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A selection of hot subluminous stars in the GALEX survey II. Subdwarf atmospheric parameters
Péter Németh, Adéla Kawka, Stéphane Vennes
We present an update of our low-resolution spectroscopic follow-up and model atmosphere analysis of hot subdwarf stars from the Galaxy Evolution Explorer (GALEX) survey. Targets we…
The shortest period sdB plus white dwarf binary CD-30 11223 (GALEX J1411-3053)
S. Vennes, A. Kawka, S. J. O'Toole +2
We report on the discovery of the shortest period binary comprising a hot subdwarf star (CD-30 11223, GALEX J1411-3053) and a massive unseen companion. Photometric data from the Al…
Properties of hot subdwarfs in the GALEX survey
Peter Nemeth, Adela Kawka, Stephane Vennes
We have analyzed a sample of hot subdwarfs (sdB, sdO) selected from the GALEX ultraviolet sky survey. Applying a model atmosphere analysis we determined the temperature, surface gr…
The 1.17-day orbit of the double-degenerate (DA+DQ) NLTT 16249
S. Vennes, A. Kawka, S. J. O'Toole +1
New spectroscopic observations show that the double degenerate system NLTT 16249 is in a close orbit (a = 5.6+/-0.3 R_sun) with a period of 1.17 d. The total mass of the system is…
A study of high proper-motion white dwarfs I. Spectropolarimetry of a cool hydrogen-rich sample
Adela Kawka, Stephane Vennes
We conducted a spectropolarimetic survey of 58 high proper-motion white dwarfs which achieved uncertainties of >2 kG in the Halpha line and >5 kG in the upper Balmer line series. T…
Binary properties of subdwarfs selected in the GALEX survey
Adela Kawka, Andrzej Pigulski, Simon O'Toole +6
We describe our programme to identify and analyse binary stars among the bright subdwarfs selected in the Galaxy Evolution Explorer (GALEX) survey. Radial velocity time-series help…