Rotational modulation and single g-mode pulsation in the B9pSi star HD 174356?
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114586" target="_blank" >RIV/00216224:14310/20:00114586 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/staa2433" target="_blank" >https://doi.org/10.1093/mnras/staa2433</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staa2433" target="_blank" >10.1093/mnras/staa2433</a>
Alternative languages
Result language
angličtina
Original language name
Rotational modulation and single g-mode pulsation in the B9pSi star HD 174356?
Original language description
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).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
498
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
548-564
UT code for WoS article
000587741300039
EID of the result in the Scopus database
2-s2.0-85096979564