Zobrazeno 1 - 10
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pro vyhledávání: '"Kholtygin, A. F."'
Autor:
Kholtygin, A. F.
We model the line profile variability (lpv) in spectra of clumped stellar atmospheres using the Stochastic Clump Model (SCM) of the winds of early-type stars. In this model the formation of dense inhomogeneities (clumps) in the line driven winds is c
Externí odkaz:
http://opus.kobv.de/ubp/volltexte/2008/1818/
Autor:
Kholtygin, A. F.
Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007
Externí odkaz:
http://opus.kobv.de/ubp/volltexte/2008/1779/
Testing the fossil field hypothesis: could strongly magnetised OB stars produce all known magnetars?
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 $B \propto 10^{12}$ G and magnetars with $B\propto 10^{14}$ G. A fraction of 7-12 per cent
Externí odkaz:
http://arxiv.org/abs/2104.10579
Publikováno v:
Astrophysical Bulletin, Volume 75, Issue 3, p.284-293 (2020) Astrophysical Bulletin Astrophysical Bulletin Astrophysical Bulletin
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 chemically peculiar A0Vp star $\alpha^2\,$CVn are investigated using the Jan
Externí odkaz:
http://arxiv.org/abs/2011.01312
Autor:
Hubrig, S., Kueker, M., Jarvinen, S. P., Kholtygin, A. F., Schöller, M., Ryspaeva, E. B., Sokoloff, D. D.
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 lower limit of the dipole strength of ~2kG, was discovered a few years
Externí odkaz:
http://arxiv.org/abs/1901.03975
Autor:
Hubrig, Swetlana, Sidoli, Lara, Postnov, Konstantin A., Schöller, Markus, Kholtygin, Alexander F., Jarvinen, Silva P.
Publikováno v:
Proc. IAU 14 (2018) 193-196
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 luminosity rises by a few orders of magnitude. The leading model for
Externí odkaz:
http://arxiv.org/abs/1812.04483
Autor:
Hubrig, Swetlana, Kholtygin, Alexander F., Sidoli, Lara, Schöller, Markus, Jarvinen, Silva P.
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 magnetic field on the surface of the optical component of the X-ray bina
Externí odkaz:
http://arxiv.org/abs/1812.04479
Recent XMM-Newton observations of the B2 type star rho Oph A indicated a periodicity of 1.205d, which was ascribed to rotational modulation. Since variability of X-ray emission in massive stars is frequently the signature of a magnetic field, we inve
Externí odkaz:
http://arxiv.org/abs/1712.05939
Autor:
Hubrig, S., Sidoli, L., Postnov, K., Schöller, M., Kholtygin, A. F., Jarvinen, S. P., Steinbrunner, P.
A significant fraction of high-mass X-ray binaries are supergiant fast X-ray transients (SFXTs). The prime model for the physics governing their X-ray behaviour suggests that the winds of donor OB supergiants are magnetized. To investigate if magneti
Externí odkaz:
http://arxiv.org/abs/1712.00345
Autor:
Lee, Byeong-Cheol, Gadelshin, D., Han, Inwoo, Kang, Dong-Il, Kim, Kang-Min, Valyavin, G., Galazutdinov, G., Jeong, Gwanghui, Beskrovnaya, N., Burlakova, T., Grauzhanina, A., Ikhsanov, N. R., Kholtygin, A. F., Valeev, A., Bychkov, V., Park, Myeong-Gu
We present high-resolution spectropolarimetric observations of the spectroscopic binary Chi Dra. Spectral lines in the spectrum of the main component Chi Dra A show variable Zeeman displacement, which confrms earlier suggestions about the presence of
Externí odkaz:
http://arxiv.org/abs/1709.08777