328 citations · 3.4k across the 37 of their papers we have counts for
3 papers · 1 filter
WR 72: a born-again planetary nebula with hydrogen-poor knots
V. V. Gvaramadze, A. Y. Kniazev, G. Graefener +1
We report the discovery of a handful of optical hydrogen-poor knots in the central part of an extended infrared nebula centred on the [WO1] star WR 72, obtained by spectroscopic an…
A massive white-dwarf merger product before final collapse
V. V. Gvaramadze, G. Gräfener, N. Langer +4
Gravitational wave emission can lead to the coalescence of close pairs of compact objects orbiting each other. For the case of neutron stars such mergers may yield masses above the…
The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters
W. -R. Hamann, G. Gräfener, A. Liermann +6
Comprehensive spectral analyses of the Galactic Wolf-Rayet stars of the nitrogen sequence (i.e.\ the WN subclass) have been performed in a previous paper. However, the distances of…