Distorted surfaces of magnetic helium-peculiar stars: an application to a Cen
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114466" target="_blank" >RIV/00216224:14310/20:00114466 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/staa378" target="_blank" >https://doi.org/10.1093/mnras/staa378</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staa378" target="_blank" >10.1093/mnras/staa378</a>
Alternative languages
Result language
angličtina
Original language name
Distorted surfaces of magnetic helium-peculiar stars: an application to a Cen
Original language description
Helium-peculiar magnetic chemically peculiar stars show variations of helium abundance across their surfaces. As a result of associated atmospheric scale height variations, the stellar surface becomes distorted, with helium-rich regions dented inwards. Effectively, on top of flux variations due to opacity effects, the depressed helium-rich surface regions become less bright in the optical regions and brighter in the ultraviolet. We study the observational effects of the aspherical surface on the light curves of a Cen. We simulate the light curves of this star adopting surface distributions of He, N, O, Si, and Fe derived from Doppler mapping and introducing the effect of distortion proportional to helium abundance. We show that while most of the optical and UV variations of this star result from flux redistribution due to the non-uniform surface distributions of helium and iron, the reduction of light variations due to the helium-related surface distortion leads to a better agreement between simulated optical light curves and the light curves observed with the BRITE satellites.
Czech name
—
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
<a href="/en/project/GA18-05665S" target="_blank" >GA18-05665S: Mass-loss in evolved massive stars</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
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
493
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
9
Pages from-to
2140-2148
UT code for WoS article
000525996700042
EID of the result in the Scopus database
2-s2.0-85089565664