X-ray and optical observations of HD 155638 - A remarkably active cool star

Details X-ray and optical observations of HD 155638 - A remarkably active cool star X-ray and optical observations of HD 155638 - A remarkably active cool star

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251l.105s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 251, Dec. 15, 1981, p. L105-L108.

Astronomy and Astrophysics

Astrophysics

19

Emission Spectra, Late Stars, Stellar Spectra, Stellar Spectrophotometry, Stellar Temperature, X Ray Sources, Calcium, Chromosphere, H Alpha Line, Heao 1, Heao 2, Light (Visible Radiation), Potassium, Stellar Evolution, Stellar Luminosity, Stellar Structure

Scientific paper

X-ray and optical observations of the 8.5-mag star HD 155638 are reported which reveal a remarkably active chromosphere and corona for the star. The object was first observed in soft X-rays with the HEAO 1 A2 low-energy detectors, and later reobserved with the HEAO 2 IPC. X-ray fluxes of about 2 x 10 to the -11th and 3 x 10 to the -12th ergs/sq cm per sec were obtained on the two occasions, indicative of source variability over the 2.5-year period between observations. SIT spectrographs taken in July-August 1980 show evidence of Ca II H and K core emission reversals and filled-in H alpha, while spectra taken in March and July 1981 show evidence of asymmetry and variability in the Ca II reversals. The spectral data are consistent with a G8 IV-V classification, from which is inferred a distance of 35-120 pc, and an X-ray luminosity from 4 x 10 to the 29th to 4 x 10 to the 31st ergs/sec. An absence of emission lines characteristic of mass transfer in binary systems indicates the X-rays to be coronal in origin. The properties of the star are noted to be similar to those of the RS CVn binaries.

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