Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..616s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 700, p. 616-618
Astronomy and Astrophysics
Astronomy
5
Bremsstrahlung, Cataclysmic Variables, Plasma Density, X Ray Astronomy, X Ray Binaries, Amplitudes, Astronomical Photometry, Ginga Satellite, Light Curve, Modulation, Periodic Variations, Rosat Mission, Sky Surveys (Astronomy), Space Observations (From Earth), Stellar Magnitude
Scientific paper
The cataclysmic variable S193 was observed with the Ginga and ROSAT satellites, along with ground-based optical observations. The bremsstrahlung temperatures and the column densities derived from these two observations are noticeably different. However, since the observations were separated by 3 yr and took place at different optical magnitudes, it is not clear whether this is related to an intrinsic change in the system or to a two component source of X-rays. While the X-ray data are not sufficient to accomplish a detailed analysis for periodicities, the Ginga data place an upper limit of 40% on the amplitude of any sinusoidal modulation.
Castelaz Michael
Garnavich Peter
Makino Fumiyoshi
Szkody Paula
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