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Do Bp Stars Have “Flares”?(*

Published online by Cambridge University Press:  12 April 2016

Balázs Vető
Balázs Vető*
Affiliation:
Gothard Astrophysical Observatory of Eötvös University Szent Imre Herceg út 112, H-9707 Szombathely, Hungary

Abstract

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UBV(RI)c photoelectric observations of four variable magnetic Bp stars (HD 21699, HD 177003, HD 184927 and HD 217833) were carried out between 1989 and 1992. Random fluctuation of 0m.1 range was detected in the U colour band in the case of HD 177003 and HD 184927. The U light curve of HD 21699 shows 0m.02 peaks superposed on the periodic light variation which definitely exceeds the typical error of the observations. It is not likely that atmospheric extinction or observational error would cause the phenomena described. On the other hand there are no physical processes known which lead to such changes of the U band continuum radiation in Bp stars.

Type
III. Magnetic Versus Non-Magnetic Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 340 - 344
Copyright
Copyright © Astronomical Society of the Pacific 1993

Footnotes

(*

Based on observations collected at the Konkoly Observatory

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