Rotational and pulsational variability in the TESS light curve of HD 27463

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Rotational and pulsational variability in the TESS light curve of HD 27463

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Rotational and pulsational variability in the TESS light curve of HD 27463

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

490

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

2102-2111

Kód UT WoS článku

000496926900045

EID výsledku v databázi Scopus

2-s2.0-85079597243