STELLAR ACTIVITY IN BARIUM STARS .1. ANALYSIS OF H-LINES AND K-LINES CA-II-LINES IN 10 BARIUM STARS

被引：6

作者：

CORNIDE, M ^{[1
]}

FERNANDEZFIGUEROA, MJ ^{[1
]}

DECASTRO, E ^{[1
]}

ARMENTIA, JA ^{[1
]}

REGLERO, V ^{[1
]}

机构：

[1] UNIV VALENCIA,DEPT MATEMAT APLICADA & ASTRON,E-45100 BURJASSOT,SPAIN

来源：

ASTRONOMICAL JOURNAL | 1992年 / 103卷 / 04期

关键词：

D O I：

10.1086/116151

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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(K2v)/F(K2r)], 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.

引用

页码：1374 / 1380

页数：7

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