76 citations · 194 across the 7 of their papers we have counts for
7 papers
eRO-ExTra: eROSITA extragalactic non-AGN X-ray transients and variables in eRASS1 and eRASS2
Iuliia Grotova, Arne Rau, Mara Salvato +19
(Abridged) While previous X-ray studies showed the dominance of regular active galactic nuclei (AGN) variability, a small fraction of sources arise from more exotic phenomena such…
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…
CPD-20 1123 (Albus 1) is a bright He-B Subdwarf
Stephane Vennes, Adela Kawka, J. Allyn Smith
Based on photometric and astrometric data it has been proposed that Albus 1 (also known as CPD-20 1123) might be a hot white dwarf similar to G191-B2B or, alternatively, a hot subd…