| 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. |
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@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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