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Atmospheric Structure of the Pulsating Ap [CP2] Star HR 3831 from Rapid Multicolour Photometry

Published online by Cambridge University Press:  12 April 2016

Jaymie M. Matthews ,
William H. Wehlau ,
John Rice  and
Gordon A. H. Walker
Jaymie M. Matthews
Affiliation:
Département de physique, Université de Montréal, C.P. 6128, succ. A, Montréal, Québec H3C 3J7Canada
William H. Wehlau
Affiliation:
Department of Astronomy, University of Western Ontario, London, Ontario N6A 3K7Canada
John Rice
Affiliation:
Department of Physics, Brandon University, Brandon, Manitoba R7A 6A9Canada
Gordon A. H. Walker
Affiliation:
Department of Geophysics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1W5Canada

Extract

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Rapidly oscillating Ap (roAp) stars are cool magnetic CP2 stars which vary with periods of a few minutes and amplitudes less than 0.01 mag and 1 km/s in light and velocity. Analysis of their p-mode eigenfrequency patterns and splittings gives information about evolutionary state, rotation rate, magnetic field geometry and internal field strength (see Kurtz 1990; Matthews 1991). We present here an example of how roAp pulsations can be used to obtain an estimate of the temperature structure of an Ap atmosphere.

The pulsation amplitudes of roAp stars decline more rapidly with increasing wavelength than other known pulsators. Matthews et al. (1990) explained this by the wavelength dependence of limb darkening and its weighting effect on the integrated amplitude of an (l, m) = (1,0) mode.

Type
II. Atmospheres, a window to the interior
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 199 - 201
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Kurtz, D.W. 1990, Ann. Rev. Astron. Astrophys 28, 607.CrossRefGoogle Scholar
Kurtz, D.W., Shibahashi, H. and Goode, P.R. 1990, M.N.R.A.S. 247, 558.Google Scholar
Matthews, J.M. 1991, P.A.S.P. 103, 5.CrossRefGoogle Scholar
Matthews, J.M., Wehlau, W.H. and Walker, G.A.H. 1990, Ap. J. 365, L81.Google Scholar
Shibahashi, H. and Saio, H. 1985, P.A.S. Japan 37, 245.Google Scholar