Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...79..481e&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 79, no. 2, April 1992, p. 481-505. Research supported by Scientif
Astronomy and Astrophysics
Astrophysics
18
Binary Stars, Giant Stars, Main Sequence Stars, Stellar Evolution, Chromosphere, Stellar Mass, Stellar Orbits
Scientific paper
Space velocities of 146 chromospherically active binary stars have been calculated. Containing F-M spectral types on the main sequence together with G and K giants and subgiants, this very heterogeneous sample has been divided into groups in order to segregate stars which have similar kinematics and ages. After many trials for different criteria, the sample was divided into five groups - two groups for giants, two groups for main-sequence systems, and one group for main-sequence systems. Kinematics of subgiants implies a stellar age of about 2-3 Gyr. Young and old groups of giants and main-sequence systems could be characterized by a kinematical age of about 1 Gyr and more than 5 Gyr, respectively. These ages are estimated approximately according to space velocity distributions and dispersions in velocity space in each group. Inferred ages for the groups above agrees with circulation, rotation activity relation, and stellar evolution theories.
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