Spectroscopic study of the open cluster Blanco 1

GONZALEZ , J. F.; LEVATO H.

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Año: 2009 vol. 507 p. 541 - 547

0004-6361

Aims. As a part of our program on binaries in open clusters, we present a spectroscopic study of the bright stars of Blanco´1 aimed to detect and characterize spectroscopic binaries. detect and characterize spectroscopic binaries. As a part of our program on binaries in open clusters, we present a spectroscopic study of the bright stars of Blanco´1 aimed to detect and characterize spectroscopic binaries. Methods. Forty ve star previously mentioned as cluster candidates, plus other 24 stars in a wider region around the cluster were observed repeatedly during 6 year, with a spectral resolving power 13,300. Radial velocities were measured by cross-correlations. observed repeatedly during 6 year, with a spectral resolving power 13,300. Radial velocities were measured by cross-correlations. Forty ve star previously mentioned as cluster candidates, plus other 24 stars in a wider region around the cluster were observed repeatedly during 6 year, with a spectral resolving power 13,300. Radial velocities were measured by cross-correlations. Results. We obtained a mean cluster velocity of 6.20.3km s��1and determined kinematic membership. Eleven spectroscopic binaries were detected and orbital solutions are presented for eight of them. Six binaries are conrmed to be member of the cluster. All of them are single-lined spectroscopic systems with periods in the range 1.9.1380 days. Considering all suspected binaries, the cluter binary frequency amounts to about 50%. were detected and orbital solutions are presented for eight of them. Six binaries are conrmed to be member of the cluster. All of them are single-lined spectroscopic systems with periods in the range 1.9.1380 days. Considering all suspected binaries, the cluter binary frequency amounts to about 50%. We obtained a mean cluster velocity of 6.20.3km s��1and determined kinematic membership. Eleven spectroscopic binaries were detected and orbital solutions are presented for eight of them. Six binaries are conrmed to be member of the cluster. All of them are single-lined spectroscopic systems with periods in the range 1.9.1380 days. Considering all suspected binaries, the cluter binary frequency amounts to about 50%.