This is a talk held during the regular colloquium series (usually Tuesdays at 4pm).
Classical Cepheids are one of the most important standard candles that anchor the distance ladder for cosmology. These stars are also powerful probes of massive star evolution thanks to their pulsation properties.
Recent years have seen emerging theoretical efforts to understand how dwarf galaxies evolve with their circumgalactic medium (CGM), where stellar feedback is expected to be more efficient because of the galaxies’ weak gravitational potential.
The last decades of exoplanet exploration have revealed that the diversity of planets within the Galaxy far exceeds that within our solar system.
The chemistry of gas and stars in galaxies connects many areas of astrophysics, from star and planet formation on small scales, to the enrichment and physical state of the intergalactic and circumgalactic media on large scales.