A Caltech Library Service

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

Mooley, K. P. and 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.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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
Related URLs:
URLURL TypeDescription Paper
Mooley, K. P.0000-0002-2557-5180
Additional Information:© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 July 1. Received 2015 July 1. In original form 2014 December 31. First published online August 4, 2015. KM would like to thank Himali Bhatt and Dom Walton for useful discussions and guidance on X-ray data processing. We thank the anonymous referee for the valuable suggestions which greatly improved the manuscript. This research has made extensive use of Vizier, SIMBAD, and SDSS.
Subject Keywords:stars: activity; binaries: general; blue stragglers; open clusters and associations: individual: M67; X-rays: binaries
Issue or Number:4
Record Number:CaltechAUTHORS:20151002-124750695
Persistent URL:
Official Citation:K. P. Mooley and K. P. Singh Study of X-ray emission from the old open cluster, M67 MNRAS (October 01, 2015) Vol. 452 3394-3407 doi:10.1093/mnras/stv1472 First published online August 4, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60725
Deposited By: George Porter
Deposited On:02 Oct 2015 19:55
Last Modified:16 Nov 2019 00:27

Repository Staff Only: item control page