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τ9Eri :
τ9Eri : a bright pulsating magnetic Bp star in a 5.95-d double-lined spectroscopic binary
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- Woodcock, K. (författare)
- Royal Mil Coll Canada, Dept Phys & Space Sci, POB 17000 Stn Forces, Kingston, ON K7K 0C6, Canada.
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- Wade, G. A. (författare)
- Royal Mil Coll Canada, Dept Phys & Space Sci, POB 17000 Stn Forces, Kingston, ON K7K 0C6, Canada.
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Observationell astrofysik
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- Sikora, J. (författare)
- Bishops Univ, Dept Phys & Astron, Sherbrooke, PQ J1M 1Z7, Canada.
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- Pigulski, A. (författare)
- Univ Wroclaw, Astron Inst, Kopernika 11, PL-51622 Wroclaw, Poland.
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Royal Mil Coll Canada, Dept Phys & Space Sci, POB 17000 Stn Forces, Kingston, ON K7K 0C6, Canada Observationell astrofysik (creator_code:org_t)
- 2021-02-09
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 502:4, s. 5200-5209
- Relaterad länk:
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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
- tau(9)Eri is a Bp star that was previously reported to be a single-lined spectroscopic binary. Using 17 ESPaDOnS spectropolarimetric (Stokes V) observations, we identified the weak spectral lines of the secondary component and detected a strong magnetic field in the primary. We performed orbital analysis of the radial velocities of both components to find a slightly eccentric orbit (e = 0.129) with a period of 5.95382(2) d. The longitudinal magnetic field (B-l) of the primary was measured from each of the Stokes V profiles, with typical error bars smaller than 10 G. Equivalent widths (EWs) of least-squares deconvolution profiles corresponding to only the Fe lines were also measured. We performed frequency analysis of both the B-l and EW measurements, as well as of the Hipparcos, SMEI, and TESS photometric data. All sets of photometric observations produce two clear, strong candidates for the rotation period of the Bp star: 1.21 and 3.82 d. The B-l and EW measurements are consistent with only the 3.82-d period. We conclude that HD25267 consists of a late-type Bp star (M = 3.6(-0.2)(+0.1)M(circle dot), T = 12580(-120)(+150) K) with a rotation period of 3.82262(4) d orbiting with a period of 5.95382(2) d with a late-A/early-F type secondary companion (M = 1.6 +/- 0.1 M-circle dot, T = 7530(-510)(+580) K). The Bp star's magnetic field is approximately dipolar with i = 41 +/- 2 degrees, beta = 158 +/- 5 degrees, and B-d = 1040 +/- 50 G. All evidence points to the strong 1.209912(3)-d period detected in photometry, along with several other weaker photometric signals, as arising from g-mode pulsations in the primary.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- binaries: spectroscopic
- stars: chemically peculiar
- stars: early-type
- stars: individual: HD 25267
- stars: magnetic field
- stars: oscillations
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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