Some properties of the He-w star HD 35502 |
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Authors: | Yu V Glagolevskij G A Chountonov A V Shavrina Ya V Pavlenko |
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Institution: | 1.Special Astrophysical Observatory,Russian Academy of Sciences,Stavropol,Russia;2.Main Astronomical Observatory,National Academy of Sciences of Ukraine,Kiev,Ukraine |
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Abstract: | This is a preliminary study of the star HD 35502. Its magnetic field has been measured in different phases of its period.
Preliminary values of the magnetic field parameters have been obtained based on a central quadrupole model. The effective
magnetic field Be varies over 0-5000 G, the average surface magnetic field ranges over 6300-6700 G, the field at the poles
is Bp=7000 G, and the angle between the quadrupole axis and the axis of rotation is β = 80o. As a first approximation, the
surface helium is concentrated around the (negative) pole and for τ > 1 its abundance is reduced by approximately 2-4 dex,
which confirms the hypothesis of helium diffusion under the action of gravitation and wind in a stable atmosphere. The chemical
elements Si and Cr are concentrated in four spots on the magnetic equator between the magnetic poles, or in a ring coincident
with the magnetic equator; precisely which is not clear at present. |
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