Chromospheric CA II H and K and H-alpha emission in single and binary stars of spectral types F6-M2

Details Chromospheric CA II H and K and H-alpha emission in single and binary stars of spectral types F6-M2 Chromospheric CA II H and K and H-alpha emission in single and binary stars of spectral types F6-M2

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72..191s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, Jan. 1990, p. 191-230. Research supported by BMFWF.

Astronomy and Astrophysics

Astrophysics

169

Chromosphere, Emission Spectra, Late Stars, Stellar Activity, Stellar Rotation, Stellar Spectra, Calcium, H Alpha Line, Hydrogen, Potassium, Spectral Resolution

Scientific paper

New observations of the Ca II H and K and H-epsilon region and/or the Balmer H-alpha line are presented for 100 mostly very active stars but also for weak or inactive stars with suspected activity. Correlations between chromospheric activity at Ca II H and K and H-alpha and effective surface temperature and rotation are identified, and several new stars with chromospheric Ca II H and K emission are discovered. No single activity-rotation relation can be derived for all luminosity classes, and there is clear evidence that evolved stars are generally more active than main-sequence stars of the same rotation period. Binary within the evolved stars appears to play no role, while main-sequence binary stars show generally higher levels of activity than their single counterparts. Chromospheric emission in the Ca II H and K lines depends on surface temperature in that flux declines with cooler temperature.

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