The nature of the photometric variability of HgMn stars: a test of simulated light curves of phi Phe against the TESS data

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114493" target="_blank" >RIV/00216224:14310/20:00114493 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/stz3564" target="_blank" >https://doi.org/10.1093/mnras/stz3564</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stz3564" target="_blank" >10.1093/mnras/stz3564</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The nature of the photometric variability of HgMn stars: a test of simulated light curves of phi Phe against the TESS data

Popis výsledku v původním jazyce

The inhomogeneous surface distribution of heavy elements is known to cause periodic light variability of magnetic chemically peculiar stars. It is unclear to what extent the same paradigm applies to mercury-manganese (HgMn)stars. We aim to model the photometric variability of the HgMn star phi Phe using abundance maps obtained from high-resolution spectroscopy and to study how this variability evolves with time. We compute a grid of ATLAS12 model atmospheres and the corresponding SYNSPEC synthetic spectra. Interpolating within this grid and integrating the specific intensity over the visible stellar surface at different rotational phases, we obtain theoretical light curves of the star. We predict the variability of phi Phe in the ultraviolet and in the visible spectral regions with amplitude of the order of millimagnitudes, mainly caused by absorption in lines of yttrium, chromium, and titanium. We also show how this variability is affected by changes of the distribution of the heavy elements over time. The main characteristics of the predicted light variability of phi Phe correspond roughly to the variability of the star observed with the Transiting Exoplanet Survey Satellite (TESS).

Název v anglickém jazyce

The nature of the photometric variability of HgMn stars: a test of simulated light curves of phi Phe against the TESS data

Popis výsledku anglicky

The inhomogeneous surface distribution of heavy elements is known to cause periodic light variability of magnetic chemically peculiar stars. It is unclear to what extent the same paradigm applies to mercury-manganese (HgMn)stars. We aim to model the photometric variability of the HgMn star phi Phe using abundance maps obtained from high-resolution spectroscopy and to study how this variability evolves with time. We compute a grid of ATLAS12 model atmospheres and the corresponding SYNSPEC synthetic spectra. Interpolating within this grid and integrating the specific intensity over the visible stellar surface at different rotational phases, we obtain theoretical light curves of the star. We predict the variability of phi Phe in the ultraviolet and in the visible spectral regions with amplitude of the order of millimagnitudes, mainly caused by absorption in lines of yttrium, chromium, and titanium. We also show how this variability is affected by changes of the distribution of the heavy elements over time. The main characteristics of the predicted light variability of phi Phe correspond roughly to the variability of the star observed with the Transiting Exoplanet Survey Satellite (TESS).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA18-05665S" target="_blank" >GA18-05665S: Ztráta hmoty v pozdních fázích vývoje hmotných hvězd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

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

1365-2966

Svazek periodika

492

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

1834-1840

Kód UT WoS článku

000512297600022

EID výsledku v databázi Scopus

2-s2.0-85082659149