Observations of the CA II infrared triplet in chromospherically active single and binary stars

Details Observations of the CA II infrared triplet in chromospherically active single and binary stars Observations of the CA II infrared triplet in chromospherically active single and binary stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...86..293d&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 86, no. 1, p. 293-306.

Astronomy and Astrophysics

Astronomy

34

Binary Stars, Chromosphere, Energy Dissipation, Infrared Astronomy, Metallicity, Stellar Spectra, Calcium, Stellar Atmospheres, Stellar Physics

Scientific paper

Spectroscopic observations of the Ca II infrared triplet (8498, 8542, 8662 A) have been obtained for 45 stars which are known or suspected to be chromospherically active. The sample includes both single and binary stars of spectral types from F2 to M5 spanning luminosity classes III, IV, and V. Several different types of activity diagnostics were measured, and their relative merits are discussed. Dependence of chromospheric emission upon rotation period, luminosity, temperature, and duplicity are analyzed. Synchronous binaries show a slight trend of increased emission with decreasing period while the asynchronous binaries show abnormally high activity levels for their rotation periods. Several stars exhibit rotationally modulated emission which is anticorrelated with the stellar brightness. Finally, estimates of chromospheric energy losses are presented with the result that the total loss in the infrared triplet is about twice that of the H and K lines.

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