Disappearance of coronal X-ray emission in stars with cool dense winds

Details Disappearance of coronal X-ray emission in stars with cool dense winds Disappearance of coronal X-ray emission in stars with cool dense winds

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.360..239h&link_type=abstract

Nature (ISSN 0028-0836), vol. 360, no. 6401, p. 239-241.

Physics

40

Cosmic X Rays, Stellar Activity, Stellar Coronas, Stellar Radiation, Stellar Winds, X Ray Sources, Hertzsprung-Russell Diagram, K Stars, Red Giant Stars, Rosat Mission, Stellar Evolution, X Ray Absorption

Scientific paper

X-ray observations have shown that stellar coronae seem to disappear abruptly across a 'dividing line' in the H-R diagram describing the evolution of intermediate-mass stars toward the red giant phase. Results from the Rosat all-sky survey are used here to show that the dividing line is not an artifact of poor sampling. Optical and UV observation show that the dividing line in the H-R diagram coincides approximately with the onset of cool massive stellar winds, but it is shown here that these winds are not sufficiently dense for simple X-ray absorption to be the cause of the disappearance of coronal emission. It is concluded that the dividing line represents a true evolutionary transition in these stars at which the hot coronae are replaced by cool winds.

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