191 citations · 1.2k across the 25 of their papers we have counts for
25 papers
New binaries among UV-selected, hot subdwarf stars and population properties
A. Kawka, S. Vennes, S. O'Toole +4
We have measured the orbital parameters of seven close binaries, including six new objects, in a radial velocity survey of 38 objects comprising a hot subdwarf star with orbital pe…
The subdwarf B star SB 290 - A fast rotator on the extreme horizontal branch
S. Geier, U. Heber, C. Heuser +3
Hot subdwarf B stars (sdBs) are evolved core helium-burning stars with very thin hydrogen envelopes. In order to form an sdB, the progenitor has to lose almost all of its hydrogen…
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…
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…
Orbital properties of an unusually low-mass sdB star in a close binary system with a white dwarf
R. Silvotti, R. H. Østensen, S. Bloemen +17
We have used 605 days of photometric data from the Kepler spacecraft to study KIC 6614501, a close binary system with an orbital period of 0.15749747(25) days (3.779939 hours), tha…
The MUCHFUSS project - Searching for the most massive companions to hot subdwarf stars in close binaries and finding the least massive ones
S. Geier, V. Schaffenroth, H. Hirsch +12
The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions (massive white dwarfs…