Results 281 to 290 of about 39,906 (300)

Pulsation of chemically peculiar stars

Proceedings of the International Astronomical Union, 2022
This paper reviews our current knowledge about pulsating chemically peculiar (CP) stars. CP stars are slowly rotating upper main-sequence objects, efficiently employing diffusion in their atmospheres.
E. Paunzen
semanticscholar   +2 more sources

New magnetic chemically peculiar stars

Astronomy Letters, 2002
Spectropolarimetric observations of 96 chemically peculiar (CP) main-sequence stars have been carried out at the 6-m telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) with the aim of searching for the presence of stellar magnetic fields.
Kudryavtsev, Dmitrii O., Romanyuk, Iosif I., Paunzen, Ernst   +2 more
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Chemically peculiar stars in binaries

EAS Publications Series, 2013
Strong photospheric chemical peculiarities are observed in a significant fraction of main sequence stars from B to early F spectral types. The development of these chemical peculiarities is understood in the framework of atomic diffusion. However, the details leading from this theoretical framework to the diversity of observed surface abundance ...
C.P. Folsom, G.A. Wade, E. Alecian
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Chemically peculiar hot stars

Astrophysics and Space Science, 1996
The upper main sequence is home to a diverse family of chemically peculiar stars, including λ Boo, Am-Fm, Bp-Ap, HgMn, He-weak, and He-rich varieties. This paper presents an informal review of the physical properties of these objects, including their location in the H-R diagram, frequency of incidence, rotation, binarity, magnetic fields, and ...
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Magnetic fields of chemically peculiar stars

Astrophysics, 2012
Models of the magnetic fields of 60 chemically peculiar (CP) stars are examined. The modelling technique assumes an internal structure of the magnetic field similar to a theoretical magnetic dipole. The magnetic field structures of most of the stars are not symmetric with respect to the center of the star.
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The surface composition of chemically peculiar stars

Journal of Physics G: Nuclear and Particle Physics, 1993
The surface chemical composition of a star can be altered by different mechanisms, such as internal nucleosynthesis and the mixing of this material to the star's surface, mass transfer in a binary system, or compositional differences in the gas from which stars form.
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A-Type and Chemically Peculiar Stars

1993
Conventional wisdom holds that early-type and late-type stars should have very different outer atmospheres, because the early-type stars lack deep convective zones and thus a mechanical energy source to heat their outer layers. I will show that the magnetic chemically peculiar (CP) stars hotter than about spectral type A2 display many of the phenomena ...
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Features of the Behavior of Magnetic Chemically Peculiar Stars on the Main Sequence. II

Astrophysical Bulletin, 2022
Y. Glagolevskij
semanticscholar   +1 more source

Magnetic Doppler Imaging of Chemically Peculiar Stars

2001
We present the results of numerical experiments andreal applications of our new Magnetic Doppler Imaging code INVERS10. The code is capable of simultaneously reconstructing the surface distribution of magnetic fieldv ectors andone chemical element from a time sequence of line profles measuredin four Stokes parameters.
N. Piskunov, O. Kochukhov
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Atmospheric Variations in Chemically Peculiar Stars

1989
The expression ‘Chemically Peculiar Stars’ was established by Preston in 1974 to group together the various types of stars with abnormal chemical composition on the upper main sequence. In this volume Maitzen (1989) gives a compilation of the variety of photometric and spectroscopic properties of all subtypes of CP stars.
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