Absctract—The present study continues the investigation of the super-fast variability of line profiles in the spectra of stars of early spectral types. We studied the line-profile variability in the spectrum of the binary (O9.7Ib+B0III) star \(\zeta \) Ori A using the MSS spectrograph of the 6-m BTA telescope based on observations carried out on February 19, 2019. Short-period regular variations of the hydrogen Balmer lines and He I lines with periods from 89 to 295 minutes were found. The presence of short-period variations in the period interval of 10–20 minutes is also possible. An analysis of the stellar brightness variations from observations by the TESS satellite showed the presence of seven regular components, one of which is probably the second harmonic of the rotation period of the main component of the Aa star \(\zeta \) Ori A. The magnetic field of the star was determined for the whole series of observations. The longitudinal component of the root-mean-square magnetic field measured by the regression method over the whole observation period is \(49\) G.
Similar content being viewed by others
REFERENCES
A. A. Batrakov, A. F. Kholtygin, S. Fabrika, and A. Valeev, ASP Conf. Ser. 518, 153 (2019).
A. A. Batrakov, A. F. Kholtygin, S. Hubrig, et al., in Proc. conf. on Stars and their Variability Observed from Space, Vienna, 2019, Ed. by C. Neiner, W. W. Weiss, D. Baade, et al. (University of Vienna, 2020), p. 163.
A. Beauchamp and F.Wesemael, Astrophys. J. 496 (1), 395 (1998).
A. Blazère, C. Neiner, A. Tkachenko, et al., Astron. and Astrophys. 582, A110 (2015).
E. F. Borra and J.D. Landstreet, Astrophys. J. 185, L139 (1973).
J. C. Bouret, J. F. Donati, F. Martins, et al., Monthly Notices Royal Astron. Soc. 389 (1), 75 (2008).
I. Brott, S. E. de Mink, M. Cantiello, et al., Astron. and Astrophys. 530, A115 (2011).
B. Buysschaert, C. Neiner, N. D. Richardson, et al., Astron. and Astrophys. 602, A91 (2017).
G. A. Chountonov, in Proc. conf. on Spectroscopic Methods inModern Astrophysics,Moscow, Russia, 2006, Ed. by L. Mashonkina and M. Sachkov (2007), pp. 336–349.
G. A. Chountonov, Astrophysical Bulletin 71 (4), 489 (2016).
V. V. Dushin, A. F. Kholtygin, and G. A. Chountonov, Astrophysical Bulletin 67 (1), 67 (2012).
V. V. Dushin, A. F. Kholtygin, G. A. Chuntonov, and D. O. Kudryavtsev, Astrophysical Bulletin 68 (2), 184 (2013).
D. J. Hillier, Astrophys. J. 347, 392 (1989).
D. J. Hillier and D. L. Miller, Astrophys. J. 496 (1), 407 (1998).
S. Hubrig, I. Ilyin, A. F. Kholtygin, et al., Astronomische Nachrichten 338 (8), 926 (2017).
S. Hubrig, M. Schöller, and A. F. Kholtygin, Monthly Notices Royal Astron. Soc. 440 (2), 1779 (2014).
C. A. Hummel, T. Rivinius,M. F. Nieva, et al., Astron. and Astrophys. 554, A52 (2013).
J. M. Jenkins, J. D. Twicken, S. McCauliff, et al., SPIE Conf. Proc. 9913, 99133E (2016).
L. Kaper, H. F. Henrichs, A. W. Fullerton, et al., Astron. and Astrophys. 327, 281 (1997).
A. F. Kholtygin, A. A. Batrakov, S. N. Fabrika, et al., Astrophysical Bulletin 73 (4), 471 (2018).
A. F. Kholtygin, A. A. Batrakov, S. N. Fabrika, et al., Astrophysical Bulletin 75 (3), 278 (2020a).
A. F. Kholtygin, S. Hubrig, V. V. Dushin, et al., ASP Conf. Ser. 510, 299 (2017).
A. F. Kholtygin, N. P. Ikonnikova, A. V. Dodin, and O. A. Tsiopa, Astronomy Letters 46 (3), 168 (2020b).
A. F. Kholtygin, A. V. Moiseeva, I. A. Yakunin, and S. Hubrig, Astrophysical Bulletin 75 (3), 284 (2020c).
A. F. Kholtygin, D. N. Monin, A. E. Surkov, and S. N. Fabrika, Astronomy Letters 29, 175 (2003).
V. G. Klochkova, V. E. Panchuk, M. V. Yushkin, and D. S. Nasonov, Astrophysical Bulletin 63 (4), 386 (2008).
N. A. Kudryashova and A. F. Kholtygin, Astronomy Reports 45 (4), 287 (2001).
D. O. Kudryavtsev, in Proc. Int.Meeting onMagnetic Fields of Chemically Peculiar and Related Stars, Special Astrophysical Observatory of Russian AS, 1999, Ed. by Y. V. Glagolevskij and I. I. Romanyuk Special Astrophysical Observatory of Russian AS, 2000), p. 84.
A. A. Pamyatnykh, Acta Astronomica 49, 119 (1999).
V. E. Panchuk, G. A. Chuntonov, and I. D. Naidenov, Astrophysical Bulletin 69 (3), 339 (2014).
D. H. Roberts, J. Lehar, and J. W. Dreher, Astron. J. 93, 968 (1987).
I. I. Romanyuk, A. V.Moiseeva, E. A. Semenko, et al., Astrophysical Bulletin 75 (3), 294 (2020).
I. S. Savanov, I. I. Romanyuk, and E. S. Dmitrienko, Astron. Tsirkulyar, No. 1647, 1 (2020).
E. A. Semenko, I. I. Romanyuk, E. S. Semenova, et al., Astrophysical Bulletin 72 (4), 384 (2017).
O. Tsiopa, A. Batrakov, and A. Kholtygin, Astron. J. Azerbaijan 15, 20 (2020).
V. V. Vityazev, Analiz neravnomernyih ryadov (SPbSU Press, St. Petersburg, 2001) [in Russian].
E. Zari, A. G. A. Brown, and P. T. de Zeeuw, Astron. and Astrophys. 628, A123 (2019).
ACKNOWLEDGMENTS
The authors of the paper are grateful to D.O. Kudryav-tsev for observations of \(\zeta \) Ori A. The authors are also grateful to I.I. Romanyuk for advice and recommendations to improve the text of the paper.
Funding
AKh, AM, MK, and AK are grateful for the RFBR 19‑02-00311 A grant support. IY expresses gratitude to the RFBR project no. 19-32-60007 for supporting this work. Observations with SAO RAS telescopes are supported by the Ministry of Science and Higher Education of the Russian Federation (including agreement no. 05.619.21.0016, the unique project identifier RFMEFI61919X0016).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The authors declare no conflict of interest regarding the publication of this paper.
Additional information
Translated by N. Oborina
Rights and permissions
About this article
Cite this article
Kholtygin, A.F., Moiseeva, A.V., Kurdoyakova, M.S. et al. Super-Fast Line-Profile Variability in the Spectra of OBA Stars. IV: ζ Ori A. Astrophys. Bull. 76, 185–195 (2021). https://doi.org/10.1134/S1990341321020048
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1990341321020048