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STELLAR ROTATION AS A CONTROLLER OF CORONAE AND CHROMOSPHERES OF GIANT STARS

DAVID F. GRAY
Publications of the Astronomical Society of the Pacific
Vol. 95, No. 565 (March 1983), pp. 181-184
Stable URL: http://www.jstor.org/stable/40678141
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
STELLAR ROTATION AS A CONTROLLER OF CORONAE AND CHROMOSPHERES OF GIANT STARS
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Abstract

The flux of X-ray emission from F, G, and giants drops abruptly at G5 III. This mimics the drop in rotation rates of giants seen previously. The X-ray flux, when normalized to the bolometric flux, varies as the square of the equatorial surface rotation 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 Kline emission, appear not to be directly coupled to the stellar rotation.

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