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标题：High-latitude dust clouds LDN 183 and LDN 169: distances and extinctions ★
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作者：V. Straižys ; R. P. Boyle ; J. Zdanavičius 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：611
DOI：10.1051/0004-6361/201731742
语种：English
出版社：EDP Sciences
摘要：Interstellar extinction is investigated in a 2°× 2° area containing the dust and molecular clouds LDN 183 (MBM 37) and LDN 169, which are located at RA = 15h54m, Dec = − 3°. The study is based on a photometric classification in spectral and luminosity classes of 782 stars selected from the catalogs of 1299 stars down toV= 20 mag observed in the Vilnius seven-color system. For control, the MK types for the 18 brightest stars withVbetween 8.5 and 12.8 mag were determined spectroscopically. For 14 stars, located closer than 200 pc, distances were calculated from trigonometric parallaxes taken from theGaiaData Release 1. For about 70% of the observed stars, two-dimensional spectral types, interstellar extinctionsAV, and distances were determined. Using 57 stars closer than 200 pc, we estimate that the front edge of the clouds begins at 105 ± 8 pc. The extinction layer in the vicinities of the clouds can be about 20 pc thick. In the outer parts of the clouds and between the clouds, the extinction is 0.5–2.0 mag. Behind the Serpens/Libra clouds, the extinction range does not increase; this means that the dust layer at 105 pc is a single extinction source.
关键词：Key wordsenstars: fundamental parametersISM: cloudsdust, extinctionISM: individual objects: LDN 169ISM: individual objects: LDN 183 (MBM 37)