SIMBAD references

1998A&A...339..431B - Astronomy and Astrophysics, volume 339, 431-439 (1998/11-2)

X-rays from old open clusters: M 67 and NGC 188.


Abstract (from CDS):

We have observed the old open clusters M67 and NGC188 with the ROSAT PSPC. In M67 we detect a variety of X-ray sources. The X-ray emission by a cataclysmic variable, a single hot white dwarf, two contact binaries, and some RS CVn systems is as expected. The X-ray emission by two binaries located below the subgiant branch in the Hertzsprung Russell diagram of the cluster, by a circular binary with a cool white dwarf, and by two eccentric binaries with Pb>700d is puzzling. Two members of NGC188 are detected, including the FKCom type star D719. Another possible FKCom type star, probably not a member of NGC188, is also detected.

Abstract Copyright:

Journal keyword(s): stars: abundances - open clusters: individual: M 67, NGC 188 - X-rays: stars

Nomenclature: Table 1: [BVM98] M 67 NN N=59, (Nos 1-4, 6-19, 21-61). Table 2: <%M [BVM98] NGC 188 NN (Nos 1-34).

Errata: Erratum vol. 351, p. 398 (1999)

Simbad objects: 107

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