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NU Ori :
NU Ori : a hierarchical triple system with a strongly magnetic B-type star
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- Shultz, Matthew (författare)
- Uppsala universitet,Observationell astrofysik,Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA
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Le Bouquin, J. -B (författare)
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- Rivinius, Th. (författare)
- ESO European Org Astron Res Southern Hemisphere, Casilla 19001, Santiago 19, Chile
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- Wade, G. A. (författare)
- Royal Mil Coll Canada, Dept Phys & Space Sci, Kingston, ON K7K 7B4, Canada
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Observationell astrofysik
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- Alecian, E. (författare)
- Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France
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- Petit, V. (författare)
- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA
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- Pfuhl, O. (författare)
- Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Bayern, Germany
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- Karl, M. (författare)
- Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Bayern, Germany
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- Gao, F. (författare)
- Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Bayern, Germany
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- Grellmann, R. (författare)
- Univ Cologne, Phys Inst, Zulpicher Str 77, D-50397 Cologne, Germany
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Lin, C. -C (författare)
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- Garcia, P. (författare)
- Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France;Univ Lisbon, IST, Ctr Astrofis & Gravitacao, P-1049001 Lisbon, Portugal;Univ Porto, Fac Engn, Rua Dr Roberto Frias, P-4200465 Porto, Portugal
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- Lacour, S. (författare)
- CNRS, IPAG, F-38000 Grenoble, France
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(creator_code:org_t)
- 2018-11-03
- 2019
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 482:3, s. 3950-3965
- Relaterad länk:
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http://arxiv.org/pdf...
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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
- NU Ori is a massive spectroscopic and visual binary in the Orion Nebula Cluster, with four components: Aa, Ab, B, and C. The B0.5 primary (Aa) is one of the most massive B-type stars reported to host a magnetic field. We report the detection of a spectroscopic contribution from the C component in high-resolution ESPaDOnS spectra, which is also detected in a Very Large Telescope Interferometer data set. Radial velocity (RV) measurements of the inner binary (designated Aab) yield an orbital period of 14.3027(7) d. The orbit of the third component (designated C) was constrained using both RVs and interferometry. We find C to be on a mildly eccentric 476(1) d orbit. Thanks to spectral disentangling of mean line profiles obtained via least-squares deconvolution, we show that the Zeeman Stokes V signature is clearly associated with C, rather than Aa as previously assumed. The physical parameters of the stars were constrained using both orbital and evolutionary models, yielding M-Aa = 14.9 +/- 0.5 M-circle dot, M-Ab = 3.9 +/- 0.7 M-circle dot, and M-C = 7.8 +/- 0.7 M-circle dot. The rotational period obtained from longitudinal magnetic field (B-z) measurements is P-rot = 1.09468(7)d, consistent with previous results. Modelling of (B-z) indicates a surface dipole magnetic field strength of similar to 8 kG. NU Ori C has a magnetic field strength, rotational velocity, and luminosity similar to many other stars exhibiting magnetospheric Ha emission, and we find marginal evidence of emission at the expected level (similar to 1 per cent of the continuum).
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- binaries: close
- stars: early-type
- stars: individual: NU Ori
- stars: magnetic field
- stars: massive
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- Av författaren/redakt...
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Shultz, Matthew
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Le Bouquin, J. - ...
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Rivinius, Th.
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Wade, G. A.
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Kochukhov, Oleg
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Alecian, E.
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visa fler...
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Petit, V.
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Pfuhl, O.
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Karl, M.
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Gao, F.
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Grellmann, R.
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Lin, C. -C
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Garcia, P.
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Lacour, S.
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