Results 1 to 10 of about 85,147 (265)
X-ray properties of early-type stars [PDF]
Symposium - International Astronomical Union, 1994 Extensive stellar surveys with the Einstein Observatory (Chlebowski et al., 1989) and with ROSAT have clearly confirmed the presence of stellar X-ray emission over nearly the whole range of the HR diagram. In the ROSAT all-sky survey data approximately 20000 stellar X-ray sources were detected (Schmitt et al., 1992).
Thomas W. Berghöfer +1 more
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CNO abundances in Early Type Be Stars [PDF]
Symposium - International Astronomical Union, 2004 High dispersion spectra in the visible range were obtained for field Be Stars in both hemispheres. As Be Stars form a class of Main Sequence fast rotators, we are intended to test how their chemical composition can be affected by rotation.
Y. Frémat +6 more
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The properties of early-type stars in the Magellanic Clouds [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractThe past decade has witnessed impressive progress in our understanding of the physical properties of massive stars in the Magellanic Clouds, and how they compare to their cousins in the Galaxy. I summarise new results in this field, including evidence for reduced mass-loss rates and faster stellar rotational velocities in the Clouds, and their ...
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Ultraviolet Spectrophotometry of Early-Type Stars [PDF]
Symposium - International Astronomical Union, 1976 The ultraviolet spectra of B stars obtained with the sky scan telescope in the TD1 satellite have been used to obtain narrow-band magnitudes at several wavelengths. These photometric bands have an effective half-width of 100 Å. We have proposed a two-dimensional classification scheme based on ultraviolet colours, and some preliminary results are ...
K. Nandy +2 more
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The Astrophysical Journal, 1968 Surface magnetic field variations in early stars, suggesting mechanism for magnetic energy transfer from convective core to ...
A. Finzi, R. A. Wolf
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Mass Loss from Early-Type Stars [PDF]
Symposium - International Astronomical Union, 1970 Following the detailed study of four very high luminosity OB stars, a survey has been made for spectroscopic evidence of mass loss in a number of early-type supergiants. A list of spectroscopic criteria is given and the mass loss estimates for 24 stars plotted on the HR diagram.
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Observational aspects of macroturbulence in early type stars [PDF]
International Astronomical Union Colloquium, 1980 The basic premise of this paper is that the atmospheres of supergiants of spectral type 0, B, and A are not homogeneous static and stable. Observations show effects in the spectrum which seem to indicate velocity fields of many different scales, which probably are variable with depth and are certainly variable with time.
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Chemical Abundances of Early Type Stars [PDF]
Symposium - International Astronomical Union, 1998 X-rays from early-type stars are emitted by the corona or the stellar wind. The materials in the surface layer of early-type stars are not contaminated by nuclear reactions in the stellar inside. Therefore, abundance study of the early-type stars provides us an information of the abundances of the original gas.
S. Tanaka +5 more
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Observations of Stellar Winds in Early Type Stars [PDF]
International Astronomical Union Colloquium, 1981 I have been asked to review the “observations” of winds in “early-type” stars. This normally means stars of spectral type OB and those of the Wolf-Rayet (WR) class. In this paper I will concentrate on the massive population I stars of these types, and primarily the O and WR classes on which most of the recent work has been done.
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Ultraviolet Spectrophotometry of Early-Type Stars
The Astronomical Journal, 1964 Spinning rockets UV spectrophotometry of early type stars, discussing instrumentation, calibration, data recording and stellar ...
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