Binary frequency in the open clusters NGC 6025 and Blanco 1

Details Binary frequency in the open clusters NGC 6025 and Blanco 1 Binary frequency in the open clusters NGC 6025 and Blanco 1

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26q.171g&link_type=abstract

XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S

Astronomy and Astrophysics

Astronomy

Scientific paper

This work is part of an ongoing program aimed at determining the binary frequency and the properties of the binary star population in southern open clusters.The goal of the project is to provide statistical data essential for clarifying the role played by binaries and multiple stars in the evolution of open clusters.
We present here the results of a spectroscopic study of the open clusters NGC 6025 and Blanco 1. Repeated observations for 78 stars in these two clusters were obtained throughout 5 years with the 2.1-m telescope and the echelle spectrograph REOSC at the CASLEO. We measured radial velocities and determined kinematic memberships. We obtained for the mean velocities of the clusters NGC 6025 and Blanco 1 6.8+/-0.2/s and 11.1+/-0.3/s, respectively.
In the cluster NGC 6025 we detected 2 double lined spectroscopic binaries, one of which is not a cluster member according to its center-of-mass velocity. In addition, eight stars are radial velocity variables or show spectral lines with variable or asymmetrical profiles. These objects are candidates to be binaries with components of similar spectral types and high rotational velocity. Some of them, however, might be spotted rotating stars or pulsating stars. In Blanco 1 we detected eight single-lined binary stars and calculated the orbit for six of them. NGC 6025 presents a high binary frequency, probably over 40-50 percent, while in Blanco 1 the spectroscopic binary fraction is about 25 percent.

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