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标题：Dark clouds in the vicinity of the emission nebula Sh2-205: interstellar extinction and distances
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作者：V. Straižys ; V. Straižys ; V. Čepas 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2016
卷号：590
页码：1-8
DOI：10.1051/0004-6361/201527952
语种：English
出版社：EDP Sciences
摘要：Results of CCD photometry in the seven-colour Vilnius system for 922 stars down to V = 16–17 mag and for 302 stars down to 19.5 mag are used to investigate the interstellar extinction in an area of 1.5 square degrees in the direction of the P7 and P8 clumps of the dark cloud TGU H942, which lies in the vicinity of the emission nebula Sh2-205. In addition, we used 662 red clump giants that were identified by combining the 2MASS and WISE infrared surveys. The resulting plots of extinction versus distance were compared with previous results of the distribution and radial velocities of CO clouds and with dust maps in different passbands of the IRAS and WISE orbiting observatories. A possible distance of the front edge of the nearest cloud layer at 130 ± 10 pc was found. This dust layer probably covers all the investigated area, which results in extinction of up to 1.8 mag in some directions. A second rise of the extinction seems to be present at 500–600 pc. Within this layer, the clumps P7 and P8 of the dust cloud TGU H942, the Sh2-205 emission nebula, and the infrared cluster FSR 655 are probably located. In the direction of these clouds, we identified 88 young stellar objects and a new infrared cluster.
关键词：open clusters and associations: general;stars: fundamental parameters;ISM: individual objects: TGU H942 P7;ISM: clouds;ISM: individual objects: TGU H942 P8