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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

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • 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