Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astbu..66..460g&link_type=abstract
Astrophysical Bulletin, Volume 66, Issue 4, pp.460-465
Astronomy and Astrophysics
Astrophysics
Stars: Chemically Peculiar, Stars: Individual: Hd 182255
Scientific paper
We investigate the HD 182255, a star earlier suspected to be helium-weak. We show it to be a SiHe-w-type CP object. Our study revealed four regions with anomalous elemental abundances on the stellar surface near the equator of rotation. Its magnetic field could not be measured, apparently due to the unfavorable orientation of the star. The star is seen almost (rotation) pole on, the inclination of its rotation axis is i = 12°. The magnitude of HD 182255 varies as a result of its rotation owing to the nonuniform distribution of chemical elements on its surface, which leads to the variable blanketing effect. The helium and silicon abundances increase with depth, i.e., the stratification typical of CP stars is observed. The star undergoes nonradial pulsations and nonstationary variations of the structure of its upper atmosphere.
Chountonov Georgij A.
Glagolevskij Yu. V.
Shavrina Angelina V.
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