A5073136796- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Marine and environmental studies
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Molecular Physics
- Gamma-ray bursts and supernovae
Universidad Nacional Autónoma de México
2019-2021
We present a reassessment of the radial abundance gradients He, C, N, O, Ne, S, Cl, and Ar in Milky Way using deep optical spectra 42 HII regions presented Arellano-C\'ordova et al. (2020, 2021) M\'endez-Delgado (2020) exploring impact of: (1) new distance determinations based on Gaia EDR3 parallaxes (2) use Peimbert's temperature fluctuations paradigm ($t ^ 2> 0$) for deriving ionic abundances. find that distances data are more consistent with kinematic ones Galactic rotation curves...
We provide new ionization correction factors (ICFs) for carbon, nitrogen, neon, sulfur, chlorine, and argon in giant H II regions. The ICFs were computed using the most representative photoionization models from a large initial grid. selected an observational sample of 985 regions (GHR) spiral galaxies blue compact (BCG). was also used to assign weight each model describing how well it agrees with observations [O III]/Hbeta versus [N II]/Halpha diagram. In addition we provide, first time,...
ABSTRACT We use a large grid of photoionization models that are representative observed planetary nebulae (PNe) to derive ionization correction factors (ICFs) for sodium, potassium, and calcium. In addition the analytical expressions ICFs, we provide range validity where ICFs can be safely used an estimate typical uncertainties associated with ICFs. improved previous calcium potassium in literature suggest first time ICF sodium. tested our sample 39 PNe emission lines some ion these...
We analyse high-resolution ESPaDOnS/CFHT spectra of 20 very metal-poor stars ([Fe/H]~$<-2.0$) in the solar neighbourhood (within $\sim2$ kpc) selected to be on planar orbits (with a maximum height $\lesssim4$ kpc). Targets include 11 prograde and 9 retrograde stars, spanning wide range eccentricities ($0.20-0.95$). Their chemical abundances are consistent with those observed Galactic halo but show smaller spread, no notable difference between progrades retrogrades. This suggests common...