HD 34736: an intensely magnetised double-lined spectroscopic binary with rapidly rotating chemically peculiar B-type components

ABSTRACT We report the results of a comprehensive study of the spectroscopic binary (SB2) system HD 34736 hosting two chemically peculiar (CP) late B-type stars. Using new and archival observational data, we characterize the system and its components, including their rotation and magnetic fields. Fitting of the radial velocities yields $P_\mathrm{orb}=83\rm{.\!\!^{ {\rm{d}}}}219(3)$ and $e=0.8103(3)$. The primary component is a CP He-wk star with $T_{{\rm eff}A}$$\,\,=13000\pm 500$ K and $\upsilon _{\rm e}\sin i\,$$\,\,=75\pm 3$ km s$^{-1}\,$, while the secondary exhibits variability of Mg and Si lines, and has $T_{{\rm eff}B}$$\,\,=11500\pm 1000$ K and $\upsilon _{\rm e}\sin i\,$$\,\,=110$–180 km s$^{-1}\,$. Transiting Exoplanet Survey Satellite and Kilodegree Extremely Little Telescope photometry reveal clear variability of the primary component with a rotational period $P_{\mathrm{rot}A}=1\rm{.\!\!^{ {\rm{d}}}}279\, 988\, 5(11)$, which is lengthening at a rate of 1.26(6) s yr$^{-1}$. For the secondary, $P_{\mathrm{rot}B}=0\rm{.\!\!^{ {\rm{d}}}}522\, 693\, 8(5)$, reducing at a rate of $-0.14(3)$ s yr$^{-1}$. The longitudinal component $\langle B_{\rm z}\rangle$ of the primary’s strongly asymmetric global magnetic field varies from $-6$ to +5 kG. Weak spectropolarimetric evidence of a magnetic field is found for the secondary star. The observed X-ray and radio emission of HD 34736 may equally be linked to a suspected T Tau-like companion or magnetospheric emission from the principal components. Given the presence of a possible third magnetically active body, one can propose that the magnetic characteristics of the protostellar environment may be connected to the formation of such systems.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-11-06
DOI
https://doi.org/10.1093/mnras/stae2503
Citations
3
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
0.99

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article

HD 34736: an intensely magnetised double-lined spectroscopic binary with rapidly rotating chemically peculiar B-type components

G. A. Wade, Miloslav Zejda, M. E. Shultz, Zdeněk Mikulášek et al.
3 citations
Monthly Notices of the Royal Astronomical Society
Stellar, planetary, and galactic studies
0.99
article

HD 34736: an intensely magnetised double-lined spectroscopic binary with rapidly rotating chemically peculiar B-type components

G. A. Wade, Miloslav Zejda, M. E. Shultz, Zdeněk Mikulášek, Dax L. Feliz, D. O. Kudryavtsev, Jiřı́ Krtička, V. Pétit, E. Alécian, Jonathan Labadie-Bartz, Е. А. Семенко, D. Shulyak, Ján Janík, D. E. Mkrtichian, I. I. Romanyuk, O. Kochukhov, Jan Kolář, I. A. Yakunin, D. Bohlender, Robert J. Siverd, A. Tkachenko, D. Monin, Barnali Das
article en
3 citations

Abstract

ABSTRACT We report the results of a comprehensive study of the spectroscopic binary (SB2) system HD 34736 hosting two chemically peculiar (CP) late B-type stars. Using new and archival observational data, we characterize the system and its components, including their rotation and magnetic fields. Fitting of the radial velocities yields $P_\mathrm{orb}=83\rm{.\!\!^{ {\rm{d}}}}219(3)$ and $e=0.8103(3)$. The primary component is a CP He-wk star with $T_{{\rm eff}A}$$\,\,=13000\pm 500$ K and $\upsilon _{\rm e}\sin i\,$$\,\,=75\pm 3$ km s$^{-1}\,$, while the secondary exhibits variability of Mg and Si lines, and has $T_{{\rm eff}B}$$\,\,=11500\pm 1000$ K and $\upsilon _{\rm e}\sin i\,$$\,\,=110$–180 km s$^{-1}\,$. Transiting Exoplanet Survey Satellite and Kilodegree Extremely Little Telescope photometry reveal clear variability of the primary component with a rotational period $P_{\mathrm{rot}A}=1\rm{.\!\!^{ {\rm{d}}}}279\, 988\, 5(11)$, which is lengthening at a rate of 1.26(6) s yr$^{-1}$. For the secondary, $P_{\mathrm{rot}B}=0\rm{.\!\!^{ {\rm{d}}}}522\, 693\, 8(5)$, reducing at a rate of $-0.14(3)$ s yr$^{-1}$. The longitudinal component $\langle B_{\rm z}\rangle$ of the primary’s strongly asymmetric global magnetic field varies from $-6$ to +5 kG. Weak spectropolarimetric evidence of a magnetic field is found for the secondary star. The observed X-ray and radio emission of HD 34736 may equally be linked to a suspected T Tau-like companion or magnetospheric emission from the principal components. Given the presence of a possible third magnetically active body, one can propose that the magnetic characteristics of the protostellar environment may be connected to the formation of such systems.

Monthly Notices of the Royal Astronomical SocietyVol. 535(3)
Uppsala University (SE), Herzberg Institute of Astrophysics (CA), Commonwealth Scientific and Industrial Research Organisation (AU), Centre National de la Recherche Scientifique (FR), University of Hawaii System (US), American Museum of Natural History (US), Janssen (Belgium) (BE), St Petersburg University (RU), Université Paris Cité (FR), Masaryk University (CZ), Université Paris Sciences et Lettres (FR), Special Astrophysical Observatory (RU), Observatoire de Paris (FR), Sorbonne Université (FR), Laboratoire d’études spatiales et d’instrumentation en astrophysique (FR), Institute of Astronomy (RU), Astronomy and Space (AU), Instituto de Astrofísica de Andalucía (ES), Royal Military College of Canada (CA), National Astronomical Research Institute of Thailand (TH), University of Delaware (US), Université Grenoble Alpes (FR), KU Leuven (BE)
Smithsonian Institution, National Aeronautics and Space Administration, Vanderbilt University, Ohio State University, Lehigh University, University of Hawai'i, California Earthquake Authority, Royal Swedish Academy of Sciences, Eberhard Karls Universität Tübingen, Belgian Federal Science Policy Office, Centre National d’Etudes Spatiales, Fonds Wetenschappelijk Onderzoek, KU Leuven, Max-Planck-Gesellschaft, Vetenskapsrådet, Onderzoeksraad, KU Leuven, Ministerstwo Edukacji i Nauki, Centre National de la Recherche Scientifique, Universität Hamburg, Russian Science Foundation, Rheinische Friedrich-Wilhelms-Universität Bonn, Masarykova Univerzita, Vlaamse regering, Ministry of Science and Higher Education of the Russian Federation, Leibniz-Institut für Astrophysik Potsdam, Museum Conservation Institute, Smithsonian Astrophysical Observatory, Science Mission Directorate, Natural Sciences and Engineering Research Council of Canada, Leibniz-Gemeinschaft, Russian Academy of Sciences, Institut national des sciences de l'Univers, Agencia Estatal de Investigación
Openalex Percentile: Top 23%
Stellar, planetary, and galactic studies
0.99
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