Results 181 to 190 of about 720,446 (211)
Gamma-ray bursts and their use as cosmic probes. [PDF]
R Soc Open Sci, 2017 Schady P.
europepmc +1 more source
Gamma-ray bursts from tidally spun-up Wolf-Rayet stars? [PDF]
Astronomy and Astrophysics, 2008 The collapsar model requires rapidly rotating Wolf-Rayet stars as progenitors of long gamma-ray bursts. However, Galactic Wolf-Rayet stars rapidly lose angular momentum due to their intense stellar winds. We investigate whether the tidal interaction of a
Philipp Podsiadlowski, Robert G Izzard
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Annual Review of Astronomy and Astrophysics, 1987
This paper reviews the current status of knowledge regarding the basic physical and chemical properties of Wolf—Rayet stars; their overall mass loss and stellar wind characteristics and current ideas about their evolutionary status. WR stars are believed to be the evolved descendents of massive O—type stars, in which extensive mass loss reveals ...
Allan J. Willis, Catharine D. Garmany
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This paper reviews the current status of knowledge regarding the basic physical and chemical properties of Wolf—Rayet stars; their overall mass loss and stellar wind characteristics and current ideas about their evolutionary status. WR stars are believed to be the evolved descendents of massive O—type stars, in which extensive mass loss reveals ...
Allan J. Willis, Catharine D. Garmany
+4 more sources
Diagnostics of the unstable envelopes of Wolf-Rayet stars
Astronomy and Astrophysics, 2016 Context. The envelopes of stars near the Eddington limit are prone to various instabilities. A high Eddington factor in connection with the iron opacity peak leads to convective instability, and a corresponding envelope inflation may induce pulsational ...
Debashis Sanyal +2 more
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The non-radial stability of Wolf—Rayet stars
Monthly Notices of the Royal Astronomical Society, 2002 A non-radial non-adiabatic linear stability analysis of selected models for Wolf-Rayet stars is presented. Strange-mode instabilities with growth rates in the dynamical range are found to affect both radial and non-radial perturbations up to the harmonic
Wolfgang Glatzel
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Annual Review of Astronomy and Astrophysics, 1966
Wolf-Rayet stars are few in number and their spectra are easily recognised, for wide emission lines dominate the spectrum. The Wolf-Rayet stars form one of the few groups of stars which are named after astronomers. Wolf and Rayet (1867) at the Paris Observatory used a visual spectrometer to examine the spectra of stars and they noted that the spectra ...
openaire +1 more source
Wolf-Rayet stars are few in number and their spectra are easily recognised, for wide emission lines dominate the spectrum. The Wolf-Rayet stars form one of the few groups of stars which are named after astronomers. Wolf and Rayet (1867) at the Paris Observatory used a visual spectrometer to examine the spectra of stars and they noted that the spectra ...
openaire +1 more source
2008
Based on the so-called standard model for expanding atmospheres, non-LTE model calculations have been developed during the last years. Their application for the quantitative spectral analysis of WR stars is in progress. Recent results about the parameters and chemical composition of WR atmospheres are reviewed.
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Based on the so-called standard model for expanding atmospheres, non-LTE model calculations have been developed during the last years. Their application for the quantitative spectral analysis of WR stars is in progress. Recent results about the parameters and chemical composition of WR atmospheres are reviewed.
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The Wolf-Rayet stars and mass loss
Astrophysics and Space Science, 1969Wolf-Rayet stars are defined, a summary is given of the properties of Wolf-Rayet stars, and a qualitative model of a Wolf-Rayet star is sketched. It is incontrovertible that Wolf-Rayet stars are losing mass, a typical rate of mass loss being near 10-5 M ⊙ per year.
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1990
Wolf-Rayet stars represent an important stage in the evolution of massive stars, but are only poorly understood so far. For a better knowledge one might determine their effective temperatures, luminosities and atmospheric compositions. But the emission-line dominated Wolf-Rayet spectra were not accessible to a quantitative analysis for a long time ...
W.-R. Hamann +7 more
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Wolf-Rayet stars represent an important stage in the evolution of massive stars, but are only poorly understood so far. For a better knowledge one might determine their effective temperatures, luminosities and atmospheric compositions. But the emission-line dominated Wolf-Rayet spectra were not accessible to a quantitative analysis for a long time ...
W.-R. Hamann +7 more
openaire +1 more source