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Some recent discoveries in roAp stars

Published online by Cambridge University Press:  02 March 2005

D.W. Kurtz ,
V.G. Elkin ,
G. Mathys ,
J. Riley ,
M.S. Cunha ,
H. Shibahashi  and
E. Kambe
D.W. Kurtz
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK e-mail: [email protected]
V.G. Elkin
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK e-mail: [email protected]
G. Mathys
Affiliation:
European Southern Observatory, Casilla 19001, Santiago 19, Chile
J. Riley
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK e-mail: [email protected]
M.S. Cunha
Affiliation:
Centro de Astrofsica da Universidade do Porto, Rua das estrelas, 4150 Porto, Portugal
H. Shibahashi
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo 113-0033, Japan
E. Kambe
Affiliation:
Department of Earth and Ocean Sciences, National Defence Academy, Yokosuka, Kanagawa 239-8686, Japan
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Abstract

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Research in roAp stars is being vigorously pursued, both theoretically and observationally by many groups. We report the discovery of a 21-min period, luminous roAp star, HD 116114. Longer periods for more luminous stars have been predicted theoretically and this is the first discovery of such a star. We discuss a model for the blue-to-red line profile variability observed in some roAp stars involving a shock wave high in the atmosphere of roAp stars, yet show that the H$\alpha$ line in 33 Lib has the blue-to-red-to-blue line profile variability expected for subsonic dipolar pulsation concentrated towards the pulsation pole. Further we report for 33 Lib unprecedented observations of the amplitudes and phases of its principal mode at 2.015 mHz and its first harmonic of that at 4.030 mHz.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Stars: chemically peculiarstars: oscillationsstars: variables: otherstars: individual: (HD 116114, HD 137949)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS224 , July 2004 , pp. 343 - 352
Copyright
© 2004 International Astronomical Union