Variability of the Ap Star HD9996

V. D. Bychkov; L. V. Bychkova; J. Madej; A. V. Shatilov

Variability of the Ap Star HD9996

Solar and Stellar Astrophysics 2012-11-07 v1

Authors: V. D. Bychkov , L. V. Bychkova , J. Madej , A. V. Shatilov

Abstract

We present here new measurements of the longitudinal magnetic field (B_e) in the binary system HD9996, where the primary companion is an Ap star. Series of 63 B_e observations was obtained in years 1994-2011 with the 1m optical telescope of the Special Astrophysical Observatory (Russia). New magnetic data allowed us to refine the long-term magnetic period of HD9996 to P_mag=21.8 years. Compilation of archival photometric data showed the existence of long term variations of HD9996 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.

Keywords

Ap star HD9996 longitudinal magnetic field magnetic period precession photometric variability

Cite

@article{arxiv.1211.1266,
  title  = {Variability of the Ap Star HD9996},
  author = {V. D. Bychkov and L. V. Bychkova and J. Madej and A. V. Shatilov},
  journal= {arXiv preprint arXiv:1211.1266},
  year   = {2012}
}

Comments

15 pages, 7 figures

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