SIMBAD references

1998A&A...335..517B - Astronomy and Astrophysics, volume 335, 517-521 (1998/7-2)

Soft X-ray emission from intermediate-age open clusters: IC 4651.

BELLONI T. and TAGLIAFERRI G.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: activity - open clusters and associations: individual: IC 4651 - X-rays: stars

Nomenclature: Table 1: Cl* IC 4651 BT NN (Nos 1-25).

Simbad objects: 39

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