Mj. Fernandezfigueroa et al., CA-II H AND K AND H-ALPHA EMISSIONS IN CHROMOSPHERICALLY ACTIVE BINARY-SYSTEMS (RS-CANUM-VENATICORUM AND BY-DRACONIS), The Astrophysical journal. Supplement series, 90(1), 1994, pp. 433-465
We report high-resolution observations of the Ca II H and K and Balmer
Halpha lines in 53 chromospherically active binary systems including
the RS Canum Venaticorum binaries (RS CVn) and BY Draconis (BY Dra) cl
asses. The rotational periods of the sample cover a range from 0.8 to
83.2 days. H and K emission-line surface fluxes have been calculated f
or all the stars in the sample. In spectra where the Hepsilon line app
ears in emission, absolute surface fluxes were also determined. The Ca
II line profiles corresponding to different seasons and orbital phase
s are analyzed in order to determine the contribution of each componen
t and to study the chromospheric activity variations. We have measured
the Halpha equivalent width of the program stars and the Halpha core
emission was determined by subtraction of the equivalent width of a pr
esumably inactive star of the same spectral type and luminosity class.
Three different types of Halpha line profiles have been found: strong
emission line, weak emission line with strong superposed absorption p
rofile, and filled-in absorption line profile.