73 citations · 405 across the 31 of their papers we have counts for
30 papers
Optical And X-ray Variability Of γ Cas Stars: Sao 49725
A. F. Kholtygin, I. Ya. Yakunin, V. S. Bukharinov +3
The present paper is devoted to studying the variability of the Cas type star SAO 49725. Both the optical and X-ray spectra of the star are analyzed. Variability of line profil…
Testing the fossil field hypothesis: could strongly magnetised OB stars produce all known magnetars?
Ekaterina I. Makarenko, Andrei P. Igoshev, A. F. Kholtygin
Stars of spectral types O and B produce neutron stars (NSs) after supernova explosions. Most of NSs are strongly magnetised including normal radio pulsars with …
Superfast Line Profile Variations in the Spectra of OBA Stars III: A0 Star CVn, New Results
A. F. Kholtygin, A. V. Moiseeva, I A. Yakunin +1
This work is a continuation of the studies of the ultrafast variability of line profiles in the spectra of early-type stars. Line profile variations (LPVs) in the spectrum a chemic…
A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7V star HD54879
S. Hubrig, M. Kueker, S. P. Jarvinen +4
Only eleven O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a -600G longitudinal magnetic field in the O9.7V star HD54879 with a…
On the origin of supergiant fast X-ray transients
Swetlana Hubrig, Lara Sidoli, Konstantin A. Postnov +3
A fraction of high-mass X-ray binaries are supergiant fast X-ray transients. These systems have on average low X-ray luminosities, but display short flares during which their X-ray…
Studying the presence of magnetic fields in a sample of high-mass X-ray binaries
Swetlana Hubrig, Alexander F. Kholtygin, Lara Sidoli +2
Previous circular polarization observations obtained with the ESO FOcal Reducer low dispersion spectrograpgh at the VLT in 2007-2008 revealed the presence of a weak longitudinal ma…