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.

Basic information

Original name

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

Authors

KRTIČKA, Jiří (203 Czech Republic, guarantor, belonging to the institution), Adela KAWKA (203 Czech Republic), Zdeněk MIKULÁŠEK (203 Czech Republic, belonging to the institution), Luca FOSSATI (380 Italy), Iva KRTIČKOVÁ (203 Czech Republic, belonging to the institution), Milan PRVÁK (203 Czech Republic, belonging to the institution), Jan JANÍK (203 Czech Republic, belonging to the institution), Marek SKARKA (203 Czech Republic, belonging to the institution) and Richard LIPTAJ (703 Slovakia, belonging to the institution)

Edition

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

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 5.802

RIV identification code

RIV/00216224:14310/20:00114248

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1051/0004-6361/202037953

UT WoS

000547567700008

Keywords in English

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

Abstract

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.

Links

EF16_027/0008360, research and development project

Name: Postdoc@MUNI

GA18-05665S, research and development project

Name: Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

Investor: Czech Science Foundation

LM2018140, research and development project

Name: e-Infrastruktura CZ (Acronym: e-INFRA CZ)

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

KRTIČKA, Jiří, Adela KAWKA, Zdeněk MIKULÁŠEK, Luca FOSSATI, Iva KRTIČKOVÁ, Milan PRVÁK, Jan JANÍK, Marek SKARKA and 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, vol. 639, JUL 1 2020, p. 1-8. ISSN 0004-6361. Available from: https://dx.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 = {http://dx.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 and 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, vol.~639, JUL 1 2020, p.~1-8. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/202037953.

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