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Surface Mapping of the he & SI Distribution of Four B Stars
Briquet, Maryline; Luftinger, Teresa; Aerts, Conny et al.
2003In Astrotomography, 25th meeting of the IAU, Joint Discussion 9, 17 July 2003, Sydney, Australia
 

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Abstract :
[en] In the framework of a long-term high-resolution spectroscopic monitoring campaign of slowly pulsating B stars we have discovered four spotted mid-B main-sequence stars exhibiting clear line-profile variability of selected He and Si lines. We derive the rotational period which is of the order of 1-2 days of these stars with a high precision. We perform surface mapping which allows us to derive the distribution of the helium and silicon on the stellar surface. We find evidence for the presence of large spots in all four stars. He overabundance is accompanied with Si underabundance or vice versa in the spots. Our data are usefull to test current diffusion theories which have been developed for spotted A-type stars. Our stars have effective temperatures around 17000K which makes them among the hottest known so far with such clear spotted patterns. It would be most valuable to have magnetic field measurements for the four stars in order to explain the surface element distribution.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Briquet, Maryline ;  KULeuven > Instituut voor Sterrenkunde
Luftinger, Teresa;  University of Vienna
Aerts, Conny;  University of Leuven
De Cat, Peter;  University of Leuven
Language :
English
Title :
Surface Mapping of the he & SI Distribution of Four B Stars
Publication date :
2003
Event name :
25th meeting of the IAU
Event date :
17 July 2003
Audience :
International
Main work title :
Astrotomography, 25th meeting of the IAU, Joint Discussion 9, 17 July 2003, Sydney, Australia
Pages :
23
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since 19 October 2012

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