We have obtained the mass-metallicity (M–Z) relation at different lookback times for the same set of galaxies from the Sloan Digital Sky Survey, using the stellar metallicities estimated with our spectral synthesis code starlight. We have found that this relation steepens and spans a wider range in both mass and metallicity at higher redshifts. We have modeled the time evolution of stellar meta...

The role of hydrodynamic mixing in astrophysics is reviewed, emphasizing connections with laser physics experiments and inertial confinement fusion (ICF). Computer technology now allows two dimensional (2D) simulations, with complex microphysics, of stellar hydrodynamics and evolutionary sequences, and holds the promise for 3D. Careful validation of astrophysical methods, by laboratory experime...

We investigate how the formation and evolution of extrasolar planetary systems can be affected by stellar encounters that occur in the crowded conditions of a stellar cluster. Using plausible estimates of cluster evolution, we show how planet formation may be supressed in globular clusters while planets wider than > ∼ 0.1 au that do form in such environments can be ejected from their stellar sy...

A brief review of various methods to calculate radiative accelerations for stellar evolution and an analysis of their limitations are followed by applications to Pop I and Pop II stars. Recent applications to Horizontal Branch (HB) star evolution are also described. It is shown that models including atomic diffusion satisfy Schwarzschild’s criterion on the interior side of the core boundary on ...

ABSTRACT One-zone Galactic chemical evolution (GCE) models have provided useful insights on a great wealth of average abundance patterns in many environments, especially for the Milky Way and its satellites. However, scatter such is still challenging aspect to reproduce. The leading hypothesis that dynamics likely major source dispersion. In this work, we test another hypothesis, namely, differ...

Thermal pulsation is a complicated mixing event in AGB stars which involves interaction between several layers of the stellar interior, and which occurs on very short timescales compared to a star’s evolutionary timescale. The temporal constraint makes these events difficult to resolve in a 1-D stellar evolution codes, and instead they are typically studied in isolation through 3-D smoothed-par...