88 citations · 640 across the 28 of their papers we have counts for
9 papers · 1 filter
HD 93795: a late-B supergiant star with a square circumstellar nebula
V. V. Gvaramadze, A. Y. Kniazev, N. Castro +1
We report the discovery of a square axisymmetric circumstellar nebula around the emission-line star HD 93795 in archival Spitzer Space Telescope 24 micron data. We classify HD 9379…
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…
TYC 8606-2025-1: a mild barium star surrounded by the ejecta of a very late thermal pulse
V. V. Gvaramadze, Yu. V. Pakhomov, A. Y. Kniazev +4
We report the discovery of a spiral-like nebula with the Wide-field Infrared Survey Explorer (WISE) and the results of optical spectroscopy of its associated star TYC 8606-2025-1 w…
Two new HATNet hot Jupiters around A stars, and the first glimpse at the occurrence rate of hot Jupiters from TESS
G. Zhou, C. X. Huang, G. Á. Bakos +68
Wide field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between the properties of planets 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…
Star-forming rings in lenticular galaxies: origin of the gas
Irina S. Proshina, Alexei Yu. Kniazev, Olga K. Sil'chenko
Rings in S0s are enigmatic features which can however betray the evolutionary paths of particular galaxies. We have undertaken long-slit spectroscopy of five lenticular galaxies wi…