Extensive study of HD 25558, a long-period double-lined binary with two SPB components
Article
Article Title | Extensive study of HD 25558, a long-period double-lined binary with two SPB components |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Sodor, A. (Author), De Cat, P. (Author), Wright, D. J. (Author), Neiner, C. (Author), Briquet, M. (Author), Lampens, P. (Author), Dukes, R. J. (Author), Henry, G. W. (Author), Williamson, M. H. (Author), Brunsden, E. (Author), Pollard, K. R. (Author), Cottrell, P. L. (Author), Maisonneuve, F. (Author), Kilmartin, P. M. (Author), Matthews, J. (Author), Kallinger, T. (Author), Beck, P. G. (Author), Kambe, E. (Author), Engelbrecht, C. A. (Author), Czanik, R. J. (Author), Yang, S. (Author), Hashimoto, O. (Author), Honda, S. (Author), Fu, J. N. (Author), Castanheira, B. (Author), Lehmann, H. (Author), Bognar, Zs. (Author), Behara, N. (Author), Scaringi, S. (Author), van Winckel, H. (Author), Menu, J. (Author), Lobel, A. (Author), Mathias, P. (Author), Saesen, S. (Author) and Vuckovic, M. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 438 (4), pp. 3535-3556 |
Number of Pages | 22 |
Year | 2014 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stt2466 |
Web Address (URL) | https://academic.oup.com/mnras/article/438/4/3535/1110113 |
Abstract | We carried out an extensive observational study of the Slowly Pulsating B (SPB) star, HD 25558. The ≈2000 spectra obtained at different observatories, the ground-based and MOST satellite light curves revealed that this object is a double-lined spectroscopic binary with an orbital period of about nine years. The observations do not allow the inference of an orbital solution. We determined the physical parameters of the components, and found that both lie within the SPB instability strip. Accordingly, both show line-profile variations due to stellar pulsations. 11 independent frequencies were identified in the data. All the frequencies were attributed to one of the two components based on pixel-by-pixel variability analysis of the line profiles. Spectroscopic and photometric mode identification was also performed for the frequencies of both stars. These results suggest that the inclination and rotation of the two components are rather different. The primary is a slow rotator with ≈6 d period, seen at ≈60° inclination, while the secondary rotates fast with ≈1.2 d period, and is seen at ≈20° inclination. Spectropolarimetric measurements revealed that the secondary component has a magnetic field with at least a few hundred Gauss strength, while no magnetic field can be detected in the primary. |
Keywords | asteroseismology, binaries spectroscopic, stars, individual HD 25558, stars magnetic field, stars oscillations, stars rotation |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Royal Observatory of Belgium |
University of New South Wales | |
University of Paris, France | |
University of Liege, Belgium | |
College of Charleston, United States | |
Tennessee State University, United States | |
University of Canterbury, New Zealand | |
University of British Columbia, Canada | |
University of Vienna, Austria | |
Catholic University Leuven, Belgium | |
National Astronomical Observatory of Japan, Japan | |
University of Johannesburg, South Africa | |
North-West University, South Africa | |
University of Victoria, Canada | |
Gunma Astronomical Observatory, Japan | |
Beijing Normal University, China | |
University of Texas, United States | |
Karl Schwarzschild Observatory, Germany | |
Konkoly Observatory, Hungary | |
Free University of Brussels, Belgium | |
Catholic University of Leuven, Belgium | |
University of Toulouse, France | |
University of Geneva, Switzerland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q53v3/extensive-study-of-hd-25558-a-long-period-double-lined-binary-with-two-spb-components
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