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Spectral Variations of the Rapidly Oscillating Ap Star HD 60435

Published online by Cambridge University Press:  12 April 2016

J.M. Matthews ,
R.W. Slawson  and
W.H. Wehlau
J.M. Matthews
Affiliation:
Dept. of Astronomy, U. of Western Ontario
R.W. Slawson
Affiliation:
Las Campanas Observatory, U. of Toronto
W.H. Wehlau
Affiliation:
Dept. of Astronomy, U. of Western Ontario

Abstract

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The peculiar F star HD 60435 exhibits broadband light oscillations of low amplitude with periods between 15 and 4 minutes. Photographic spectra obtained in January/February 1985 using the University of Toronto 0.6 m telescope on Las Campanas, Chile, reveal that the star also undergoes slow spectral variations like those observed in many Ap stars. The data further suggest that Sr II maximum may coincide with maximum amplitude of light oscillations. According to the oblique pulsator model (Kurtz 1982) for such variables, this implies that Sr II is concentrated near at least one of the magnetic poles of HD 60435.

Type
VI Intermediate Helium Stars
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 313 - 319
Copyright
Copyright © Reidel 1986

References

Kurtz, D.W. 1982. M.N.R.A.S. 200, 807.CrossRefGoogle Scholar
Kurtz, D.W. 1984. M.N.R.A.S. 209, 841.Google Scholar
Matthews, J.M., Kurtz, D.W., and Wehlau, W.H. 1986. Ap. J. 300, 349.Google Scholar
Matthews, J.M., Kurtz, D.W., and Wehlau, W.H.. 1986a. in preparation.Google Scholar