SIMBAD references

2000ApJ...542L..29F - Astrophys. J., 542, L29-L32 (2000/October-2)

Very large telescope observations of the peculiar globular cluster NGC 6712: discovery of a UV, hα-excess star in the core.

FERRARO F.R., PALTRINIERI B., PARESCE F. and DE MARCHI G.

Abstract (from CDS):

We present results from multiband observations in the central region of the cluster NGC 6712 with the ESO Very Large Telescope. Using high-resolution images we have identified three UV-excess stars. In particular, two of them are within the cluster core, a few arcseconds apart: the first object is star ``S'', which previous studies identified as the best candidate to the optical counterpart to the luminous X-ray source detected in this cluster. The other UV object shows clear-cut Hα emission and, for this reason, is an additional promising interacting binary candidate (a quiescent low-mass X-ray binary or a cataclysmic variable). The presence of two unrelated interacting binary systems a few arcseconds apart in the core of this low-density cluster is somewhat surprising and supports the hypothesis that the (internal) dynamical history of the cluster and/or the (external) interaction with the Galaxy might play a fundamental role in the formation of these peculiar objects.

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Journal keyword(s): Stars: Binaries: Close - Galaxy: Globular Clusters: Individual: NGC Number: NGC 6712 - Stars: Evolution

CDS comments: Stars 10261, 9774, 8916 from Paltrinieri = Cl* NGC 6712 PFP NNNNN. p. L30 : PG 1528, 2213 and 2331 are respectively PG 1528+062, 2213-006 and 2331+055.

Simbad objects: 10

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