RT Journal Article
T1 Stellar activity in barium stars .1. Analysis of H-lines and K-lines CA-II-lines in 10 barium stars
A1 Cornide Castro-Piñeiro, Manuel
A1 Fernández Figueroa, María José
A1 Castro Rubio, Elisa De
A1 Armentia, J. A.
A1 Reglero, V.
AB 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.
PB IOP Publishing ltd
SN 0004-6256
YR 1992
FD 1992-04
LK https://hdl.handle.net/20.500.14352/59665
UL https://hdl.handle.net/20.500.14352/59665
LA eng
NO © 1992. American Astronomical Society.The 2.2 m telescope at Calar Alto Observatory is operated by the Max-Planck Institut für Astronomie at the Centro Astronómico Hispano-Alemán. We want to express our gratitude to the staff of the Observatory for their help during the observational campaign. This work has been supported by the Spanish Comisión Interministerial de Ciencia y Tecnología.
NO Comisión Interministerial de Ciencia y Tecnología (CICYT), España
NO Ministerio de Ciencia e Innovación (MICINN), España
DS Docta Complutense
RD 10 abr 2025