Conny Aerts, Elena Sabbi (Space Telescope Science Institute), Selma de Mink
9/20/17, 9:00 AM
Nate Bastian (Liverpool John Moores University)
9/20/17, 9:15 AM
Young massive clusters (YMCs) offer an exceptional opportunity to test our understanding of stellar evolution, due to the large numbers of stars in all phases of evolution. High precision CMDs of YMCs have shown unexpected features (e.g., extended main sequence turnoffs and dual main sequences), that originally were thought to suggest that large (100s of Myr) age spreads were present within...
Andrew Tkachenko (Institute of Astronomy, KU Leuven)
9/20/17, 10:15 AM
The mass discrepancy in binaries stands for the difference between the stellar component masses inferred from binary dynamics (dynamical masses), and those obtained from spectral characteristics of stars and evolutionary models (evolutionary masses). The discrepancy is a strong indication of our theories/models to contain shortcomings as the dynamical masses are strictly observational and...
Jason Kalirai (STScI)
9/20/17, 10:45 AM
Modern studies of individual stellar populations are increasingly uncovering stars that reside in a wide range of evolutionary states and mass ranges. Soon to execute programs with the James Webb Space Telescope will link brown dwarfs to white dwarfs in the same color-magnitude diagrams! Over the past 15 years, our group has led a global study of the initial-final mass relation of stars to...
Jieun Choi (Harvard University)
9/20/17, 11:00 AM
Accurate inference of stellar parameters and well-calibrated models are paramount to many fields in astronomy, including galactic archaeology and exoplanets. We use the framework developed as part of the MESA Isochrones and Stellar Tracks (MIST) project to compute a series of evolutionary models and assess the utility of various observational data sets for the task of constraining uncertain...
Andrea Dupree (Harvard-Smithsonian Center for Astrophysics)
9/20/17, 11:15 AM
Young globular clusters in the Large Magellanic Clouds could provide insight into the problem of multiple populations found in Milky Way clusters. Photometric studies of young clusters have discovered an extended (broadened) main sequence turnoff (eMSTO) and a bifurcated main sequence. Isochrone fitting and broad and narrow-band photometry have suggested several explanations to account for...
Cyril Georgy (University of Geneva)
9/20/17, 11:30 AM
In this talk, I will review how rotation affects stellar evolution. Particularly, I will discuss the effects of rotation on the internal structure of star and the uncertainties linked to its modelling. I will also discuss how rotation affects the stellar surface, and how this affects the stellar characteristics (Teff and L). Finally, I will put all of these effects together, and discuss the...
Fabian Schneider (University of Oxford)
9/20/17, 12:00 PM
Except for the Sun, ages of individual stars can only be estimated from models or calibrations and are never of fundamental nature. Depending on the stellar type, stellar environment and method of the age inference process, age estimates are subject to various biases and uncertainties. In massive (O) stars, ages are usually estimated by comparing observables of stars such as luminosity,...
Michele Cignoni (Università di Pisa/INFN)
9/20/17, 12:30 PM
I will present the detailed recent star formation history (SFH) of dwarf galaxies between 3 and 12 Mpc from the Legacy ExtraGalactic UV Survey (LEGUS). This sample includes a variety of morphologies and densities, such as the diffuse and low density Holmberg II, the Magellanic irregular NGC4449 and the Blue Compact NGC1705. The SFHs are derived by comparing deep UV color-magnitude diagrams...