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On the Ultraviolet Photometric Variability of the Helium-Weak B Stars (From ANS Data)

Published online by Cambridge University Press:  12 April 2016

E.I. Želwanowa  and
W. Sohöneich
E.I. Želwanowa
Affiliation:
Zentralinstitut für Astrophysik der AdW der DDR15 Potsdam, Rosa-Luxemburg-Str. 17A, GDR
W. Sohöneich
Affiliation:
Zentralinstitut für Astrophysik der AdW der DDR15 Potsdam, Rosa-Luxemburg-Str. 17A, GDR

Abstract

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Photometric observations in the ultraviolet region obtained by the ANS satellite enabled us: to confirm with a slight improvement the rotational period of HD 22470 (UV lightcurves of HD 22470 compared with u and magnetic curves are shown in fig. 1); to confirm the variability with very small amplitudes for HD 74196, a member of the open cluster IC 2391 (Fig. 2)

to compare the amplitude-wavelength relations of some other He-weak stars with known periods (HD 35298, HD 142884, HD 144334, HD 175362, and HD 109026). A preliminary rotational period for the star HD 109026 using the 11 ANS observations was found to be about 1.5 days.

Type
Section III - Magnetic CP Stars
Information
International Astronomical Union Colloquium , Volume 90: Upper Main Sequence Stars with Anomalous Abundances , 1986 , pp. 271 - 274
Copyright
Copyright © Reidel 1986

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