96 citations · 888 across the 50 of their papers we have counts for
49 papers
The s-process at Subsolar Metallicity: Insights from High-Resolution Infrared Spectroscopy of Magellanic Cloud Planetary Nebulae
N. C. Sterling, M. G. Stephenson, Harriet L. Dinerstein +8
We present observations of 12 Magellanic Cloud planetary nebulae (PNe) obtained with the high-resolution near-infrared spectrometer IGRINS on Gemini South. In 10 targets we detect…
Investigating the electron temperature of [Ar IV] in planetary nebulae using the DESIRED database
J. García-Rojas, E. Reyes-Rodríguez, J. E. Méndez-Delgado +9
(Abridged) We investigate the behaviour of the electron temperature derived from [Ar IV] lines, Te([Ar IV]), in a sample of PNe to characterize the thermal structure of high-excita…
The DESIRED temperature-metallicity relations in star-forming regions: probing the Galactic radial and azimuthal metallicity distributions
I. Rafael Martínez-Hernández, J. Eduardo Méndez-Delgado, César Esteban +17
We analyse a sample of 225 star-forming regions from the DESIRED-E project, each with simultaneous determinations of the electron temperature from ionized nitrogen and oxygen, $T_{…
WEAVE imaging spectroscopy of NGC 6720: an iron bar in the Ring
R. Wesson, J. E. Drew, M. J. Barlow +23
We present spatially resolved spectroscopic observations of the planetary nebula NGC 6720, the Ring Nebula, taken during the science verification phase of WEAVE, a new instrument m…
Why the Northern Hemisphere Needs a 30-40 m Telescope and the Science at Stake: Northern Local Star-forming Dwarf Galaxies. Analogues of the First Galaxies and Probes of the Cosmic Metallicity Scale
C. Esteban, J. M. Vilchez, J. García-Rojas +15
Star-forming dwarf galaxies in the local Universe, especially extremely metal-poor ones, can be considered analogous to early galaxies of the Epoch of Reionization (z >= 6). Curren…
Chlorine abundances in star-forming regions of the local Universe
M. Orte-García, C. Esteban, J. E. Méndez-Delgado +4
Aims. We study the behaviour of Cl abundance and its ratios with respect to O, S and Ar abundances in a sample of more than 200 spectra of Galactic and extragalactic H ii regions a…
Alpha-element abundance patterns in star-forming regions of the local Universe
C. Esteban, J. E. Méndez-Delgado, J. García-Rojas +6
(Abridged) We reassess the alpha-element abundance ratios (Ne/O, S/O, Ar/O) with respect to metallicity in ~1000 spectra of Galactic and extragalactic HII regions and star-forming…
On the chlorine abundance in H II regions
Maialen Orte-García, César Esteban, José Eduardo Méndez-Delgado +1
Chlorine (Cl) is a chemical element of the group of the halogens and is between the 17th and the 20th most abundant elements in the Solar System. It is thought to be produced from…
Generalized ([OIII])-(HeI) Discrepancies in Ionized Nebulae: Possible Evidence of Case B Deviations and Temperature Inhomogeneities
J. E. Méndez-Delgado, E. D. Skillman, E. Aver +11
The physics of recombination lines (RLs) in the HeI singlet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of HeI singl…
Gas-phase Fe/O and Fe/N abundances in Star-Forming Regions. Relations between nucleosynthesis, metallicity and dust
J. E. Méndez-Delgado, K. Kreckel, C. Esteban +10
In stars, metallicity is usually traced using Fe, while in nebulae, O serves as the preferred proxy. Both elements have different nucleosynthetic origins and are not directly compa…
MUSE spectroscopy of the high abundance discrepancy planetary nebula NGC 6153
V. Gómez-Llanos, J. García-Rojas, C. Morisset +5
(Abridged) The abundance discrepancy problem in planetary nebulae (PNe) has long puzzled astronomers. NGC6153, with its high Abundance Discrepancy Factor (ADF~10), provides an oppo…
Excitation mechanisms of C II optical permitted lines in ionized nebulae
E. Reyes-Rodríguez, J. E. Méndez-Delgado, J. García-Rojas +4
Context. Carbon is the fourth most abundant element in the universe and its distribution is critical to understanding stellar evolution and nucleosynthesis. In optical studies of i…
The abundance discrepancy in ionized nebulae: which are the correct abundances?
José Eduardo Méndez-Delgado, Jorge García-Rojas
Ionized nebulae are key to understanding the chemical composition and evolution of the Universe. Among these nebulae, H~{\sc ii} regions and planetary nebulae are particularly impo…
Temperature inhomogeneities in Mrk71 can not be discarded
J. Eduardo Méndez-Delgado, César Esteban, Jorge García-Rojas +2
In a very recent work, [1] claim that the scenario of temperature inhomogeneities proposed by [2] ( > 0) is not able to explain the O/H abundance discrepancy obser…
On the computation of interstellar extinction in photoionized nebulae
Christophe Morisset, Romano L. M. Corradi, Jorge García-Rojas +5
Ueta & Otsuka (2021) proposed a method, named as the "Proper Plasma Analysis Practice", to analyze spectroscopic data of ionized nebulae. The method is based on a coherent and simu…
The planetary nebula NGC 6153 through the eyes of MUSE
V. Gómez-Llanos, J. García-Rojas, C. Morisset +7
In this contribution, we present the results of a study on the high abundance discrepancy factor (ADF 10) planetary nebula (PN) NGC 6153 with MUSE. We have constructed flux…
The homogeneity of chemical abundances in H II regions of the Magellanic Clouds
G. Domínguez-Guzmán, M. Rodríguez, J. García-Rojas +3
We use very deep spectra obtained with the Ultraviolet-Visual Echelle Spectrograph at the Very Large Telescope to derive physical conditions and chemical abundances of four H II re…
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy III: HH514
J. E. Méndez-Delgado, C. Esteban, J. García-Rojas +2
We analyze the physical conditions and chemical composition of the photoionized Herbig-Haro object HH~514, which emerges from the proplyd 170-337 in the core of the Orion Nebula. W…
Gradients of chemical abundances in the Milky Way from HII regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
J. E. Méndez-Delgado, A. Amayo, K. Z. Arellano-Córdova +4
We present a reassessment of the radial abundance gradients of He, C, N, O, Ne, S, Cl, and Ar in the Milky Way using the deep optical spectra of 42 HII regions presented in Arellan…
The post-common-envelope binary central star of the planetary nebula Ou 5: a doubly-eclipsing post-red-giant-branch system
David Jones, James Munday, Romano Corradi +10
We present a detailed study of the stellar and orbital parameters of the post-common envelope binary central star of the planetary nebula Ou~5. Low-resolution spectra obtained duri…
MUSE spectroscopy of planetary nebulae with high abundance discrepancies
Jorge García-Rojas, Christophe Morisset, David Jones +5
We present MUSE deep integral-field unit spectroscopy of three planetary nebulae(PNe) with high abundance discrepancy factors (ADF > 20): NGC 6778, M 1-42 and Hf 2-2. We have const…
On the most luminous planetary nebulae of M31
Rebeca Galera-Rosillo, Antonio Mampaso, Romano L. M. Corradi +6
To study the progenitors of PNe at the tip of the Planetary Nebula Luminosity Function (PNLF), we obtained the deepest existing spectra of a sample of PNe in the galaxy M31. Precis…
On the radial abundance gradients of nitrogen and oxygen in the inner Galactic disc
Karla. Z. Arellano-Córdova, César Esteban, Jorge García-Rojas +1
We present optical spectra of nine Galactic H II regions observed with the 10.4 m Gran Telescopio Canarias telescope and located at Galactocentric distances (RG) from 4 to 8 kpc. T…
A study of extragalactic planetary nebulae populations based on spectroscopy. I. Data compilation and first findings
Gloria Delgado-Inglada, Jorge García-Rojas, Grazyna Stasińska +1
We compile published spectroscopic data and [O III] magnitudes of almost 500 extragalactic planetary nebulae (PNe) in 13 galaxies of various masses and morphological types. This is…