47 citations · 268 across the 20 of their papers we have counts for
11 papers · 1 filter
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,…
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…
The kinematical behavior of ORLs and CELs in PNe with [WC] central star
Miriam Pena, Francisco Ruiz-Escobedo, Jackeline Rechy-Garcıa +1
In Planetary Nebulae (PNe) and HII regions ionic abundances can be derived by using collisionally excited lines (CELs) or recombination lines (ORLs). Such abundances do not coincid…
The PNe and H II regions in NGC 6822 revisited. Clues to AGB nucleosynthesis
Jorge García-Rojas, Miriam Peña, Sheila Flores-Durán +1
(Abridged) The chemical behaviour of an ample sample of PNe in NGC6822 is analyzed. Spectrophotometric data of 11 PNe and two H II regions were obtained with the OSIRIS spectrograp…