43 citations · 230 across the 20 of their papers we have counts for
20 papers
Dissecting NGC 3132: Tracing the mass-loss history of the southern ring planetary nebula
K. Bouvis, S. Akras, H. Monteiro +7
Central to our understanding of stellar evolution and its impact on processes in our Galaxy and across the Universe is the study of mass loss. While the general framework is well e…
The planetary nebula NGC 3132 revisited: high definition 3D photoionization model
H. Monteiro, C. Mendes de Oliveira, P. Amram +6
We present a detailed 3D photoionization model of the planetary nebula NGC 3132, constrained by the latest observations. Using the MOCASSIN code, the model incorporates integrated…
ALMA detection of Masers and Dasars in the Hydrogen Recombination Lines of the Planetary Nebula Mz3
Z. Abraham, P. P. B. Beaklini, I. Aleman +5
The hydrogen recombination lines H30, H40, H42, H50 and H57 and the underlying bremsstrahlung continuum emission were detected with ALMA in the bipolar nebula Mz3. T…
H molecular gas in the old planetary nebula NGC 3587
G. Ramos-Larios, M. A. Guerrero, J. A. Toalá +2
The acquisition of high-quality deep images of planetary nebulae (PNe) has allowed the detection of a wealth of small-scale features, which highlight the complexity of the formatio…
Detection of optical emission from the supernova remnant G7.7-3.7
V. Domček, J. V. Hernández Santisteban, A. Chiotellis +6
We present the first optical study of the supernova remnant (SNR) G7.7-3.7, with the aim of determining its evolutionary phase since it has been suggested to be the remnant of SN 3…
Analysis of Integral Field Spectroscopy observations of the planetary nebula Hen 2-108 and its central star
Bárbara L. Miranda Marques, Hektor Monteiro, Isabel Aleman +3
The study of planetary nebulae provides important constraints for many aspects of stellar and Galactic evolution. Hen 2-108 is a poorly known planetary nebula with a slight ellipti…
Planetary nebulae hosting accreting white dwarfs: A possible solution for the mysterious cut-off of Planetary Nebula Luminosity Function?
D. Souropanis, A. Chiotellis, P. Boumis +2
Many binary companions to the central stars of planetary nebulae (PNe) are found to be inflated, perhaps indicating that accretion onto the central star might occur during the PN p…
Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues
Stavros Akras
Theoretical predictions of the population of Galactic symbiotic stars (SySts) are highly inconsistent with the current known population. Despite intense effort over the past decade…
The messy death of a multiple star system and the resulting planetary nebula as observed by JWST
Orsola De Marco, Muhammad Akashi, Stavros Akras +66
Planetary nebulae (PNe), the ejected envelopes of red giant stars, provide us with a history of the last, mass-losing phases of 90 percent of stars initially more massive than the…
The miniJPAS survey: stellar atmospheric parameters from 56 optical filters
H. -B. Yuan, L. Yang, P. Cruz +29
With a unique set of 54 overlapping narrow-band and two broader filters covering the entire optical range, the incoming Javalambre-Physics of the Accelerating Universe Astrophysica…
Low-ionization structures in planetary nebulae -- II. Densities, temperatures, abundances and excitation of 6 PNe
M. Belén Mari, Denise R. Gonçalves, Stavros Akras
Here we present the spatially resolved study of six Galactic planetary nebulae (PNe), namely IC 4593, Hen 2-186, Hen 2-429, NGC 3918, NGC 6543 and NGC 6905, from intermediate-resol…
Spectroscopic Analysis Tool for intEgraL fieLd unIt daTacubEs (satellite): Case studies of NGC 7009 and NGC 6778 with MUSE
S. Akras, H. Monteiro, J. R. Walsh +11
Integral field spectroscopy (IFS) provides a unique capability to spectroscopically study extended sources over a 2D field of view, but it also requires new techniques and tools. I…
On the discovery of stars, quasars, and galaxies in the Southern Hemisphere with S-PLUS DR2
L. Nakazono, C. Mendes de Oliveira, N. S. T. Hirata +25
This paper provides a catalogue of stars, quasars, and galaxies for the Southern Photometric Local Universe Survey Data Release 2 (S-PLUS DR2) in the Stripe 82 region. We show that…
Discovery of five new Galactic symbiotic stars in the VPHAS+ survey
Stavros Akras, Denise R. Gonçalves, Alvaro Alvarez-Candal +1
We report the validation of a recently proposed infrared selection criterion for symbiotic stars (SySts). Spectroscopic data were obtained for seven candidates, selected from the S…
First 3D Morpho-Kinematic model of Supernova Remnants. The case of VRO 42.05.01 (G 166.0+4.3)
Sophia Derlopa, Panos Boumis, Alexandros Chiotellis +2
We present the first three dimensional (3D) Morpho-Kinematic (MK) model of a supernova remnant (SNR), using as a case study the Galactic SNR VRO 42.05.01. We employed the astrophys…
H emission in the low-ionisation structures of the Planetary Nebulae NGC 7009 and NGC 6543
Stavros Akras, Denise R. Gonçalves, Gerardo Ramos-Larios +1
Despite the many studies in the last decades, the low-ionisation structures (LISs) of planetary nebulae (PNe) still hold several mysteries. Recent imaging surveys have demonstrated…
Exploring the differences of integrated and spatially resolved analysis using integral field unit data: The case of Abell 14
Stavros Akras, Hektor Monteiro, Isabel Aleman +3
We present a new approach to study planetary nebulae using integral field spectroscopy. VLT@VIMOS datacube of the planetary nebula Abell 14 is analysed in three different ways by e…
Distance mapping applied to four well-known planetary nebulae and a nova shell
Sebastian Gómez-Gordillo, Stavros Akras, Denise R. Gonçalves +1
Accurate distance estimates of astrophysical objects such as planetary nebulae (PNe), and nova and supernova remnants, among others, allow us to constrain their physical characteri…
Characterisation of the Planetary Nebula Tc 1 Based on VLT X-Shooter Observations
Isabel Aleman, Marcelo L. Leal-Ferreira, Jan Cami +11
We present a detailed analysis of deep VLT/X-Shooter observations of the planetary nebula Tc 1. We calculate gas temperature, density, extinction, and abundances for several specie…
Compact planetary nebulae: Improved IR diagnostic criteria based on classification tree modelling
Stavros Akras, Lizette Guzman-Ramirez, Denise R. Gonçalves
Planetary nebulae (PNe) are strong H line-emitters and a lot of new PNe discoveries have been made by the SuperCOSMOS AAO/UKST H Survey (SHS) and the Isaac Newton Telescope P…