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J/A+A/485/95 F-G-K stars in Blanco 1 (Mermilliod+, 2008)
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Beginning of ReadMe :J/A+A/485/95 Velocities of F-G-K stars in Blanco 1 (Mermilliod+, 2008)
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Membership, binarity, and rotation of F-G-K stars in the open cluster Blanco 1.
Mermilliod J.-C., Platais I., James D.J., Grenon M., Cargile P.A.
<Astron. Astrophys. 485, 95 (2008)>
=2008A&A...485...95M
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ADC_Keywords: Clusters, open ; Stars, dwarfs ; Photometry, UBVRI ;
Proper motions ; Radial velocities
Keywords: Galaxy: open clusters and associations: general -
Galaxy: open clusters and associations: individual: Zeta Scl -
techniques: radial velocities - techniques: photometric
Abstract:
The nearby open cluster Blanco 1 is of considerable astrophysical
interest for formation and evolution studies of open clusters because
it is the third highest Galactic latitude cluster known. It has been
observed often, but so far no definitive and comprehensive membership
determination is readily available.
An observing programme was carried out to study the stellar population
of Blanco 1, and especially the membership and binary frequency of the
F5-K0 dwarfs.
We obtained radial-velocities with the CORAVEL spectrograph in the
field of Blanco 1 for a sample of 148 F-G-K candidate stars in the
magnitude range 10<V<14. New proper motions and UBVI CCD
photometric data from two extensive surveys were obtained
independently and are used to establish reliable cluster membership
assignments in concert with radial-velocity data.
The membership of 68 stars is confirmed on the basis of proper motion,
radial velocity, and photometric criteria. Fourteen spectroscopic- and
suspected binaries (2 SB2s, 9 SB1s, 3SB?) have been discovered among
the confirmed members. Thirteen additional stars are located above the
main sequence or close to the binary ridge, with radial velocities and
proper motions supporting their membership. These are probable
binaries with wide separations. Nine binaries (7 SB1 and 2 SB2) were
detected among the field stars. The spectroscopic binary frequency
among members is 20% (14/68); however, the overall binary rate reaches
40% (27/68) if one includes the photometric binaries.
The cluster mean heliocentric radial velocity is +5.53+/-0.11km/s
based on the most reliable 49 members.
The Vsini distribution is similar to that of the Pleiades, confirming
the age similarities between the two clusters.