Other
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..377b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 377-388. Research supported by the International Ultra
Other
74
Binary Stars, Chromosphere, Cool Stars, Stellar Activity, Stellar Atmospheres, Dwarf Stars, Iue, Stellar Gravitation, Stellar Luminosity, Stellar Orbits, Stellar Rotation
Scientific paper
The interdependences between various measures of activity and a number of relevant stellar parameters are explored for a sample of largely post-main-sequence, late-type binaries with orbital periods from one to 100 days. This paper examines the relations between diagnostics formed at various heights in the atmospheres, and between activity and stellar parameters expected to have a bearing on the level of activity. The stars are compared with single dwarfs having similar periods. It is found that the binaries closely resemble the single stars in the way the various activity diagnostics are related to each other. The primary dependence of activity is confirmed to be on stellar rotation. Tidal coupling is ruled out as a direct factor for increasing activity in binaries. The binaries and single stars exhibit similar and clear dependences of activity on either their rotation periods or Rossby numbers.
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