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Bisector analysis of RR Lyrae: atmosphere dynamics at different phases

Published online by Cambridge University Press:  18 February 2014

Elisabeth Guggenberger ,
Denis Shulyak ,
Vadim Tsymbal  and
Katrien Kolenberg
Elisabeth Guggenberger
Affiliation:
Institut für Astrophysik, Universität Wien, Türkenschanzstrasse 17, 1180 Vienna, Austria email: elisabeth.guggenberger@univie.ac.at
Denis Shulyak
Affiliation:
Institute of Astrophysics, Georg-August University, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
Vadim Tsymbal
Affiliation:
Tavrian National University, Vernadskiys Avenue 4, Simferopol, Crimea, 95007, Ukraine
Katrien Kolenberg
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA Instituut voor Sterrenkunde, University of Leuven, Celestijnenlaan 200D, B 3001 Heverlee, Belgium
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Abstract

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This article reports some preliminary results on an analysis of line bisectors of metal absorption lines of RR Lyrae, the prototype of its class of pulsators. The extensive data set used for this study consists of a time series of spectra obtained at various pulsation phases as well as different Blazhko phases. This setup should allow a comparison of the atmospheric behaviour, especially of the function of radial velocity versus depth at differing Blazhko phases, but (almost) identical pulsation phase, making it possible to investigate whether the modulation causes a change in the atmospheric motion of RR Lyrae. While the nature of the Blazhko modulation has often been investigated photometrically and described as a change in the light curve, studies on time series of high resolution spectra are rare. We present for the first time work on line bisectors at different phases of RR Lyr.

Keywords

line: profilestechniques: spectroscopicstars: atmospheresstars: variables: RR Lyrae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 261 - 264
Copyright
Copyright © International Astronomical Union 2014 

References

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