Stellar rotation as a controller of coronae and chromospheres of giant stars

Details Stellar rotation as a controller of coronae and chromospheres of giant stars Stellar rotation as a controller of coronae and chromospheres of giant stars

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..181g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, March 1983, p. 181-184. Research supported by the N

Other

7

Chromosphere, Giant Stars, Stellar Atmospheres, Stellar Coronas, Stellar Rotation, X Ray Stars, Angular Velocity, G Stars, Hertzsprung-Russell Diagram, K Stars, Late Stars, Radiant Flux Density, Stellar Spectrophotometry

Scientific paper

The flux of X-ray emission from F, G, and K giants drops abruptly at G5 III. This mimics the drop in rotation rates of giant seen previously. The X-ray flux, when normalized to the bolometric flux, varies as the square of the equatorial surface rotatin velocity. Lines formed in the chromospheric and transition region do not show such a close relationship with rotation, but are still correlated with it. Other H-R-diagram boundaries, such as the one for the V/R ratio for the Ca II K-line emission, appear not to be directly coupled to the stellar rotation.

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