Petr Hadrava
email:
web: http://www.asu.cas.cz/~had/had.html
phone: +420 267 103 348
Petr Hadrava works in the theory od stellar atmospheres, classical and relativistic radiative transfer and radiation hydrodynamics. He is the author of codes for solution of radial-velocity and light-curves (FOTEL) and for disentangling of spectra of multiple stars (KOREL). He is also interested in the history of medieval and renaissance astronomy.
The method of spectra disentangling, performed by the code KOREL, is a way of simultaneous decomposition of spectral components, solution of orbital elements, and 'line-photometry' of binary and multiple stars. It enables to overcome the problem of blending spectral lines by Doppler effect due to radial motion of the binary system. Comparing spectra obtained at different orbital phases, this method fits them as a superposition of some a priori unknown spectra attributed to individual components, each one Doppler shifted for its radial velocity (which is a free parameter or is obtained independently).