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.

引用

收藏

页码：297 / 311

页数：15

相关论文

共 50 条

[41] Variation of the magnetic field of the Ap star HD 50169 over its 29-year rotation period [J].

Mathys, G. ;

Romanyuk, I. I. ;

Hubrig, S. ;

Kudryavtsev, D. O. ;

Landstreet, J. D. ;

Schoeller, M. ;

Semenko, E. A. ;

Yakunin, I. A. .

ASTRONOMY & ASTROPHYSICS, 2019, 624

[42] An analysis of the Ap binary HD 81009 [J].

Wade, GA ;

Debernardi, Y ;

Mathys, G ;

Bohlender, DA ;

Hill, GM ;

Landstreet, JD .

ASTRONOMY & ASTROPHYSICS, 2000, 361 (03) :991-1000

[43] The spectral variability and magnetic field characteristics of the Of?p star HD 148937 [J].

Wade, G. A. ;

Grunhut, J. ;

Graefener, G. ;

Howarth, I. D. ;

Martins, F. ;

Petit, V. ;

Vink, J. S. ;

Bagnulo, S. ;

Folsom, C. P. ;

Naze, Y. ;

Walborn, N. R. ;

Townsend, R. H. D. ;

Evans, C. J. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 419 (03) :2459-2471

[44] Time-resolved photometric and spectroscopic analysis of the luminous Ap star HD 103498 [J].

Joshi, S. ;

Ryabchikova, T. ;

Kochukhov, O. ;

Sachkov, M. ;

Tiwari, S. K. ;

Chakradhari, N. K. ;

Piskunov, N. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 401 (02) :1299-1307

[45] HD 18078: A very slowly rotating Ap star with an unusual magnetic field structure [J].

Mathys, G. ;

Romanyuk, I. I. ;

Kudryavtsev, D. O. ;

Landstreet, J. D. ;

Pyper, D. M. ;

Adelman, S. J. .

ASTRONOMY & ASTROPHYSICS, 2016, 586

[46] Extreme magnetic field modulus variability of the Bp star HD 57372 [J].

Hubrig, S. ;

Chojnowski, S. D. ;

Jaervinen, S. P. ;

Ilyin, I. ;

Pan, K. .

ASTRONOMY & ASTROPHYSICS, 2024, 687

[47] Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049 [J].

Kochukhov, O. ;

Rusomarov, N. ;

Valenti, J. A. ;

Stempels, H. C. ;

Snik, F. ;

Rodenhuis, M. ;

Piskunov, N. ;

Makaganiuk, V. ;

Keller, C. U. ;

Johns-Krull, C. M. .

ASTRONOMY & ASTROPHYSICS, 2015, 574

[48] The Ap spectroscopic binary HD 59435 revisited [J].

Wade, GA ;

Mathys, G ;

North, P .

ASTRONOMY & ASTROPHYSICS, 1999, 347 (01) :164-168

[49] The discovery of rapid oscillations in the magnetic Ap stars HD 69013 and HD 96237☆ [J].

Elkin, V. G. ;

Kurtz, D. W. ;

Worters, H. L. ;

Mathys, G. ;

Smalley, B. ;

van Wyk, F. ;

Smith, A. M. S. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2011, 411 (02) :978-982

[50] The discovery of a frequency quintuplet and distorted dipole mode in the rapidly oscillating Ap star HD 6532 [J].

Kurtz, DW ;

Martinez, P ;

Koen, C ;

Sullivan, DJ .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 281 (03) :883-892

← 1 2 3 4 5 →