Results 221 to 230 of about 28,753 (238)

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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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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Features of the Behavior of Magnetic Chemically Peculiar Stars on the Main Sequence. II

Astrophysical Bulletin, 2022
Y. Glagolevskij
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Magnetic field structures in chemically peculiar stars

Astrophysical Bulletin, 2011
We report the results of magnetic field modelling of around 50 CP stars, performed using the “magnetic charges” technique. The modelling shows that the sample reveals four main types of magnetic configurations: 1) a central dipole, 2) a dipole, shifted along the axis, 3) a dipole, shifted across the axis, and 4) complex structures. The vast majority of
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Theory of spots on chemically peculiar stars

EAS Publications Series, 2014
Surface inhomogeneities are found in many stars. In active sun-like stars and cool giants temperature spots similar to that found in the Sun are recovered from the inversion of spectroscopic data. M-dwarfs also show highly inhomogeneous surface structures in polarized light and photometric variability that are believed to be connected with cool regions
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The chemically peculiar stars of the upper main sequence

Nuclear Instruments and Methods, 1973
Abstract Abundance anomalies of two classes of peculiar main sequence stars are reviewed. The anomalies include gross overabundances of some elements and deficiencies of others. Isotopic abundances of three elements appear to be abnormal.
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Magnetic Field Structures of Chemically Peculiar Stars. II. HD98088, HD182180, HD221218, HD318107

Astrophysics
Y. Glagolevskij
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Chemically Peculiar (CP) Stars

2017
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