Long-Term Variability in the Magnetic Field of the Ap Star γ Equ

被引：11

作者：

Savanov, I. S. ^{[1
]}

Romanyuk, I. I. ^{[2
]}

Dmitrienko, E. S. ^{[3
]}

机构：

[1] Russian Acad Sci, Inst Astron, Moscow 119017, Russia

[2] Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia

[3] LomonosovMoscow State Univ, Sternberg Astron Inst, Moscow 119991, Russia

来源：

ASTROPHYSICAL BULLETIN | 2018年 / 73卷 / 04期

基金：

俄罗斯科学基金会;

关键词：

stars: individual: gamma Equ; CP-STARS;

D O I：

10.1134/S1990341318040089

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

New measurements of the longitudinal magnetic field of the Ap star gamma Equ obtained with the MSS spectrograph of the 6-m telescope of the SAO RAS in 2002-2018 are present. Analyzing our results together with all the available literature data sources of aEuroB (z) aEuroe (441 measurements) we found the rotation period P = 89.1 +/- 4.2 years (32 521 days). Fitting all the measurements with double sine-wave function resulted in two periods equal to 95.5 and 17.4 years (with the errors of 3.5 and 2 years correspondingly). According to our new estimate, the transition to positive values of aEuroB (z) aEuroe, probably, will occur later than previously assumed, literally in 2031.

引用

页码：463 / 465

页数：3

共 8 条

[1] Magnetic field topology and chemical spot distributions of the Ap star HD 119419
Rusomarov, N.
Kochukhov, O.
Lundin, A.
ASTRONOMY & ASTROPHYSICS, 2018, 609
[2] Modelling the light variability of the Ap star ε Ursae Majoris
Shulyak, D.
Krticka, J.
Mikulasek, Z.
Kochukhov, O.
Lueftinger, T.
ASTRONOMY & ASTROPHYSICS, 2010, 524
[3] Nonlinear simulations explaining Ap star magnetic fields by instability remnants
Szklarski, J.
Arlt, R.
ASTRONOMY & ASTROPHYSICS, 2013, 550
[4] Magnetic field measurement of the star HD 35298
Yakunin, I. A.
ASTROPHYSICAL BULLETIN, 2013, 68 (02) : 214 - 218
[5] On the Magnetic Field Structure of Chemically Peculiar Star 53 Cam
Romanyuk, I. I.
Moiseeva, A., V
Kudryavtsev, D. O.
Yakunin, I. A.
Aitov, V. N.
Baklanova, D. N.
ASTROPHYSICAL BULLETIN, 2022, 77 (02) : 156 - 166
[6] Magnetic Stars with Wide Depressions in the Continuum. 1. The Ap Star with Strong Silicon Lines HD 5601
Romanyuk, I. I.
Kudryavtsev, D. O.
Semenko, E. A.
Moiseeva, A. V.
ASTROPHYSICAL BULLETIN, 2016, 71 (04) : 447 - 452
[7] Ap stars with resolved magnetically split lines: Magnetic field determinations from Stokes I and V spectra
Mathys, G.
ASTRONOMY & ASTROPHYSICS, 2017, 601
[8] Magnetic field topology and chemical abundance distributions of the young, rapidly rotating, chemically peculiar star HR5624
Kochukhov, O.
Silvester, J.
Bailey, J. D.
Landstreet, J. D.
Wade, G. A.
ASTRONOMY & ASTROPHYSICS, 2017, 605

← 1 →