Seminarium IA, środa 11 maja, godzina 11:15, sala 34 (A-2)
Prelegent: Dr Dariusz Graczyk (Universidad de Concepción, Chile)
Tytuł: Calibration of fundamental radiative flux scale with nearby eclipsing binaries.
About 10 years ago we started a project devoted to determination of precise physical parameters of a number of nearby eclipsing binaries having trigonometric parallaxes measured by Hipparcos. Main objective of the project is calibration of the surface brightness - colour (SBC) and temperature - colour relations for wide range of stellar spectral types with superb precision of 1%. Such SBC relations may be used to predict an angular diameters of stars and distances to eclipsing binary stars. Much of an improvement is expected with Gaia mission data release of parallaxes for many nearby eclipsing binaries. Ultimate goal is utilising the resulting SBC relations to derive very precise distances based on eclipsing binary stars and pulsating stars (Baade-Wesselink) to Local Group galaxies beyond Magellanic Clouds like M31 and M33. However, the main obstacle for the project is a lack of well calibrated multi-epoch infrared photometry and we started photometric campaign to resolve this problem. I would like to add also some comments about serendipitous discoveries we did during this project.