Stellar X-ray emission in old and intermediate age open clusters
Abstract
Chandra ACIS-I 46 ksec observation of M67 led to the detection of more than 150 sources. We identified 25 sources with cluster members and obtained the optical magnitude for a total of 64 Chandra sources. Most of the identified members are binaries. Some are rapidly rotating stars that are the product of a merger. These objects are X-ray sources because of a very specific type of binary evolution, and by studying these special systems in optical follow-up we can study little-understood details of stellar evolution and of binary evolution. Eleven Chandra sources have been detected with more than 200 counts, allowing some spectral analysis beyond the production of simple X-ray colors. We recently observed with XMM-Newtob also the intermediate age open cluster NGC2527, but we have not received the data, yet. We will present the results of the spatial, spectral and timing analysis of the Chandra M67 observation and possibly of the XMM-Newton NGC2527 observation.
- Publication:
-
34th COSPAR Scientific Assembly
- Pub Date:
- 2002
- Bibcode:
- 2002cosp...34E.786T