Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1310s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Nov. 1990, p. 1310-1317.
Astronomy and Astrophysics
Astronomy
9
Astronomical Photometry, Emission Spectra, Iue, Line Spectra, Optical Data Processing, X Ray Binaries, Charge Coupled Devices, Heao 1, Light Curve
Scientific paper
IUE short- and long-wavelength spectra, CCD differential BR photometry, and a portion of a J light curve were obtained during January-March 1989 when H0538 + 608 (BY Cam) was in a low state about 3 magnitudes below its normal high-state V magnitude. The IUE short-wavelength spectrum showed that all the strong emission lines apparent at the high state had disappeared while the continuum flux had decreased by about a factor of 3. The B and R data show large (0.8 and 1.5 mag) spikelike increases in light near phase 0.75, while the B light curve shows a slow modulation with peak intensity near phase 0.3. The implications are that both poles are still producing some emission, although the accretion onto the main pole is much reduced from the high-state value. In comparison to the low state of AM Her, the UV and IR fluxes would be consistent with viewing a hot white dwarf and a late-main-sequence secondary at a distance of several hundred pc.
Downes Ronald A.
Mateo Mario
Szkody Paula
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