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@article{1711416,
author = {Mikulášek, Zdeněk and Paunzen, Ernst and Hummerich, S. and Niemczura, E. and Walczak, P. and Fraga, L. and Bernhard, K. and Janík, Jan and Hubrig, S. and Jarvinen, S. and Jagelka, Miroslav and Pintado, O. I. and Krtička, Jiří and Prišegen, Michal and Skarka, Marek and Zejda, Miloslav and Ilyin, I. and Pribulla, T. and Kaminski, K. and Kaminska, M. K. and Tokarek, J. and Zielinski, P.},
article_location = {Oxford},
article_number = {1},
doi = {http://dx.doi.org/10.1093/mnras/staa2433},
keywords = {stars: chemically peculiar; variables: General; binaries: close; stars: individual: HD174356},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Rotational modulation and single g-mode pulsation in the B9pSi star HD 174356?},
url = {https://doi.org/10.1093/mnras/staa2433},
volume = {498},
year = {2020}
}
TY - JOUR
ID - 1711416
AU - Mikulášek, Zdeněk - Paunzen, Ernst - Hummerich, S. - Niemczura, E. - Walczak, P. - Fraga, L. - Bernhard, K. - Janík, Jan - Hubrig, S. - Jarvinen, S. - Jagelka, Miroslav - Pintado, O. I. - Krtička, Jiří - Prišegen, Michal - Skarka, Marek - Zejda, Miloslav - Ilyin, I. - Pribulla, T. - Kaminski, K. - Kaminska, M. K. - Tokarek, J. - Zielinski, P.
PY - 2020
TI - Rotational modulation and single g-mode pulsation in the B9pSi star HD 174356?
JF - Monthly Notices of the Royal Astronomical Society
VL - 498
IS - 1
SP - 548-564
EP - 548-564
PB - Oxford University Press
SN - 00358711
KW - stars: chemically peculiar
KW - variables: General
KW - binaries: close
KW - stars: individual: HD174356
UR - https://doi.org/10.1093/mnras/staa2433
L2 - https://doi.org/10.1093/mnras/staa2433
N2 - Chemically peculiar (CP) stars of the upper main sequence are characterized by specific anomalies in the photospheric abundances of some chemical elements. The group of CP2 stars, which encompasses classical Ap and Bp stars, exhibits strictly periodic light, spectral, and spectropolarimetric variations that can be adequately explained by themodel of a rigidly rotating star with persistent surface structures and a stable global magnetic field. Using observations from the Kepler K2 mission, we find that the B9pSi star HD174356 displays a light curve variable in both amplitude and shape, which is not expected in a CP2 star. Employing archival and new photometric and spectroscopic observations, we carry out a detailed abundance analysis of HD174356 and discuss its photometric and astrophysical properties in detail. We employ phenomenological modelling to decompose the light curve and the observed radial velocity variability. Our abundance analysis confirms that HD174356 is a silicon-type CP2 star. No magnetic field stronger than 110G was found. The star's light curve can be interpreted as the sum of two independent strictly periodic signals with P-1 = 4(.)(d) 043 55(5) and P-2 = 2(.)(d) 111 69(3). The periods have remained stable over 17 yr of observations. In all spectra, HD174356 appears to be single-lined. From the simulation of the variability characteristics and investigation of stars in the close angular vicinity, we put forth the hypothesis that the peculiar light variability of HD174356 arises in a single star and is caused by rotational modulation due to surface abundance patches (P-1) and g-mode pulsation (P-2).
ER -
MIKULÁŠEK, Zdeněk, Ernst PAUNZEN, S. HUMMERICH, E. NIEMCZURA, P. WALCZAK, L. FRAGA, K. BERNHARD, Jan JANÍK, S. HUBRIG, S. JARVINEN, Miroslav JAGELKA, O. I. PINTADO, Jiří KRTIČKA, Michal PRIŠEGEN, Marek SKARKA, Miloslav ZEJDA, I. ILYIN, T. PRIBULLA, K. KAMINSKI, M. K. KAMINSKA, J. TOKAREK a P. ZIELINSKI. Rotational modulation and single g-mode pulsation in the B9pSi star HD 174356? \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: Oxford University Press, roč.~498, č.~1, s.~548-564. ISSN~0035-8711. doi:10.1093/mnras/staa2433. 2020.
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