Study of X-ray emission from the old open cluster, M67

Mooley, K. P. ; Singh, K. P. (2015) Study of X-ray emission from the old open cluster, M67 Monthly Notices of the Royal Astronomical Society, 452 (4). pp. 3394-3407. ISSN 0035-8711

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We present an X-ray analysis of a 4 Gyr old open cluster, M67, using archival XMM–Newton data. The aim of this study was to find new X-ray members of M67, and to use the updated member list for studying X-ray variability, and derive the X-ray luminosity functions (XLFs) of different stellar types and compare them with other star clusters of similar age. We report the detection of X-ray emission from 25 members of M67, with membership based primarily on their proper motion, of which one X-ray source is a new member. Supplementing this study with previous ROSAT and Chandra studies of M67, and using the most recent proper motion study by Vereshchagin et al., we have compiled a revised list of X-ray emitting members of M67 consisting of 43 stars. 16 of these are known RS CVn type binaries having orbital periods <10 d, and near-circular orbits, five are contact binaries with orbital periods <6 h, five are yellow and blue stragglers, two are Algol-type binaries, and one source is a cataclysmic variable. 14 members do not have any orbital information and cannot be classified. 14 of the X-ray sources detected do not have any optical counterpart down to a magnitude of V ≃ 22, and their membership is uncertain. Finally, we report the XLFs of RS CVn type and other types of stars in M67 and compare them with other open clusters of intermediate-to-old age.

Item Type:Article
Source:Copyright of this article belongs to Royal Astronomical Society.
Keywords:Stars; Activity Binaries; General Blue Stragglers Open Clusters and Associations; Individual; M67 X-rays; Binaries
ID Code:99135
Deposited On:20 Oct 2015 06:57
Last Modified:20 Oct 2015 06:57

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