EK TrA, a close relative of VW HYI

Details EK TrA, a close relative of VW HYI EK TrA, a close relative of VW HYI

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.289..388g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 289, Issue 2, pp. 388-392.

Astronomy and Astrophysics

Astronomy

20

Accretion, Accretion Discs, Binaries: Close, Stars: Individual: Ek Tra, Stars: Mass-Loss, White Dwarfs, Ultraviolet: Stars

Scientific paper

The southern dwarf nova EK TrA has been suggested to show the spectrum of its white dwarf primary in the single available International Ultraviolet Explorer (IUE) post-outburst spectrum. We demonstrate that this spectrum is still disc-dominated. However, a careful analysis reveals a white dwarf contribution of ~25 per cent of the SWP flux and a white dwarf temperature of T_wd~18000K. Our optical spectroscopy of the system deep in quiescence confirms the flux level of the white dwarf derived from the IUE data. Additional optical emission arises from a cool (T~6500K) accretion disc, possibly extending over the whole Roche lobe radius of the primary. Both optical and UV data yield a distance of d~180pc.

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