Evolution of massive stars, supergiants and Wolf-Rayet stars
نویسندگان
چکیده
منابع مشابه
The Breakout of Relativistic Jets from Massive Wolf-rayet Stars
New twoand three-dimensional calculations are presented of relativistic jet propagation and break out in massive Wolf-Rayet stars. Such jets are thought responsible for gamma-ray bursts. As it erupts, the highly relativistic jet core (3 to 5 degrees) is surrounded by a cocoon of less energetic, but still moderately relativistic ejecta (Γ ∼ 15) that expands and becomes visible at larger polar an...
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We report the discovery of fifteen previously unknown Wolf-Rayet (WR) stars found as part of an infrared broad-band study of candidate WR stars in the Galaxy. We have derived an empirically-based selection algorithm which has selected ∼5000 WR candidate stars located within the Galactic Plane drawn from the GLIMPSE (midinfrared) and 2MASS (near-infrared) catalogues. Spectroscopic follow-up of 1...
متن کاملWolf–rayet Stars and Radioisotope Production
Radioisotopes are natural clocks which can be used to estimate the age of the solar system and of the Universe (see e.g. Takahashi 1998; Chen & Tilton 1976; see also the recent review by Arnould & Takahashi 1999). They are responsible for the steady decline of the light curves of supernovae (see e.g. Diehl & Timmes 1998, and references therein). The diffuse emission at 1.8 MeV from the decay of...
متن کاملRevised stellar parameters of Wolf - Rayet stars
We discuss the reliability of the stellar parameters derived from spectroscopic analyses with atmosphere models. We follow the revisions of the stellar parameters of a WN4b star through improvements of the model codes carried out in the last ten years. In order to judge the reliability of the current 'results we have started to analyze binaries for which the mass of the WR star is known and the...
متن کاملPhysical Properties of Wolf-Rayet Stars
The striking broad emission line spectroscopic appearance of Wolf-Rayet (WR) stars has long defied analysis, due to the extreme physical conditions within their line and continuum forming regions. Recently, model atmosphere studies have advanced sufficiently to enable the determination of stellar temperatures, luminosities, abundances, ionizing fluxes and wind properties. The observed distribut...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1984
ISSN: 0074-1809
DOI: 10.1017/s007418090003103x