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Rotational and puls...
Rotational and pulsational variability in the TESS light curve of HD 27463
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- Khalack, V. (författare)
- Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada
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- Lovekin, C. (författare)
- Mt Allison Univ, Dept Phys, Sackville, NB E4L 1E6, Canada
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- Bowman, D. M. (författare)
- Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium
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- Kobzar, O. (författare)
- Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada
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- David-Uraz, A. (författare)
- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA
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- Paunzen, E. (författare)
- Masaryk Univ, Dept Theoret Phys & Astrophys, Kotlarska 2, CS-61137 Brno, Czech Republic
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- Sikora, J. (författare)
- Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada;Royal Mil Coll Canada, Dept Phys & Space Phys, POB 17000, Kingston, ON K7K 7B4, Canada
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- Lenz, P. (författare)
- Ronin Inst, Montclair, NJ 07043 USA
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Holdsworth, D. L. (författare)
- Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
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- Wade, G. A. (författare)
- Royal Mil Coll Canada, Dept Phys & Space Phys, POB 17000, Kingston, ON K7K 7B4, Canada
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(creator_code:org_t)
- 2019-10-19
- 2019
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 490:2, s. 2102-2111
- Relaterad länk:
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http://clok.uclan.ac...
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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 new photometric data on pulsating Ap star HD 27463 obtained recently with the Transiting Lroplanet Survey Satellite (TESS) are analysed to search for variability. Our analysis shows that HD 27463 exhibits two types of photometric variability. The low -frequency variability with the period P = 2.834 274 +/- 0.000 008 d can be explained in terms of axial stellar rotation assuming the oblique magnetic rotator model and presence of surface abundance/brightness spots, while the detected high -frequency variations are characteristics of fi Scud pulsations. From the analysis of Balmer line profiles visible in Iwo FEROS spectra of HI) 27463 we have derived its effective temperature and surface gravity, finding values that are close to those published for this star in the TESS Input Catalogue (TIC). Knowing the rotation period and the v sin i value estimated from the fitting of Balmer line profiles we found that the rotational axis is inclined to the line of sight with an angle of i = 33 +/- 8 deg. Our best -fitting model of the observed pulsation modes results in an overshoot parameter value = 0.014 and values of global stellar parameters that are in good agreement with the data reported in the TIC and with the data derived from fitting Balmer line profiles. This model indicates an age of 5.0 +/- 0.4 x 10(8) yr, which corresponds to a core hydrogen fraction of 0.33.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: magnetic field
- stars: rotation
- stars: oscillations
- stars: fundamental parameters
- stars: chemically peculiar
- stars: individual: HD 27463
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Khalack, V.
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Lovekin, C.
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Bowman, D. M.
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Kobzar, O.
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David-Uraz, A.
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Paunzen, E.
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visa fler...
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Sikora, J.
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Lenz, P.
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Kochukhov, Oleg
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Holdsworth, D. L ...
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Wade, G. A.
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visa färre...
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