Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..144d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 1, 1991, p. 144-151.
Astronomy and Astrophysics
Astronomy
10
Dwarf Novae, Interstellar Extinction, Spectrum Analysis, Stellar Spectra, Ultraviolet Spectra, Andromeda Constellation, Carbon, Continuous Spectra, Iue, Line Spectra, Nitrogen
Scientific paper
Ultraviolet observations of the little-studied dwarf nova, DX And, are presented. The observations were made with the International Ultraviolet Explorer satellite during the late stages of a rise to outburst maximum in November 1989. The spectra indicate a low orbital inclination angle and show clear signs of substantial interstellar reddening. The wind-dominated N v 1240 A and C IV 1549 A profiles show significant velocity-shifting within the time series of spectra. If these motions are linked with the binary orbit, an estimate of 11 hr is obtained for the orbital period. Fitting of the C IV and N v absorption profiles provides a lower limit to the mass loss rate of a few times 10 to the -11th solar mass/yr. It is argued that the ionization state of DX And's wind is most probably higher than usual or, failing that, the nitrogen abundance in the accreting material is enhanced.
Drew Janet E.
Hoare Melvin G.
Woods John A.
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