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Título:
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Stellar activity in barium stars .1. Analysis of H-lines and K-lines CA-II-lines in 10 barium stars
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Autores:
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Cornide Castro-Piñeiro, Manuel ;
Fernández Figueroa, María José ;
Castro Rubio, Elisa de ;
Armentia, J. A. ;
Reglero, V.
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Tipo de documento:
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texto impreso
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Editorial:
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IOP publishing ltd, 1992-04
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Materia = Ciencias: Física: Astronomía
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Tipo = Artículo
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Resumen:
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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_2?)/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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En línea:
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https://eprints.ucm.es/id/eprint/31365/1/cornide32libre.pdf
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