Analysis of IUE data on V426 Ophiuchi - Outburst and orbital variability

Details Analysis of IUE data on V426 Ophiuchi - Outburst and orbital variability Analysis of IUE data on V426 Ophiuchi - Outburst and orbital variability

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100.1111s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Sept. 1988, p. 1111-1117.

Other

5

Cataclysmic Variables, Dwarf Novae, Stellar Orbits, Ultraviolet Spectra, Variability, Carbon, Iue, Magnesium, Periodic Variations, Visible Spectrum

Scientific paper

Time-resolved IUE spectra throughout two orbits of the dwarf nova V426 Oph during quiescence are presented. It is found that the visual and C IV fluxes remain relatively constant during both orbits, whereas the UV coninua and Mg II lines vary by 20-30 percent. The time scales of this variability are discussed. Analysis of other spectra at brighter optical magnitudes shows that the UV lags the optical during a probable rise to outburst, similar to the behavior of SS Cyg. The reddening of V426 Oph is determined to be E(B-V) = 0.1. The contribution of the white dwarf to the UV flux at quiescence is estimated to be 25 percent, based on the system parameters of Hessman (1988) and the period-temperature relation of Sion (1987).

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