当前和以前的高分辨率近红外成像巡天中最容易探测到的系统，这些系统的分离度在0.“1和~1.”1之间，K波段的星等差ΔK < 3。对所有可用的多重性数据进行分析，得出蛇夫鱼主序前种群的Fb，r = 24% ± 11%和Fc，r = 24% ± 11%的更新值。这些值与金牛座恒星形成区的值一致，并且在1 σ水平上，Fc，r相对于主序列超出2倍。
We have carried out a new, near-infrared speckle imaging survey of 19 members of the young stellar population in the nearby (d = 140 pc) ρ Oph cloud core. Results for four binary and one newly discovered triple system are reported. Data for all known multiple systems among the pre-main-sequence population of ρ Oph are tabulated. We define a restricted binary fraction, Fb,r, and a restricted companion fraction, Fc,r, as counting only those systems most detectable in the present and previous high-resolution near-infrared imaging surveys having separations between 0.″1 and ~1.″1 and K-band magnitude differences ΔK < 3. Analysis of all the available multiplicity data results in updated values of Fb,r = 24% ± 11% and Fc,r = 24% ± 11% for the Ophiuchus pre-main-sequence population. These values are consistent with the values in the Taurus star-forming region, and Fc,r is in excess by a factor of 2 relative to the main sequence at the 1 σ level.