Identification of the soft X-ray source H1011-47 (= E1013-477) - A new magnetic variable

Details Identification of the soft X-ray source H1011-47 (= E1013-477) - A new magnetic variable Identification of the soft X-ray source H1011-47 (= E1013-477) - A new magnetic variable

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..370m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, June 1983, p. 370-375. Research supported by the Sc

Astronomy and Astrophysics

Astronomy

10

Magnetic Stars, Spaceborne Astronomy, Variable Stars, X Ray Sources, Emission Spectra, Heao 2, Line Spectra, Stellar Magnitude, Ultraviolet Astronomy

Scientific paper

A variable blue emission-line star is determined to be the probable counterpart of the HEAO-1 soft X-ray source H1011-47 on the basis of an improved position derived with the Einstein satellite. The star is found to vary between magnitudes of 16.7 and 17.7 on a time scale of approximately 100 minutes and by as much as 0.6 magnitude on a time scale of a few minutes. The spectrum shows strong, broad optical emission lines of hydrogen, He I, He II, and Ca II and strong ultraviolet emission lines of C IV and Si IV. These characteristics indicate that the star most probably belongs to the AM Her class of magnetic cataclysmic binary. A comparison of the HEAO-1 and Einstein fluxes for the source indicates that it is variable in the long term by at least a factor of ten. Attention is also given to two other faint X-ray sources observed in or near the HEAO-1 error box. One is identified with an 8th magnitude star, the other with a quasar having a redshift z of 0.42.

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