Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..252h&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 1, 1982, p. 252-258.
Astronomy and Astrophysics
Astrophysics
55
Giant Stars, Hertzsprung-Russell Diagram, Late Stars, Stellar Coronas, Stellar Temperature, X Ray Sources, Astronomical Observatories, G Stars, K Stars, Proportional Counters, Stellar Radiation, Stellar Spectra, Stellar Winds
Scientific paper
Soft X-ray emission was detected from Gamma Hya and 37 Com, at levels of 6-8 x 10 to the -13th ergs/sq cm per sec, during 0.2-4.0 keV observations of eight G-K giant stars obtained with the Einstein Observatory's Imaging Proportional Counter. Upper limits of about 3 x 10 to the 13th ergs/sq cm per sec were determined for the remaining stars. These results are judged to strengthen the Ayres et al (1981) findings that stellar coronae whose temperature is greater than one million K are either very weak or entirely absent among red giants and supergiants, while a large range in coronal emission exists among the yellow giant and supergiant stars.
Haisch Bernard M.
Simon Theodore
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