The lack of binaries among hot horizontal branch stars: M80 and NGC5986

Details The lack of binaries among hot horizontal branch stars: M80 and NGC5986 The lack of binaries among hot horizontal branch stars: M80 and NGC5986

2006-06-01

arxiv.org/abs/astro-ph/0606035v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, to appear in the proceedings of the "Globular Clusters: Guides to Galaxies" conference, March 2006, Concepc

Scientific paper

10.1007/978-3-540-76961-3_11

We present preliminary results of a our search for close (period P < 10 days) binary systems among hot (Teff > 20000 K) horizontal branch stars in globular clusters M80 and NGC5986. We measured radial velocity variations of 11 targets in M80 and 5 in NGC5986, spectroscopically observed at medium resolution (R=4100) during four nights at VLT-FORS2. We found one close binary candidate in M80, showing statistically significative radial velocity variations, and no clear evidence in NGC5986. These results confirm the lack of close binaries among hot horizontal branch stars in globular clusters, as already found in NGC6752, at variance with what observed among hot subdwarfs in the field.

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