Discovery of a soft X-ray flux from an Ursae Majoris

Details Discovery of a soft X-ray flux from an Ursae Majoris Discovery of a soft X-ray flux from an Ursae Majoris

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232l..21h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 232, Aug. 15, 1979, p. L21-L23.

Astronomy and Astrophysics

Astronomy

25

Light Curve, Spaceborne Astronomy, Variable Stars, X Ray Sources, Optical Polarization, Radiant Flux Density, Sas-3, Satellite Observation

Scientific paper

During November 1975, the soft X-ray detectors on the SAS 3 satellite scanned across AN Ursae Majoris, a star very similar to AM Herculis in its unusual optical properties. A soft (0.1-0.4 keV) X-ray flux averaging 2.8 x 10 to the -11th erg/sq cm-sec was detected from AN UMa, as had been anticipated by analogy with AM Her. Folding the X-ray flux measurement with the known binary period reveals an X-ray light curve with approximately 100% modulation, and thereby secures the identification of the X-ray source as AN UMa. Unlike the case in AM Her, the X-ray minimum in AN UMa occurs midway between optical linear-polarization peaks.

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