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Detection of an ext...
Detection of an extremely strong magnetic field in the double-degenerate binary merger product HD 144941
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- Shultz, M. E. (författare)
- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA.
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Labadie-Bartz, J. (författare)
- Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226,Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil.
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- David-Uraz, A. (författare)
- Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA.;NASA GSFC, Ctr Res & Explorat Space Sci & Technol, Greenbelt, MD 20771 USA.;NASA GSFC, Xray Astrophys Lab, Greenbelt, MD 20771 USA.
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- Owocki, S. P. (författare)
- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA.
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Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA Institutionen för fysik och astronomi (creator_code:org_t)
- 2021-07-28
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 507:1, s. 1283-1295
- 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
- HD 144941 is an extreme He (EHe) star, a rare class of subdwarf OB star formed from the merger of two white dwarf (WD) stars. Uniquely amongst EHe stars, its light curve has been reported to be modulated entirely by rotation, suggesting the presence of a magnetic field. Here, we report the first high-resolution spectropolarimetric observations of HD 144941, in which we detect an extremely strong magnetic field both in circular polarization (with a line-of-sight magnetic field averaged over the stellar disc < B-z > similar to -8 kG) and in Zeeman splitting of spectral lines (yielding a magnetic modulus of < B > similar to 17 kG). We also report for the first time weak H alpha emission consistent with an origin and a centrifugal magnetosphere. HD 144941's atmospheric parameters could be consistent with either a subdwarf or a main-sequence (MS) star, and its surface abundances are neither similar to other EHe stars nor to He-strong magnetic stars. However, its H alpha emission properties can only be reproduced if its mass is around 1 M-circle dot, indicating that it must be a post-MS object. Since there is no indication of binarity, it is unlikely to be a stripped star, and was therefore most likely produced in a WD merger. HD 144941 is therefore further evidence that mergers are a viable pathway for the generation of fossil magnetic fields.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: chemically peculiar
- circumstellar matter
- stars: early-type
- stars: individual: HD 144941
- stars: magnetic field
- subdwarfs
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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