• Stellar Evolution, accented by Modules for Experiments for Stellar Astrophysics (MESA) • Supernovae, with emphasis on their progenitor evolution, explosion, and nucleosynthesis • Cosmic chemical evolution, the evolution of every isotope at every point in spacetime • Astrobiology, the synthesis and delivery of bioessential elements to habitable systems • Gamma-ray astronomy, particularly from ...

Planetary nebulae (PN) represent the evolutionary fate of the asymptotic giant branch (AGB) stellar envelopes, thus are ideally suited to study the chemical impact of AGB stars. Stellar evolution predict elemental enrichment through the AGB evolution, and convective dredge-up episodes allow the products of stellar evolution to reach the stellar outer layers. Planetary nebulae are probes of thes...

• Stellar Evolution, accented with Modules for Experiments for Stellar Astrophysics (MESA) • Supernovae, with emphasis on their progenitor evolution, explosion, and nucleosynthesis • Cosmic chemical evolution, the evolution of every isotope at every point in spacetime • Astrobiology, the synthesis and delivery of bioessential elements to habitable systems • Gamma-ray astronomy, particularly fro...

Planetary nebulae (PN) represent the evolutionary fate of the asymptotic giant branch (AGB) stellar envelopes, thus are ideally suited to study the chemical impact of AGB stars. Stellar evolution predict elemental enrichment through the AGB evolution, and convective dredge-up episodes allow the products of stellar evolution to reach the stellar outer layers. Planetary nebulae are probes of thes...

It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...

We present the results of a study to determine the co-evolution of the virial and stellar masses for a sample of 83 disk galaxies between redshifts z = 0.2 − 1.2. The virial masses of these disks are computed using measured maximum rotational velocities from Keck spectroscopy and scale lengths from Hubble Space Telescope imaging. We compute stellar masses based on stellar population synthesis m...