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Physical conditions and chemical abundances in PN M 2-36. Results from deep echelle observations
José N. Espíritu, Antonio Peimbert
We present a spectrum of the planetary nebula M 2-36 obtained using the Ultra Violet and Visual Echelle Spectrograph (UVES) at the Very Large Telescope (VLT). 446 emission lines ar…
Kinematic footprint of the Milky Way spiral arms in Gaia EDR3
Luis Martinez-Medina, Angeles Pérez-Villegas, Antonio Peimbert
The Milky Way spiral arms are well established from star counts as well as from the locus of molecular clouds and other young objects, however, they have only recently started to b…
Chemical abundances in 7 metal-poor HII regions and a determination of the primordial helium abundance
Mabel Valerdi, Antonio Peimbert, Manuel Peimbert
We conducted a long-slit spectrophotometry analysis to obtain the chemical abundances of seven metal-poor HII regions in three galaxies: UM 160, UM 420, and TOL 0513-393. The data…