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标题：CCD Photometry of the Open Cluster Tombaugh 5 in the Vilnius System
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作者：J. Zdanavičius ; F. J. Vrba ; K. Zdanavičius 等
期刊名称：Open Astronomy
电子版ISSN：2543-6376
出版年度：2011
卷号：20
期号：1
页码：1-25
DOI：10.1515/astro-2017-0266
语种：English
出版社：Walter de Gruyter GmbH & Co. KG
摘要：AbstractWe present the results of eight-color CCD photometry of 674 stars in the direction of the open cluster Tombaugh 5 in Camelopardalis. The stars are observed in the Vilnius system supplemented by the broad-band I filter; the field is of 22’ diameter, the limiting magnitude is V =17.7 mag. The catalog contains the coordinates, V magnitudes, seven color indices, two-dimensional spectral types determined from photometric parameters, interstellar extinctions and distances. The color-magnitude diagram plotted for 480 individually dereddened stars is used to identify cluster members and to determine the distance (1.74 kpc) and age (200-250 Myr) of the cluster. The faintest cluster stars classified are of spectral class G0. The cluster contains two blue stragglers of spectral classes B2-B4, both of them seem to be visual binaries. The extinction AVfor the cluster stars is non-uniform, being spread between 2 and 3 mag, with a mean value of 2.42 mag. The extinction vs. distance dependence can be modeled by the Parenago exponential curve with two dust concentrations in the Camelopardalis dark clouds at about 150 pc and the Cam OB1 association clouds at 0.9-1.0 kpc.
关键词：Keywordsstarsfundamental parameters Galaxyopen clustersindividual (Tombaugh 5)