Speaker
Prof.
Jiri Krticka
(Masaryk University)
Description
Opacity variation across the stellar surface is the key aspect of the spectral
energy distribution (SED) variability in chemically peculiar stars. The opacity
variations are caused by the presence of surface spots with enhanced (or
depleted) abundance of individual elements. Simulations of the SED variability
of chemically peculiar stars with abundances derived from Doppler mapping
provide a detailed test of the continuum (bound-free) and line opacities in the
model atmospheres. The effect of opacities on the SED is most pronounced in the
ultraviolet region. We simulate the ultraviolet and visual SED variability of
selected chemically peculiar stars using model atmospheres calculated for
actual surface abundances and compare the predicted SED with observational
results. We show that the simulations can reliably predict the observed SED and
its variability provided that complete bound-free and bound-bound opacities are
used. Therefore, the variability of chemically peculiar stars may serve as a
test of opacities included in model atmospheres.
Primary author
Prof.
Jiri Krticka
(Masaryk University)
Co-authors
Dr
Juraj Zverko
(Tatranska Lomnica)
Mr
Milan Prvak
(Masaryk University)
Dr
Theresa Lueftinger
(University of Vienna)
Prof.
Zdenek Mikulasek
(Masaryk University)
