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HD 6258


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Chromospheric activity and stellar evolution - Clues from IUE data
We investigate the dependence of chromospheric activity on stellarphysical parameters in a sample of cool giants and supergiants. Ca IIsurface fluxes for stars of known masses and evolutionary status arederived from published IUE Mg II observations. Adding these data to thesample of Pasquini et al. (1990) we find that chromospheric activity inevolved stars is better described by two stellar parameters, and a tightrelationship is found between activity, stellar Teff and Mass. Wediscuss this relationship arguing that the stellar evolutionary statuscould play a 'hidden' but fundamental role in determining the activitylevel of evolved late type stars.

Determinations of the Parallaxes of Barnard's Star BD-70DEG68 and BD-4DEG4157
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观测天体数据

星座:仙后座
右阿森松:01h05m31.28s
赤纬:+72°11'52.6"
视星:9.209
右阿森松适当运动:16.1
赤纬适当运动:-21.1
B-T magnitude:9.756
V-T magnitude:9.255

目录:
适当名称   (Edit)
HD 1989HD 6258
TYCHO-2 2000TYC 4304-1788-1
USNO-A2.0USNO-A2 1575-00668251
HIPHIP 5113

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