Rotational and pulsational variability in the TESS light curve of HD 27463
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00113435" target="_blank" >RIV/00216224:14310/19:00113435 - isvavai.cz</a>
Result on the web
<a href="https://arxiv.org/pdf/1910.00512.pdf" target="_blank" >https://arxiv.org/pdf/1910.00512.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stz2782" target="_blank" >10.1093/mnras/stz2782</a>
Alternative languages
Result language
angličtina
Original language name
Rotational and pulsational variability in the TESS light curve of HD 27463
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
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Volume of the periodical
490
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
2102-2111
UT code for WoS article
000496926900045
EID of the result in the Scopus database
2-s2.0-85079597243