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Title:
The Lack of Binaries Among Hot Horizontal Branch Stars: M80 and NGC5986
Authors:
Moni Bidin, C.; Moehler, S.; Piotto, G.; Momany, Y.; Recio-Blanco, A.; Méndez, R. A.
Affiliation:
AA(Departamento de Astronomía, Universidad de Chile), AB(European Southern Observatory), AC(Dipartimento di Astronomia, Università di Padova), AD(Dipartimento di Astronomia, Università di Padova), AE(Dpt. Cassiopée, Observatoire de la Côte d'Azur), AF(Departamento de Astronomía, Universidad de Chile)
Publication:
Globular Clusters - Guides to Galaxies, Eso Astrophysics Symposia, Volume . ISBN 978-3-540-76960-6. Springer Berlin Heidelberg, 2009, p. 37
Publication Date:
00/2009
Origin:
SPRINGER
DOI:
10.1007/978-3-540-76961-3_11
Bibliographic Code:
2009gcgg.book...37M

Abstract

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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