Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..232s&link_type=abstract
Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 232-238.
Astronomy and Astrophysics
Astronomy
16
Binary Stars, Chromosphere, Stellar Rotation, Ultraviolet Astronomy, X Ray Sources, Emission Spectra, G Stars, Heao 2, Iue, Stellar Luminosity, Variable Stars
Scientific paper
X-ray and ultraviolet observations of the spectroscopic and visual binary HD 165590 are presented. Results show that the spectroscopic binary component has a period of 0.88 day and a near-solar spectral type. A substantial soft X-ray flux for HD 165590 is also found with an X-ray luminosity of 10 to the 30.6th ergs/sec for the system. No obvious periodicities of less than 0.5 days are detected in the X-ray data, although stochastic variability is present. Observations of the transition region emission lines using the International Ultraviolet Explorer satellites are shown to be consistent with the X-ray data and reveal an approximately 50% variability on the time scale of days. It is concluded that comparisons of the results for HD 165590 with X-ray observations of other late F and G stars demonstrate that rotation-activity scaling relations are useful as gross predictors of X-ray emission.
Skumanich Andrew
Stern Robert A.
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