Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Koenigsberger, G."'
Chemically homogeneous evolution (CHE) is a promising channel for forming massive binary black holes. The enigmatic, massive Wolf-Rayet (WR) binary HD 5980 A&B has been proposed to have formed through this channel. We investigate this claim by compar
Externí odkaz:
http://arxiv.org/abs/2402.12438
Autor:
Toalá, J. A., Bowman, D., Van Reeth, T., Todt, H., Dsilva, K., Shenar, T., Koenigsberger, G., Estrada-Dorado, S., Oskinova, L. M., Hamann, W. -R.
We present the analysis of the optical variability of the early, nitrogen-rich Wolf-Rayet (WR) star WR7. The analysis of multi-sector Transiting Exoplanet Survey Satellite (TESS) light curves and high-resolution spectroscopic observations confirm mul
Externí odkaz:
http://arxiv.org/abs/2205.11318
Akademický článek
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Context: The technique of matching synthetic spectra computed with theoretical stellar atmosphere models to the observations is widely used in deriving fundamental parameters of massive stars. When applied to binaries, however, these models generally
Externí odkaz:
http://arxiv.org/abs/1307.1970
A number of binary systems present evidence of enhanced activity around periastron passage, suggesting a connection between tidal interactions and these periastron effects. The aim of this investigation is to study the time-dependent response of a st
Externí odkaz:
http://arxiv.org/abs/1102.4301
We present the results of high precision, high resolution (R~68000) optical observations of the short-period (4d) eccentric binary system Alpha Virginis (Spica) showing the photospheric line-profile variability that in this system can be attributed t
Externí odkaz:
http://arxiv.org/abs/0908.3336
Autor:
Foellmi, C., Koenigsberger, G., Georgiev, L., Toledano, O., Marchenko, S. V., Massey, P., Dall, T. H., Moffat, A. F. J., Morrell, N., Corcoran, M., Kaufer, A., Naze, Y., Pittard, J., -Louis, N. St., Fullerton, A., Massa, D., Pollock, A. M. T.
Publikováno v:
Rev.Mex.Astron.Astrofis.44:3-27,2008
We present the results of optical wavelength observations of the unusual SMC eclipsing binary system HD 5980 obtained in 1999 and 2004--2005. Radial velocity curves for the erupting LBV/WR object (star A) and its close WR-like companion (star B) are
Externí odkaz:
http://arxiv.org/abs/0711.4858
Autor:
Koenigsberger, G., Georgiev, L., Moreno, E., Richer, M. G., Canalizo, O. Toledano G., Arrieta, A.
The X-ray source 2S0114+650=LSI+65 010 is a binary system containing a B-type primary and a low mass companion believed to be a neutron star. The system has three reported periodicities: the orbital period, P{orb}~11.6 d, X-ray flaring with P{flare}~
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608226
Autor:
Naze, Y., Hartwell, J. M., Stevens, I. R., Corcoran, M. F., Chu, Y. -H., Koenigsberger, G., Moffat, A. F. J., Niemela, V. S.
Publikováno v:
Astrophys.J. 580 (2002) 225-234
We present results from a Chandra observation of the NGC346 cluster. This cluster contains numerous massive stars and is responsible for the ionization of N66, the most luminous HII region and the largest star formation region in the SMC. In this fir
Externí odkaz:
http://arxiv.org/abs/astro-ph/0208289
Autor:
Morel, T., Marchenko, S. V., Eenens, P. R. J., Moffat, A. F. J., Koenigsberger, G., Antokhin, I. I., Eversberg, T., Tovmassian, G. H., Hill, G. M., Cardona, O., St-Louis, N.
We present the results of an intensive campaign of spectroscopic and photometric monitoring of the peculiar Wolf-Rayet star WR 134 from 1989 to 1997. This unprecedentedly large data set allows us to confirm unambiguously the existence of a coherent 2
Externí odkaz:
http://arxiv.org/abs/astro-ph/9901269