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

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dc.creatorBelloni, T.
dc.creatorVerbunt, F.
dc.creatorMathieu, R. D.
dc.date1998-08-28
dc.date.accessioned2026-07-07T02:27:45Z
dc.date.available2026-07-07T02:27:45Z
dc.descriptionWe have observed the old open clusters M 67 and NGC 188 with the ROSAT PSPC. In M 67 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 orbital period > 700 d is puzzling. Two members of NGC 188 are detected, including the FK Com type star D719. Another possible FK Com type star, probably not a member of NGC 188, is also detected.
dc.description10 pages, 5 figures. Accepted for publication on Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9808329
dc.identifierhttp://arxiv.org/abs/astro-ph/9808329
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12828
dc.subjectAstrophysics
dc.titleX rays from old open clusters: M 67 and NGC 188
dc.typetext

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