Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009astbu..64..166g&link_type=abstract
Astrophysical Bulletin, Volume 64, Issue 2, pp.166-175
Astronomy and Astrophysics
Astrophysics
2
95.75.Fg, 97.10.-Q, 97.10.Ex, 97.10.Ld, 97.10.Tk, 97.30.Fi
Scientific paper
Surface helium and silicon distribution of a He-weak CP star HD21699 was examined using the spectra obtained at different phases of the star’s rotational period. The abundance of helium over the whole surface is weak, but in the magnetic polar regions it is strong, apparently due to the impact of stellar wind. Silicon accumulates in the region with a horizontal alignment of the magnetic lines, as follows from the theory. The abundance of helium and silicon increases with depth. Moreover, the boundary of the abundance variation is very sharp and its depth practically does not change with the rotational period phase. Accounting for the stratification of chemical elements considerably changes the deduced temperature distribution with depth as well as the form of the hydrogen line profile.
Chountonov Georgij A.
Glagolevskij Yu. V.
Khalak V. R.
Pavlenko Ya. V.
Shavrina Angelina V.
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