Author:
Matthias Ammler-von Eiff, TLS Tautenburg, Germany

Title:
TY CrA revisited -- Optical and Near-IR observations and multi-dataset
analysis

Abstract:
TY CrA is one of the few key objects to understand the evolution of
young stars before they reach the main-sequence. As it is an eclipsing
binary, mass and radius of both components can be determined at high
precision and be compared to models of stellar evolution. The eclipsing
binary was analyzed in the optical wavelength range $\sim$15 years ago
in great detail. However, the crucial secondary eclipse minimum is very
shallow and the light curve shows further peculiarities complicating the
light curve analysis. The present work aims at using lightcurves
obtained in both near-IR and optical light so that the light curve can
be analysed at higher precision.

I will present the case of TY CrA and show how it sheds light on early
stellar evolution. Open issues in the analysis of the light curve and
the radial velocities will be discussed. Finally, I will demonstrate the
value of near-IR observations for the analysis of TY CrA.