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

Abstract

view Abstract Citations (28) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of a soft X-ray flux from AN Ursae Majoris. Hearn, D. R. ; Marshall, F. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: August 1979 DOI: 10.1086/183028 Bibcode: 1979ApJ...232L..21H Keywords: Light Curve; Spaceborne Astronomy; Variable Stars; X Ray Sources; Optical Polarization; Radiant Flux Density; Sas-3; Satellite Observation; Astrophysics; AM Herculis Stars:X Rays full text sources ADS | data products SIMBAD (2)