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Rotational and pulsational variability in the TESS light curve of HD 27463
Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada.
Mt Allison Univ, Dept Phys, Sackville, NB E4L 1E6, Canada.
Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada.
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 490, no 2, p. 2102-2111Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Oxford University Press, 2019. Vol. 490, no 2, p. 2102-2111
Keywords [en]
stars: magnetic field, stars: rotation, stars: oscillations, stars: fundamental parameters, stars: chemically peculiar, stars: individual: HD 27463
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-398584DOI: 10.1093/mnras/stz2782ISI: 000496926900045OAI: oai:DiVA.org:uu-398584DiVA, id: diva2:1376218
Funder
Swedish Research Council, 621-2014-5720Swedish National Space Board, 185/14Swedish National Space Board, 137/17EU, European Research Council, 670519: MAMSIEThe European Space Agency (ESA), PEA 4000119301Available from: 2019-12-09 Created: 2019-12-09 Last updated: 2019-12-09Bibliographically approved

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Kochukhov, Oleg

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