76 citations · 194 across the 7 of their papers we have counts for
4 papers · 1 filter
The polluted atmospheres of cool white dwarfs and the magnetic field connection
A. Kawka, S. Vennes
We present an analysis of X-Shooter spectra of the polluted hydrogen-rich white dwarfs (DAZ) NLTT 888 and NLTT 53908. The spectra of NLTT 53908 show strong, Zeeman-split calcium li…
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…
The double degenerate LP400-22 revisited
S. Vennes, A. Kawka, T. R. Vaccaro +1
We re-examine the properties of the high-velocity and extremely low mass white dwarf LP 400-22 and its close companion. Based on an extended observation timeline we determined a bi…