Title: Bisector analysis of RR Lyrae: atmosphere dynamics at different phases
Authors: Guggenberger, E.
Shulyak, D.
Tsymbal, V.
Kolenberg, Katrien
Issue Date: Feb-2014
Publisher: International Astronomical Union 2014
Host Document: Precision Asteroseismology, Proceedings of the International Astronomical Union vol:301 pages:261-264
Conference: IAU Symposium edition:301 location:Wroclaw, Poland date:19-23 August 2013
Abstract: 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.
Publication status: published
KU Leuven publication type: IC-p
Appears in Collections:Institute of Astronomy

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