Kiss, László (MTA Konkoly
Observatory)
Time-series analysis in variable
star astronomy: recent advances in the physics of stellar oscillations
Observations of brightness
variations of stars can reveal unique astrophysical information that is beyond reach
otherwise. Most notably asteroseismology, the study of internal structure of
stars via interpreting their oscillation spectra, has seen a tremendous
development in the last 10-15 years. The roots of this lie in the advances of
space photometry, a special technique for obtaining 10^{-6}
relative precision in the brightness measurements and in the new tools in
modelling and interpreting the time-series observations. In addition to the
classical linear analyses, such as the variations of the Fourier-technique, a
range of time-frequency methods has been applied to real empirical data to
detect hidden regular structures in the signals that can have physical
implications. On the other hand, the use of non-linear methods, such as phase
space reconstruction and the detection of low-dimensional chaos in
astrophysical systems, has also seen an increased popularity due to the new
kind of data made possible by the dedicated space photometric missions. Here we
present some of the most fundamental tools that are used in stellar
astrophysics and highlight the most spectacular results that were obtained by
these seemingly "boring" computational methods.
The talk is held in English!
Az előadás nyelve angol!
Date: Oct 9, Tuesday 4:15pm
Place: BME, Building „Q”, Room QBF13