Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-06
Astronomy and Astrophysics
Astrophysics
Accepted for publications in Astronomy and Astrophysics; 6 pages, including 1 figure
Scientific paper
We present the results of soft X-ray observations of the intermediate-age open cluster IC 4651 performed with the ROSAT PSPC. We detected 25 sources. Two are identified with a giant binary and a blue straggler respectively, both belonging to the cluster, and two with probable main-sequence members. Two other cases have ambiguous identification. Of the five binaries known in the cluster, the one detected in X rays is the only one whose period is short enough to maintain fast rotation and therefore strong stellar activity at a high age. The detected blue straggler is probably binary, suggesting that binarity is the key to producing a high level of X-ray emission. It is the third blue straggler detected in X rays. The remaining sources need to be identified through optical follow-up.
Belloni Tomaso
Tagliaferri Giampiero
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