Variability of the Ap Star HD 9996

被引：0
作者：
Bychkov, V. D. [1 ]
Bychkova, L. V. [1 ]
Madej, J. [2 ]
Shatilov, A. V. [1 ]
机构：
[1] Special Astrophys Observ RAS, Niznyi Arkhyz, Russia
[2] Univ Warsaw Observ, PL-00478 Warsaw, Poland
来源：
ACTA ASTRONOMICA | 2012年 / 62卷 / 03期
关键词：
Stars: chemically peculiar; Stars: individual: HD 9996; Stars: magnetic fields; MAGNETIC-FIELD; PRECESSION; PECULIAR; TIME;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present here new measurements of the longitudinal magnetic field (B-e) in the binary system HD 9996, where the primary companion is an Ap star. Series of 63 B-e observations was obtained in years 1994-2011 with the 1-m optical telescope of the Special Astrophysical Observatory (Russia). New magnetic data allowed us to refine the long-term magnetic period of HD 9996 to P-mag = 21.8 years. Compilation of archival photometric data showed the existence of long-term variations of HD 9996 in time scale of 22-23 yr consistent with P-mag. We identify P-mag with the precession period of the primary Ap star and summarize search for a short-term rotational period and the rotational line broadening in this star.
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页码：297 / 311
页数：15
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