First summer school on disentangling of spectra

Ondřejov, Czech Republic 15.9.2008 - 19.9.2008

Contributions:

oral contributions:

• H. Ak - KOREL application on HD 10308 spectral binary
• N. F. Ak - KOREL application on IX Per spectral binary
• O. Creevey - Spectroscopic observations of a red-edge delta Scuti star in an eclipsing binary
  Abstract: A correct interpretation of asteroseismic data relies on combining them with complementary observations in order to form a consistent picture of the star under study. Today I will present some spectroscopic observations of a detached eclipsing binary with a pulsating delta Scuti component. Initial analysis places this object on the red-edge of the instability strip, and the tight constraints on the parameters already restrict the mode-identification of the oscillation frequency. Future work involves disentangling the spectra to perform an atmospheric abundance analysis: this will relieve the tight correlation between age and metallicity as well as a further restriction on the mode-identification.
• H. Lehmann - TW Dra: Spectral disentangling of an unusual triple system
  Anstract: TW Dra is an Algol-type system where the primary shows Delta Sct-like oscillations. Based on a time series of high-resolution spectra taken at the 2-m telescope at Tautenburg observatory we want to derive the system and basic stellar parameters and to study mass-tranfer and oscillations and their possible connection. Since TW Dra is also a member of a close visual binary, sporadically varying contributions of the third component occur in the composite spectra, depending on the seeing conditions and slit orientation during the observations. The talk focuses on the spectral disentangling using KOREL which was used in a first step to clean the observations from the effects of orbital motion and to derive stellar parameters from the disentangled spectra. It describes in particular the problems in disentangling and normalization of the spectra due to the very special observational conditions.
• V. Senavci - The Echelle Spectra of SW Lac
  Abstract

• J. Elner - Applications of Fourier disentangling on the spectra of multiple stars
  Abstract: Fourier disentangling is one of progressive methods developed for decomposition of composite spectra of multiple stellar systems. We apply code KOREL (Hadrava, 2004) to study several stellar systems, to obtain individual spectra of their components, to precise their orbital parameters and even unreveal so far undetected components as well as suggest their physical nature. Secular changes of the orbital parameters can be studied as well. These calculations can be treated as a test of applicability, functionality and limitations of the presented method and some conclusions can be discussed.
• P. Lampens - Spectra disentangling and combined orbital solution for the Hyades binary Theta 2 Tau