Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..253m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 253-278. Research supported by the Lockheed Independe
Astronomy and Astrophysics
Astronomy
83
Giant Stars, Heao 2, Late Stars, Sky Surveys (Astronomy), Supergiant Stars, X Ray Astronomy, Binary Stars, Stellar Evolution, Stellar Luminosity, Stellar Magnitude, Stellar Radiation
Scientific paper
Results are presented of an extensive X-ray survey of 380 giant and supergiant stars of spectral types from F to M, carried out with the Einstein Observatory. It was found that the observed F giants or subgiants (slightly evolved stars with a mass M less than about 2 solar masses) are X-ray emitters at the same level of main-sequence stars of similar spectral type. The G giants show a range of emissions more than 3 orders of magnitude wide; some single G giants exist with X-ray luminosities comparable to RS CVn systems, while some nearby large G giants have upper limits on the X-ray emission below typical solar values. The K giants have an observed X-ray emission level significantly lower than F and F giants. None of the 29 M giants were detected, except for one spectroscopic binary.
Bookbinder Jay
Haisch Bernard M.
Harnden Frank R. Jr.
Maggio Antonio
Rosner Robert
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