Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114248" target="_blank" >RIV/00216224:14310/20:00114248 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.aanda.org/articles/aa/abs/2020/07/aa37953-20/aa37953-20.html" target="_blank" >https://www.aanda.org/articles/aa/abs/2020/07/aa37953-20/aa37953-20.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202037953" target="_blank" >10.1051/0004-6361/202037953</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366?

Popis výsledku v původním jazyce

Context. Ultraprecise space photometry enables us to reveal light variability even in stars that were previously deemed constant. A large group of such stars show variations that may be rotationally modulated. This type of light variability is of special interest because it provides precise estimates of rotational rates.Aims. We aim to understand the origin of the light variability of K2 targets that show signatures of rotational modulation.Methods. We used phase-resolved medium-resolution X-shooter spectroscopy to understand the light variability of the stars KIC 250152017 and KIC 249660366, which are possibly rotationally modulated. We determined the atmospheric parameters at individual phases and tested the presence of the rotational modulation in the spectra.Results. KIC 250152017 is a HgMn star, whose light variability is caused by the inhomogeneous surface distribution of manganese and iron. It is only the second HgMn star whose light variability is well understood. KIC 249660366 is a He-weak, high-velocity horizontal branch star with overabundances of silicon and argon. The light variability of this star is likely caused by a reflection effect in this post-common envelope binary.

Název v anglickém jazyce

Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366?

Popis výsledku anglicky

Context. Ultraprecise space photometry enables us to reveal light variability even in stars that were previously deemed constant. A large group of such stars show variations that may be rotationally modulated. This type of light variability is of special interest because it provides precise estimates of rotational rates.Aims. We aim to understand the origin of the light variability of K2 targets that show signatures of rotational modulation.Methods. We used phase-resolved medium-resolution X-shooter spectroscopy to understand the light variability of the stars KIC 250152017 and KIC 249660366, which are possibly rotationally modulated. We determined the atmospheric parameters at individual phases and tested the presence of the rotational modulation in the spectra.Results. KIC 250152017 is a HgMn star, whose light variability is caused by the inhomogeneous surface distribution of manganese and iron. It is only the second HgMn star whose light variability is well understood. KIC 249660366 is a He-weak, high-velocity horizontal branch star with overabundances of silicon and argon. The light variability of this star is likely caused by a reflection effect in this post-common envelope binary.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

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

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

—

Svazek periodika

639

Číslo periodika v rámci svazku

JUL 1 2020

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

8

Strana od-do

1-8

Kód UT WoS článku

000547567700008

EID výsledku v databázi Scopus

2-s2.0-85087864657