Zobrazeno 51 - 60
of 470
pro vyhledávání: '"A, Gvaramadze"'
Autor:
Burgemeister, Sonja, Gvaramadze, Vasilii V., Stringfellow, Guy S., Kniazev, Alexei Y., Todt, Helge, Hamann, Wolf-Rainer
Publikováno v:
Monthly Notices of the Royal Astronomical Society, December 2012
Two optically obscured Wolf-Rayet (WR) stars have been recently discovered by means of their infrared (IR) circumstellar shells, which show signatures of interaction with each other. Following the systematics of the WR star catalogues, these stars ob
Externí odkaz:
http://arxiv.org/abs/1212.3727
We report the discovery of a bow-shock-producing star in the vicinity of the young massive star cluster NGC 3603 using archival data of the Spitzer Space Telescope. Follow-up optical spectroscopy of this star with Gemini-South led to its classificati
Externí odkaz:
http://arxiv.org/abs/1211.5926
Mass-loss rate, $\dot{M}$, is one of the key parameters affecting evolution and observational manifestations of massive stars, and their impact on the ambient medium. Despite its importance, there is a factor of ~100 discrepancy between empirical and
Externí odkaz:
http://arxiv.org/abs/1209.0455
A significant fraction of massive stars in the Milky Way and other galaxies are located far from star clusters. It is known that some of these stars are runaways and therefore most likely were formed in embedded clusters and then ejected into the fie
Externí odkaz:
http://arxiv.org/abs/1206.1596
Autor:
Gvaramadze, V. V., Menten, K. M.
We report the discovery of a bipolar nebula around the peculiar emission-line star MWC 349A using archival Spitzer Space Telescope 24 um data. The nebula extends over several arcminutes (up to 5 pc) and has the same orientation and geometry as the we
Externí odkaz:
http://arxiv.org/abs/1203.2953
Autor:
Gvaramadze, V. V., Kniazev, A. Y., Miroshnichenko, A. S., Berdnikov, L. N., Langer, N., Stringfellow, G. S., Todt, H., Hamann, W. -R., Grebel, E. K., Buckley, D., Crause, L., Crawford, S., Gulbis, A., Hettlage, C., Hooper, E., Husser, T. -O., Kotze, P., Loaring, N., Nordsieck, K. H., O'Donoghue, D., Pickering, T., Potter, S., Colmenero, E. Romero, Vaisanen, P., Williams, T., Wolf, M., Reichart, D. E., Ivarsen, K. M., Haislip, J. B., Nysewander, M. C., LaCluyze, A. P.
We report the discovery of two new Galactic candidate luminous blue variable (cLBV) stars via detection of circular shells (typical of known confirmed and cLBVs) and follow-up spectroscopy of their central stars. The shells were detected at 22 um in
Externí odkaz:
http://arxiv.org/abs/1201.2854
We have undertaken a near-IR spectral survey of stars associated with compact nebulae recently revealed by the Spitzer and WISE imaging surveys. These circumstellar nebulae, produced by massive evolved stars, display a variety of symmetries and shape
Externí odkaz:
http://arxiv.org/abs/1112.2686
We have undertaken a near-infrared spectral survey of stars associated with compact mid-IR shells recently revealed by the MIPSGAL (24 micron) and GLIMPSE (8 micron) Spitzer surveys, whose morphologies are typical of circumstellar shells produced by
Externí odkaz:
http://arxiv.org/abs/1112.2685
The question whether or not massive stars can form in isolation or only in star clusters is of great importance for the theory of (massive) star-formation as well as for the stellar initial mass function of whole galaxies (IGIMF-theory). While a seem
Externí odkaz:
http://arxiv.org/abs/1111.0294
We report the first-ever discovery of an extragalactic Wolf-Rayet (WR)star with Spitzer. A new WR star in the Large Magellanic Cloud (LMC) was revealed via detection of its circumstellar shell using 24 {\mu}m images obtained in the framework of the S
Externí odkaz:
http://arxiv.org/abs/1110.0126