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Confirmation of ξ1 ...
Confirmation of ξ1 CMa’s ultra-slow rotation : magnetic polarity reversal and a dramatic change in magnetospheric UV emission lines
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- Erba, C. (författare)
- Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA.
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- Shultz, M. E. (författare)
- Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA.
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- Petit, V (författare)
- Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA.
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- Fullerton, A. W. (författare)
- Space Telescope Sci Inst, Baltimore, MD 21218 USA.
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- Henrichs, H. F. (författare)
- Univ Amsterdam, Anton Pannekoek Inst Astron, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands.
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Rivinius, T. (författare)
- European Org Astron Res Southern Hemisphere ESO, Casilla 19001, Santiago 19, Chile.
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- Wade, G. A. (författare)
- Royal Mil Coll Canada, Dept Phys & Space Sci, Stn Forces, POB 17000, Kingston, ON K7K 0C6, Canada.
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Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA Space Telescope Sci Inst, Baltimore, MD 21218 USA. (creator_code:org_t)
- 2021-05-25
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 506:2, s. 2296-2308
- 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
- The magnetic beta Cep pulsator xi(1) CMa has the longest rotational period of any known magnetic B-type star. It is also the only magnetic B-type star with magnetospheric emission that is known to be modulated by both rotation and pulsation. We report here the first unambiguous detection of a negative longitudinal magnetic field in xi(1) CMa (< B-z > = -87 +/- 2 G in 2019 and < B-z > = -207 +/- 3 G in 2020), as well as the results of ongoing monitoring of the star's H alpha variability. We examine evidence for deviation from a purely dipolar topology. We also report a new HST UV spectrum of xi(1) CMa obtained near magnetic null that is consistent with an equatorial view of the magnetosphere, as evidenced by its similarity to the UV spectrum of beta Cep obtained near maximum emission. The new UV spectrum of xi(1) CMa provides additional evidence for the extremely long rotation period of this star via comparison to archival data.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- techniques: polarimetric
- stars: early-type
- stars: individual: xi(1) CMa
- stars: magnetic field
- stars: massive
- ultraviolet: stars
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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