Abstract
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.
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References
I. K. Stateva, Astrophys. Space Sci. 226, 329 (1995).
J. R. Perch, Publ. Astron. Soc. Pacific. 97, 856 (1985).
D. N. Brown, S. N. Shore, and G. Sonneborn Astrophys. J. 90, 1354 (1985).
E. Gerth and Yu. V. Glagolevskij, in Magnetic Fields of Chemically Peculiar and Related Stars, Ed. by Yu. V. Glagolevskij and I. I. Romanyuk, (Moscow, 2000), p.151.
Yu.V. Glagolevskij and G.A. Chountonov, Astrophysics 50, 441 (2007).
Yu.V. Glagolevskij, V. V. Leushin, G.A. Chountonov, and D. Shulyak, Pis’ma Astronom. Zh. 31, 1 (2005).
V. E. Panchuk, N.E. Piskunov, V. G. Klochkova, et al. SAO Preprint No. 169 (2002).
J.-F. Donati, M. Semel, B. D. Carter, et al., Monthly Notices Roy. Astronom. Soc. 291, 658 (1997).
S. J. Khan, Quant. Spectrosc.Radiat. Transfer 88, 71 (2004).
V. Tsymbal, in Model Atmospheres and Spectrum Synthesis, Ed. by S. J. Adelman, F. Kupka, and W. W. Weiss”, ASP Conference Series 108, 198 (1996).
R. Kurucz, CDR (1–23), Smithsonian Astrophysical Observatory (Washington D.C., 1993).
Ya. V. Pavlenko, Astron. Rep. 47, 59 (2003).
F. Kupka, N. E. Piskunov, T. A. Ryabchikova, et al., Astronom. and Astrophys. Suppl. Ser. 138, 119 (1999).
F. Castelli, http://www.user.oat.ts.astro.it//castelli/
Ya. V. Pavlenko, Astronom. Astrophys. Space Sci. 253, 43 (1997).
P. S. Osmer and D. M. Peterson, Astrophys. J. 187, 117 (1973).
S. Vauclair, Astronom. and Astrophys. 45, 233 (1975).
D. N. Brown, S. N. Shore, and G. Sonneborn, Astrophys. J. 90, 1354 (1985).
S. N. Shore, D. N. Brown, and G. Sonneborn, Astronom. J. 94, 737 (1987).
M. R. Molnar, T. C. Stephens, and A. D. Mollama, Astrophys. J. 223, 185 (1978).
S. Vauclair, N. Dolez, and D. O. Gough, Astronom. and Astrophys. 252, 618 (1991).
M. Brequet, S. Hubrig, P. De Cat, et al., Astronom. and Astrophys. 466, 269 (2007).
N. Grevesse, M. Asplund, and A. Sauval, Space Science Reviews 130, 105 (2007).
S. Vauclair, J. Hardorp, and D.M. Pederson, Astrophys. J. 227, 526 (1979).
G. Alecian and S. Vauclair, Astronom. and Astrophys. 101, 16 (1981).
C. Megessier, Astronom. and Astrophys. 138, 267 (1984).
S. N. Shore and S. J. Adelman, Astrophys. J. 191, 165 (1974).
D. Monin and F. Leblanc, in Phisics of Magnetic Stars, Ed. by I. I. Romanyuk and D. O. Kudryavtsev (SAO RAS, 2007), p.360.
D. Shulyak, O. Kochukhov, and S. Khan, Astronom. and Astrophys. 487, 689 (2008).
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Original Russian Text © Yu.V. Glagolevskij, A.V. Shavrina, J. Sylvestre, G.A. Chountonov, Ya.V. Pavlenko, V.R. Khalak, 2009, published in Astrofizicheskij Byulleten, 2009, Vol. 64, No. 2, pp. 170–179.
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Glagolevskij, Y.V., Shavrina, A.V., Sylvestre, J. et al. Spot system and stratification of some chemical elements in the atmosphere of He-weak star HD 21699. Astrophys. Bull. 64, 166–175 (2009). https://doi.org/10.1134/S1990341309020059
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DOI: https://doi.org/10.1134/S1990341309020059