Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..787y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 15, 1987, p. 787-795. Research supported by High Altitude Observa
Astronomy and Astrophysics
Astrophysics
8
Binary Stars, Calcium, Chromosphere, M Stars, Main Sequence Stars, Stellar Spectra, Dwarf Stars, Emission Spectra, Line Spectra, Stellar Evolution
Scientific paper
Using high-dispersion coudé spectrographs the authors have made multiple observations of 38 stars, all of which have strong emission-line core reversals in their Ca II H and K lines relative to the majority of stars of their same spectral type and luminosity class. Most of the sample stars are on the main sequence.The authors have found four possible (new) close binaries in their sample based upon detected variations of radial velocity. Comparing these results with similar studies of active stars, the authors find that duplicity may, in special circumstances, be sufficient but is not a necessary condition to generate magnetically induced chromospheric activity.
Abt Helmut A.
Mielbrecht Richard A.
Young Arthur
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