Chromospherically active binaries, kinematics and age connections

Details Chromospherically active binaries, kinematics and age connections Chromospherically active binaries, kinematics and age connections

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170..161e&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

Binary Stars, Chromosphere, Stellar Activity, Stellar Evolution, Stellar Motions, Giant Stars, Irregular Variable Stars, Main Sequence Stars, Subgiant Stars

Scientific paper

Space velocities of 146 chromospherically active binary stars have been calculated. Containing F to M spectral types on the Main Sequence together with G and K giants, this very heterogeneous sample has been divided into subsamples in order to segregate stars so that they have similar kinematics and ages. Systems containing subgiants or double-lined giants as their companions have ages about 2-3 billion yr. Single-lined giants appear to be older than intermediate disk population stars. The possible existence of white dwarfs as invisible companions of some of the single-lined giants is suggested in order to explain why these systems are older than double-lined giants.

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