Star counts and visual extinctions in dark nebulae.
Star counts and visual extinctions in dark nebulae.
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暗星云中的恒星计数和视觉消光。
DOI：
10.1086/112212
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
R. Dickman
中科院分区：
文献类型：
--
作者：
R. Dickman
讨论了星数技术在确定致密、相当高消光暗星云的视消光中的应用。特别注意对总消光与选择性消光之比可能异常的云的目视消光的测定。所讨论的技术在四个著名的致密尘埃云或博克球状体上的两种颜色的应用：Barnard 92， b133， b134和b335。给出了这些天体的最小质量和中心消光的下限。
Application of star count techniques to the determination of visual extinctions in compact, fairly high-extinction dark nebulae is discussed. Particular attention is devoted to the determination of visual extinctions for a cloud having a possibly anomalous ratio of total to selective extinction. The techniques discussed are illustrated in application at two colors to four well-known compact dust clouds or Bok globules: Barnard 92, B 133, B 134, and B 335. Minimum masses and lower limits to the central extinction of these objects are presented.