Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..273b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 273-285. Research sponsored by the U.S.-Australian B
Astronomy and Astrophysics
Astrophysics
10
Emission Spectra, Heao 1, Stellar Activity, X Ray Binaries, Chromosphere, Radial Velocity, Stellar Luminosity, Stellar Models, Stellar Spectra, Variable Stars
Scientific paper
The authors report the identification of three high galactic latitude X-ray sources, detected by the HEAO 1 MC experiment, with the bright stars HD 113816, HD 146413 (= ADS 9982) and HD 39576. The authors have found all three stars to be chromospherically active by virtue of their Ca II emission strength. The latter two stars exhibit variable X-ray emission in the 1 - 13 keV energy range, while HD 113816 is a softer (0.9 - 2.5 keV) and steadier source. The optical spectroscopic observations reveal small radial velocity variations over months for HD 113816 and insignificant variations for HD 146413. The level of X-ray flux detected from these three stars is some one to two orders of magnitude higher than predicted empirically from the Ca II emission fluxes. It is proposed that the X-ray emission results from flarelike activity.
Bradt Hale V.
Buckley David A. H.
Remillard Ron A.
Schwartz Dana A.
Tuohy Ian R.
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