Stellar activity in barium stars. I - Analysis of H and K CA II lines in ten barium stars | Zendy

M. Cornide | Zendy; M. J. Fernández-Figueroa | Zendy; E. de Castro | Zendy; Javier Armentia | Zendy; V. Reglero | Zendy

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Stellar activity in barium stars. I - Analysis of H and K CA II lines in ten barium stars

Author(s) -

M. Cornide,

M. J. Fernández-Figueroa,

E. de Castro,

Javier Armentia,

V. Reglero

Publication year - 1992

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/116151

Subject(s) - physics , barium , stars , astrophysics , astronomy , inorganic chemistry , chemistry

High dispersion spectra have been obtained in order to study the activity level of ten barium stars by means of the Ca II H and K emission flux, looking for a relation between barium intensity index and activity. Absolute magnitudes obtained from the Wilson-Bappu relationship disagree, in some cases, with the magnitudes computed from parallaxes, but this fact is not due to barium nature. Total emission fluxes, F(H + K) or R_HK index, plotted versus effective temperature show a distribution similar to that of cool giant stars. The asymmetry of K emission line, [F(K_2ν)/F(K_2r)], has been analyzed in relation with effective temperature, in this sense barium stars behave as expected of late-type giants with the only exception of two stars

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