Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Gvaramadze, Vasilii"'
We report the results of optical \'echelle spectroscopy with the Southern African Large Telescope (SALT) of the mass donor star BSDL\,923 in the neutron star (NS) high-mass X-ray binary XMMU\,J051342.6$-$672412 associated with the LMC supernova remna
Externí odkaz:
http://arxiv.org/abs/2306.06437
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 513, Issue 4, July 2022, Pages 5752-5765
Luminous Blue Variables (LBVs) are massive stars that show strong spectral and photometric variability. The question of what evolutionary stages they represent and what exactly drives their instability is still open, and thus is it important to under
Externí odkaz:
http://arxiv.org/abs/2205.14542
Publikováno v:
Res. Notes AAS 4 169 (2020)
We present the results of deep narrowband imaging of two nested shells around the blue supergiant ALS 19653,which confirm that the outer shell is physically associated with the star.
Externí odkaz:
http://arxiv.org/abs/2010.00033
The merger of two white dwarfs (WD) is a natural outcome from the evolution of many binary stars. Recently, a WD merger product, IRAS 00500+6713, was identified. IRAS 00500+6713 consists of a central star embedded in a circular nebula. The analysis o
Externí odkaz:
http://arxiv.org/abs/2008.10612
Publikováno v:
A&A 625, A4 (2019)
The Bubble Nebula (or NGC 7635) is a parsec-scale seemingly spherical wind-blown bubble around the relatively unevolved O star BD+60$^\circ$2522. The small dynamical age of the nebula and significant space velocity of the star suggest that the Bubble
Externí odkaz:
http://arxiv.org/abs/1903.05505
Publikováno v:
MNRAS, vol. 465, issue 2, pp. 1573-1585, 2017
High-resolution mid-infrared observations of astrospheres show that many of them have filamentary (cirrus-like) structure. Using numerical models of dust dynamics in astrospheres, we suggest that their filamentary structure might be related to specif
Externí odkaz:
http://arxiv.org/abs/1612.08349
Autor:
Mackey, Jonathan, Haworth, Thomas J., Gvaramadze, Vasilii V., Mohamed, Shazrene, Langer, Norbert, Harries, Tim J.
Publikováno v:
A&A 586, A114 (2016)
Mid-infrared arcs of dust emission are often seen near ionizing stars within HII regions. A possible explanations for these arcs is that they could show the outer edges of asymmetric stellar wind bubbles. We use two-dimensional, radiation-hydrodynami
Externí odkaz:
http://arxiv.org/abs/1512.06857
Publikováno v:
A&A 573, A10 (2015)
Interstellar bubbles around O stars are driven by a combination of the star's wind and ionizing radiation output. The wind contribution is uncertain because the boundary between the wind and interstellar medium is difficult to observe. Mid-infrared o
Externí odkaz:
http://arxiv.org/abs/1410.0019
Autor:
Mackey, Jonathan, Mohamed, Shazrene, Gvaramadze, Vasilii V., Kotak, Rubina, Langer, Norbert, Meyer, Dominique M. -A., Moriya, Takashi J., Neilson, Hilding R.
Publikováno v:
Nature, 512, 282-285 (21 August 2014)
Betelgeuse, a nearby red supergiant, is a runaway star with a powerful stellar wind that drives a bow shock into its surroundings. This picture has been challenged by the discovery of a dense and almost static shell that is three times closer to the
Externí odkaz:
http://arxiv.org/abs/1408.2522
Autor:
Mackey, Jonathan, Langer, Norbert, Mohamed, Shazrene, Gvaramadze, Vasilii V., Neilson, Hilding R., Meyer, Dominique M. -A.
Publikováno v:
ASTRA Proceedings, Volume 1, Issue 1, 2014, pp.61-63
We discuss two important effects for the astrospheres of runaway stars: the propagation of ionizing photons far beyond the astropause, and the rapid evolution of massive stars (and their winds) near the end of their lives. Hot stars emit ionizing pho
Externí odkaz:
http://arxiv.org/abs/1407.8396