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Isophot Observations of Early-Type Stars
Astrophysics and Space Science, 1997Mass loss has an important effect on the evolution of early-type stars. The most reliable mass loss rates are determined from the radio continuum. However there is a wealth of observational evidence (Discrete Absorption Components, X-rays, IR continuum, Hα variability, …) indicating that the stellar wind is clumped.
R. Blomme +6 more
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Emission-line Stars and Early-type Stars with Gaia
EAS Publications Series, 2010Gaia will provide accurate parallaxes, spectrophotometry and spectroscopy for hundreds of thousands of emission-line stars across the whole HR diagram. In preparation for the Gaia mission, we are developing algorithms to recognize and classify emission-line stars. A large collection of ground-based spectroscopic observations has been collected and will
R. Blomme +3 more
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Early-type Emission-line Stars
2007Wolf-Rayet (WR) stars owe its name to the discoverers, C. Wolf and G. Rayet. They are one of the most conspicuous stellar objects in spectral features, activities, and in the processes of stellar evolution. They are spectroscopically characterized by the following features.
Tomokazu Kogure, Kam-Ching Leung
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Magnetism in massive early-type stars
EAS Publications Series, 2013In the last five years our knowledge of magnetism in early-type stars has significantly improved because of the new gen- eration of high-resolution spectropolarimeters (ESPaDOnS@CFHT, Narval@TBL, HARPSpol@ESO). The success of the Magnetism in Massive Stars (MiMeS) Project, for example, has greatly improved our understanding of the magnetic properties ...
J.H. Grunhut, G.A. Wade
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Ionizing radiation from early-type stars
2008A grid of NLTE model atmospheres for early-type stars is presented. Model atoms of eleven different elements with various abundances and, for a subset of the models, effects of wind blanketing, are taken into account. These model atmospheres supply realistic emergent fluxes which can be used in ionization calculations for circum- and interstellar gas ...
Dietmar Kunze +2 more
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Early-Type Emission-Line Stars
1982Early-type emission-line stars keep the continuous interest of the scientists. As it is believed the emission lines are formed in the extensive envelopes surrounding these stars. The various objects of this sort could be generally grouped into the following classes: a) the Of stars; b) the Wolf-Rayet stars; c) the Be-stars; d) the Shell stars; e) the B-
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Early-Type Emission Line Radio Stars
Publications of the Astronomical Society of Australia, 1975During the last few years, a new type of radio object has appeared in the literature: this is the Early Type Emission Line Star, or ETELS for short. These objects are possibly the most interesting radio object discovered since the pulsars. They are certainly more easily understood, since an explanation of their emission processes probably does not ...
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Early type stars with abnormal spectra
Vistas in Astronomy, 1974Abstract One of the areas which have received a great deal of attention in recent years is the field of the so-called early type peculiar stars. It seems that a review paper on the subject could be of some use, since it helps to visualize both the problems which have been solved and those which have not been solved or studied yet.
Mercedes Jaschek, Carlos Jaschek
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Abundance Anomalies in Early-Type Stars
1975Among the early-type stars, various groups are known to exhibit anomalous line strengths which are interpreted in terms of abundance anomalies, such as the Wolf-Rayet stars, the helium stars, the Bp stars, or the subdwarf 0 and B stars. The differences between their (surface) compositions and the material out of which the stars are formed may provide ...
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