Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..295m&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. 295-298.
Astronomy and Astrophysics
Astrophysics
18
Binary Stars, Cool Stars, K Lines, Main Sequence Stars, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Rotation, Stellar Temperature, Astronomical Spectroscopy, Chromosphere, Late Stars, Line Spectra
Scientific paper
Ca II H and K fluxes were measured in 31 rapidly rotating main-sequence stars of type F and in seven single-line main-sequence spectroscopic binaries with periods less than 10 days. Most of the rapidly rotating stars observed appear to have relatively high fluxes compared to the slowly rotating stars of the same spectral type. Calculations show that the effect of rotational broadening is negligible and that the fluxes greater than normal measured in these stars must be a result of the increased Ca II H and K emission. All main-sequence binaries with periods less than nine days show eccentricities smaller than 0.1, which indicates that in these systems the rotational and orbital motions are probably synchronized.
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