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