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Magnetic fields of ...
Magnetic fields of intermediate-mass T Tauri stars : I. Magnetic detections and fundamental stellar parameters
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- Villebrun, F. (författare)
- Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
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- Alecian, E. (författare)
- Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
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- Hussain, G. (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany;Univ Toulouse, IRAP, CNRS, CNES,UPS, F-31400 Toulouse, France
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- Bouvier, J. (författare)
- Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
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- Folsom, C. P. (författare)
- Univ Toulouse, IRAP, CNRS, CNES,UPS, F-31400 Toulouse, France
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- Lebreton, Y. (författare)
- PSL Res Univ, LESIA, Observ Paris, CNRS UMR 8109, 5 Pl Jules Janssen, F-92195 Meudon, France;Univ Rennes 1, Inst Phys Rennes, CNRS, UMR 6251, F-35042 Rennes, France
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- Amard, L. (författare)
- Univ Exeter, Dept Phys & Astron, Stoker Rd, Exeter EX4 4QL, Devon, England
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- Charbonnel, C. (författare)
- Univ Toulouse, IRAP, CNRS, CNES,UPS, F-31400 Toulouse, France;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland
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- Gallet, F. (författare)
- Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland
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- Haemmerle, L. (författare)
- Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland
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- Bohm, T. (författare)
- Univ Toulouse, IRAP, CNRS, CNES,UPS, F-31400 Toulouse, France
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- Johns-Krull, C. (författare)
- Rice Univ, Dept Phys & Astron, 6100 Main St,MS-108, Houston, TX 77005 USA
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Observationell astrofysik
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- Marsden, S. C. (författare)
- Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
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- Morin, J. (författare)
- Univ Montpellier, LUPM, Montpellier 05, France;CNRS, Montpellier 05, France
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- Petit, P. (författare)
- Univ Toulouse, IRAP, CNRS, CNES,UPS, F-31400 Toulouse, France
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(creator_code:org_t)
- 2019-01-30
- 2019
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 622
- Relaterad länk:
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https://www.aanda.or...
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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. The origin of the fossil magnetic fields detected in 5 to 10% of intermediate-mass main sequence stars is still highly debated.Aims. We want to bring observational constraints to a large population of intermediate-mass pre-main sequence (PMS) stars in order to test the theory that convective-dynamo fields generated during the PMS phases of stellar evolution can occasionally relax into fossil fields on the main sequence.Methods. Using distance estimations, photometric measurements, and spectropolarimetric data from HARPSpol and ESPaDOnS of 38 intermediate-mass PMS stars, we determined fundamental stellar parameters (T-eff, L and v sin i) and measured surface magnetic field characteristics (including detection limits for non-detections, and longitudinal fields and basic topologies for positive detections). Using PMS evolutionary models, we determined the mass, radius, and internal structure of these stars. We compared different PMS models to check that our determinations were not model-dependant. We then compared the magnetic characteristics of our sample accounting for their stellar parameters and internal structures.Results. We detect magnetic fields in about half of our sample. About 90% of the magnetic stars have outer convective envelopes larger than similar to 25% of the stellar radii, and heavier than similar to 2% of the stellar mass. Going to higher mass, we find that the magnetic incidence in intermediate-mass stars drops very quickly, within a timescale on the order of few times 0.1 Myr. Finally, we propose that intermediate-mass T Tauri stars with large convective envelopes, close to the fully convective limit, have complex fields and that their dipole component strengths may decrease as the sizes of their convective envelopes decrease, similar to lower-mass T Tauri stars.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: activity
- stars: fundamental parameters
- stars: magnetic field
- stars: pre-main sequence
- stars: variables: T Tauri
- Herbig Ae/Be
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- art (ämneskategori)
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Villebrun, F.
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Alecian, E.
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Hussain, G.
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Bouvier, J.
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Folsom, C. P.
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Lebreton, Y.
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visa fler...
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Amard, L.
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Charbonnel, C.
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Gallet, F.
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Haemmerle, L.
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Bohm, T.
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Johns-Krull, C.
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Kochukhov, Oleg
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Marsden, S. C.
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Morin, J.
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Petit, P.
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