Details

Autor(en) / Beteiligte

• Gansicke, B. T.
• Beuermann, K.
• Thomas, H.-C.

Titel

EK TrA, a close relative of VW Hyi

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 1997-08, Vol.289 (2), p.388-392

Ort / Verlag

Oxford, UK: Blackwell Science Ltd

Erscheinungsjahr

1997

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Twd ≈ 18 000K. 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 ≈ 6500 K) accretion disc, possibly extending over the whole Roche lobe radius of the primary. Both optical and UV data yield a distance of d ≈ 180 pc.