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A Chandra Look at the Old Open Cluster M 67

Published online by Cambridge University Press:  26 May 2016

Maureen van den Berg ,
Gianpiero Tagliafferi ,
Tomaso Belloni  and
Frank Verbunt
Maureen van den Berg
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC), Italy
Gianpiero Tagliafferi
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC), Italy
Tomaso Belloni
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC), Italy
Frank Verbunt
Affiliation:
Astronomical Institute, Utrecht University, Postbox 80 000, 3508 TA Utrecht, The Netherlands

Abstract

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We present the results of a Chandra observation of the old open cluster M 67; 25 cluster members and 13 suspected members were detected, including 22 binaries. We believe that the X-rays of most systems can be explained by enhanced activity due to rapid rotation in a tidally locked orbit. This cannot be the case for the blue and yellow stragglers with orbital periods between 40 and 5000 d, like the new source S 997. We do not understand the X-rays of these long-period binaries.

Type
Session 2 Rotation in Relation with Abundances and Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 268 - 269
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

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