Chromospheric activity in evolved stars - The rotation-activity connection and the binary-single dichotomy

Journal Article · Wed Nov 01 00:00:00 EST 1989 · Publications of the Astronomical Society of the Pacific; (USA)

DOI:https://doi.org/10.1086/132569· OSTI ID:6997605

Young, A; Ajir, F; Thurman, G ^[1]

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1. San Diego State Univ., CA (USA)

A tabulation of measured values of the Ca II H and K (S) index are transformed to the original Mount Wilson definition of the index. The tabulation includes main-sequence, evolved, single, and tidally coupled (RS CVn) binary stars. The (S) indices are analyzed against Wilson's (1976) I(HK) intensity estimates, showing that Wilson's estimates are only a two-state indicator. Ca II H and K fluxes are computed and calibrated with published values of rotation periods. It is found that the single and binary stars are consistent with a single relationship between rotation and Ca II excess emission flux. 25 refs.

• OSTI ID: 6997605
• Journal Information: Publications of the Astronomical Society of the Pacific; (USA), Vol. 101; ISSN 0004-6280
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
STELLAR ACTIVITY
COMPILED DATA
BINARY STARS
CALCIUM
MAIN SEQUENCE STARS
ROTATION
STAR EVOLUTION
STELLAR ATMOSPHERES
STELLAR CHROMOSPHERES
ALKALINE EARTH METALS
ATMOSPHERES
DATA
ELEMENTS
INFORMATION
METALS
MOTION
NUMERICAL DATA
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources