Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F13%3A00066262" target="_blank" >RIV/00216224:14310/13:00066262 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1051/0004-6361/201221018" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201221018</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201221018" target="_blank" >10.1051/0004-6361/201221018</a>
Alternative languages
Result language
angličtina
Original language name
Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740
Original language description
The light variability of hot magnetic chemically peculiar stars is typically caused by the flux redistribution in spots with peculiar abundance. This raises the question why some stars with surface abundance spots show significant rotational light variability, while others do not. Aims: We study the Bp star HD 64740 to investigate how its remarkable inhomogeneities in the surface distribution of helium and silicon, and the corresponding strong variability of many spectral lines, can result in one of thefaintest photometric variabilities among the Bp stars. Methods: We used model atmospheres and synthetic spectra calculated for the silicon and helium abundances from surface abundance maps to predict the ultraviolet and visual light and line variabilityof HD 64740. The predicted fluxes and line profiles were compared with the observed ones derived with the IUE, HST, and Hipparcos satellites and with spectra acquired using the FEROS spectrograph at the 2.2 m MPG/ESO telescope in La Sill
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GAP209%2F12%2F0217" target="_blank" >GAP209/12/0217: Multispectral variability of hot stars and its nature</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy and Astrophysics
ISSN
0004-6361
e-ISSN
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Volume of the periodical
556
Issue of the periodical within the volume
léto
Country of publishing house
FR - FRANCE
Number of pages
11
Pages from-to
"A18"-"1"-"A18"-"11"
UT code for WoS article
000323893500018
EID of the result in the Scopus database
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