47 citations · 268 across the 20 of their papers we have counts for
20 papers
Evolution of Hen\,3-1357, the Stingray Nebula
Miriam Peña, Mudumba Parthasarathy, Francisco Ruiz-Escobedo +1
The spectroscopic evolution of Hen\,3-1357, the Stingray Nebula, is presented by analysing data from 1990 to 2021. High resolution data obtained in 2021 with South African Large Te…
Abundance Discrepancy Factors in high density planetary nebulae
Francisco Ruiz-Escobedo, Miriam Peña
From high-resolution spectra, chemical abundances from collisionally excited lines (CELs) and optical recombination lines (ORLs) have been determined for planetary nebulae Cn 3-1,…
Twenty years of observations of PM 1-188: Its chemical abundances and extraordinary kinematics
Miriam Peña, Liliana Hernández-Martínez, Francisco Ruiz-Escobedo
The analysis of 20 years of spectrophotometric data of the double shell planetary nebula PM\,1-188 is presented, aiming to determine the time evolution of the emission lines and th…
Metallicity gradients in M31, M33, NGC 300 and the Milky Way using abundances of different elements
Miriam Peña, Sheila N. Flores-Durán
Metallicity gradients derived from planetary nebulae (PNe) using O, Ne, and Ar abundances are studied and compared to those from HII regions in the galaxies M31, M33, NGC 300 and t…
Chemistry in the dIrr galaxy Leo A
Francisco Ruiz-Escobedo, Miriam Peña, Liliana Hernández-Martínez +1
We present chemical abundance determinations of two H II regions in the dIrr galaxy Leo A, from GTC OSIRIS long-slit spectra. Both H II regions are of low excitation and seem to be…
The kinematical behaviour of ORLs and CELs in Galactic PNe
Miriam Peña, Francisco Ruiz-Escobedo, Jackeline S. Rechy-Garcia +1
The kinematics of the plasma in 14 PNe is analysed by measuring the expansion velocities (V) of different ions as derived from their collisionally excited lines (CELs) and…