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

J 2020

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

KRTIČKA, Jiří; Adela KAWKA; Zdeněk MIKULÁŠEK; Luca FOSSATI; Iva KRTIČKOVÁ et al.

Základní údaje

Originální název

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

Autoři

KRTIČKA, Jiří; Adela KAWKA; Zdeněk MIKULÁŠEK; Luca FOSSATI; Iva KRTIČKOVÁ; Milan PRVÁK; Jan JANÍK ; Marek SKARKA a Richard LIPTAJ

Vydání

Astronomy & Astrophysics, LES ULIS CEDEX A, EDP SCIENCES S A, 2020, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.803

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/20:00114248

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: variables: general; stars: chemically peculiar; stars: horizontal-branch; stars: atmospheres; stars: early-type

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 4. 1. 2021 14:50, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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.

Návaznosti

EF16_027/0008360, projekt VaV

Název: Postdoc@MUNI

GA18-05665S, projekt VaV

Název: Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

Investor: Grantová agentura ČR, Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

LM2018140, projekt VaV

Název: e-Infrastruktura CZ (Akronym: e-INFRA CZ)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, e-Infrastruktura CZ

Citovat

KRTIČKA, Jiří; Adela KAWKA; Zdeněk MIKULÁŠEK; Luca FOSSATI; Iva KRTIČKOVÁ; Milan PRVÁK; Jan JANÍK; Marek SKARKA a Richard LIPTAJ. Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366? Astronomy & Astrophysics. LES ULIS CEDEX A: EDP SCIENCES S A, 2020, roč. 639, JUL 1 2020, s. 1-8. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/202037953.

@article{1672247,
   author = {Krtička, Jiří and Kawka, Adela and Mikulášek, Zdeněk and Fossati, Luca and Krtičková, Iva and Prvák, Milan and Janík, Jan and Skarka, Marek and Liptaj, Richard},
   article_location = {LES ULIS CEDEX A},
   article_number = {JUL 1 2020},
   doi = {https://doi.org/10.1051/0004-6361/202037953},
   keywords = {stars: variables: general; stars: chemically peculiar; stars: horizontal-branch; stars: atmospheres; stars: early-type},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy & Astrophysics},
   title = {Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366?},
   url = {https://www.aanda.org/articles/aa/abs/2020/07/aa37953-20/aa37953-20.html},
   volume = {639},
   year = {2020}
}

TY  - JOUR
ID  - 1672247
AU  - Krtička, Jiří - Kawka, Adela - Mikulášek, Zdeněk - Fossati, Luca - Krtičková, Iva - Prvák, Milan - Janík, Jan - Skarka, Marek - Liptaj, Richard
PY  - 2020
TI  - Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366?
JF  - Astronomy & Astrophysics
VL  - 639
IS  - JUL 1 2020
SP  - 1-8
EP  - 1-8
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - stars: variables: general
KW  - stars: chemically peculiar
KW  - stars: horizontal-branch
KW  - stars: atmospheres
KW  - stars: early-type
UR  - https://www.aanda.org/articles/aa/abs/2020/07/aa37953-20/aa37953-20.html
L2  - https://www.aanda.org/articles/aa/abs/2020/07/aa37953-20/aa37953-20.html
N2  - 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.
ER  -

KRTIČKA, Jiří; Adela KAWKA; Zdeněk MIKULÁŠEK; Luca FOSSATI; Iva KRTIČKOVÁ; Milan PRVÁK; Jan JANÍK; Marek SKARKA a Richard LIPTAJ. Understanding the rotational variability of K2 targets: HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366? \textit{Astronomy \&{} Astrophysics}. LES ULIS CEDEX A: EDP SCIENCES S A, 2020, roč.~639, JUL 1 2020, s.~1-8. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/202037953.

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