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Radial velocity pulsations in the atmosphere of the roAp star HD 24712

Published online by Cambridge University Press:  02 March 2005

M. Sachkov ,
T. Ryabchikova ,
I. Ilyin ,
O. Kochukhov  and
T. Lüftinger
M. Sachkov
Affiliation:
Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia email: msachkov@inasan.ru
T. Ryabchikova
Affiliation:
Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia email: msachkov@inasan.ru Institute for Astronomy, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria
I. Ilyin
Affiliation:
Astrothysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
O. Kochukhov
Affiliation:
Institute for Astronomy, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria
T. Lüftinger
Affiliation:
Institute for Astronomy, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria
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Abstract

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We present results of the analysis of spectroscopic time-series observations of the roAp star HD 24712 obtained at the phase of magnetic maximum. As in previous investigations of roAp stars we found that only lines of the rare-earth elements (REE) show RV pulsational variations. These pulsations in HD 24712 are characterised by gradual phase shifts between RV curves of different REE. The same pulsations of HD 24712 were observed in 2001, giving strong evidence for the stability of the pulsational mechanism in this star. NLTE calculations of Nd line depth formation in stratified atmosphere of HD 24712 allowed us to study the pulsational phase distribution with optical depth, providing strong evidence for a running wave, propagating outward with nearly constant RV amplitude.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Stars: chemically peculiarstars: atmospheresstars: individual: (HD 24712)techniques: radial velocitiestechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS224 , July 2004 , pp. 770 - 774
Copyright
© 2004 International Astronomical Union