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The large-scale mag...
The large-scale magnetic field of the M dwarf double-line spectroscopic binary FK Aqr*
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- Tsvetkova, S. (författare)
- CNRS, LUPM UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier, France.;Univ Montpellier, Pl Eugene Bataillon, F-34095 Montpellier, France.;Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko shose, Sofia 1784, Bulgaria.;Bulgarian Acad Sci, NAO, 72 Tsarigradsko Shose, Sofia 1784, Bulgaria.
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- Morin, J. (författare)
- CNRS, LUPM UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier, France.;Univ Montpellier, Pl Eugene Bataillon, F-34095 Montpellier, France.
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- Folsom, C. P. (författare)
- Univ Tartu, Tartu Observ, Observatooriumi 1, EE-61602 Toravere, Estonia.
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Le Bouquin, J. -B (författare)
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- Alecian, E. (författare)
- Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France.
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- Bellotti, S. (författare)
- Univ Toulouse, UPS OMP, Inst Rech Astrophys & Planetol, CNRS,CNES, 14 Ave Edouard Belin, F-31400 Toulouse, France.;European Space Res & Technol Ctr ESA ESTEC, Directorate Sci, Sci Div, Kepleraan 1, NL-2201 AZ Noordwijk, Netherlands.
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- Hussain, G. (författare)
- European Space Res & Technol Ctr ESA ESTEC, Directorate Sci, Sci Div, Kepleraan 1, NL-2201 AZ Noordwijk, Netherlands.
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Marsden, S. C. (författare)
- Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia.
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- Neiner, C. (författare)
- Univ Paris Cite, Sorbonne Univ, PSL Univ, LESIA,Observ Paris,CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France.
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- Petit, P. (författare)
- Univ Toulouse, UPS OMP, Inst Rech Astrophys & Planetol, CNRS,CNES, 14 Ave Edouard Belin, F-31400 Toulouse, France.
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- Wade, G. A. (författare)
- Royal Mil Coll Canada, Dept Phys, POB 17000,Stn Forces, Kingston, ON K7K 4B4, Canada.
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CNRS, LUPM UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier, France;Univ Montpellier, Pl Eugene Bataillon, F-34095 Montpellier, France.;Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko shose, Sofia 1784, Bulgaria.;Bulgarian Acad Sci, NAO, 72 Tsarigradsko Shose, Sofia 1784, Bulgaria. CNRS, LUPM UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier, France.;Univ Montpellier, Pl Eugene Bataillon, F-34095 Montpellier, France. (creator_code:org_t)
- EDP Sciences, 2024
- 2024
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 682
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. This work is part of the BinaMIcS project, the aim of which is to understand the interaction between binarity and magnetism in close binary systems. All the studied spectroscopic binaries targeted by the BinaMIcS project encompass hot massive and intermediate-mass stars on the main sequence, as well as cool stars over a wide range of evolutionary stages. Aims. The present paper focuses on the binary system FK Aqr, which is composed of two early M dwarfs. Both stars are already known to be magnetically active based on their light curves and detected flare activity. In addition, the two components have large convective envelopes with masses just above the fully convective limit, making the system an ideal target for studying effect of binarity on stellar dynamos. Methods. We use spectropolarimetric observations obtained with ESPaDOnS at CFHT in September 2014. Mean Stokes I and V line profiles are extracted using the least-squares deconvolution (LSD) method. The radial velocities of the two components are measured from the LSD Stokes I profiles and are combined with interferometric measurements in order to constrain the orbital parameters of the system. The longitudinal magnetic fields B-l and chromospheric activity indicators are measured from the LSD mean line profiles. The rotational modulation of the Stokes V profiles is used to reconstruct the surface magnetic field structures of both stars via the Zeeman Doppler imaging (ZDI) inversion technique. Results. Maps of the surface magnetic field structures of both components of FK Aqr are presented for the first time. Our study shows that both components host similar large-scale magnetic fields of moderate intensity (B-mean similar or equal to 0.25 kG); both are predominantly poloidal and feature a strong axisymmetric dipolar component. Conclusions. Both components of FK Aqr feature a rather strong large-scale magnetic field (compared to single early M dwarfs with similar masses) with a mainly dipolar axisymmetric structure. This type of magnetic field is not typical for single early M dwarfs, and is rather reminiscent of fully convective dwarfs with later spectral types. The primary FK Aqr A is currently the most massive recognised main sequence M dwarf known to host this type of strong dipolar field.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- magnetic fields
- stars: activity
- binaries : close
- stars: individual: FK Aqr
- stars: low-mass
- stars: magnetic field
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Tsvetkova, S.
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Morin, J.
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Folsom, C. P.
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Le Bouquin, J. - ...
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Alecian, E.
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Bellotti, S.
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visa fler...
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Hussain, G.
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Kochukhov, Oleg
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Marsden, S. C.
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Neiner, C.
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Petit, P.
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Wade, G. A.
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visa färre...
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