99 citations · 413 across the 12 of their papers we have counts for
12 papers
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…
A census of symbiotic stars in the 2MASS, WISE and Gaia surveys
Stavros Akras, Lizette Guzman-Ramirez, Marcelo L. Leal-Ferreira +1
We present a new census of Galactic and extragalactic symbiotic stars (SySts). This compilation contains 323 known and 87 candidate SySts. Of the confirmed SySts, 257 are Galactic…
A machine learning approach for identification and classification of symbiotic stars using 2MASS and WISE
Stavros Akras, Marcelo L. Leal-Ferreira, Lizette Guzman-Ramirez +1
In this second paper in a series of papers based on the most-up-to-date catalogue of symbiotic stars (SySts), we present a new approach for identifying and distinguishing SySts fro…
An Imaging Spectroscopic Survey of the Planetary Nebula NGC 7009 with MUSE
J. R. Walsh, A. Monreal-Ibero, M. J. Barlow +6
The spatial structure of the emission lines and continuum over the 50 arcsecond extent of the nearby, O-rich, planetary nebula NGC 7009 (Saturn Nebula) have been observed with the…
The Herschel Planetary Nebula Survey (HerPlaNS) - a comprehensive dusty photoionization model of NGC6781
Masaaki Otsuka, Toshiya Ueta, Peter A. M. van Hoof +9
We perform a comprehensive analysis of the planetary nebula (PN) NGC6781 to investigate the physical conditions of each of its ionized, atomic, and molecular gas and dust component…
Reclassifying symbiotic stars with 2MASS and WISE: An atlas of spectral energy distribution
Stavros Akras, Lizette Guzman-Ramirez, Marcelo Leal-Ferreira +1
We present a new updated catalogue of Galactic and extragalactic symbiotic stars (SySts). Since the last catalogue of SySts (Belczynski et al. 2000), the number of known SySts has…
XSHOOTER spectroscopy of the enigmatic planetary nebula Lin49 in the Small Magellanic Cloud
Masaaki Otsuka, F. Kemper, M. L. Leal-Ferreira +6
We performed a detailed spectroscopic analysis of the fullerene C60-containing planetary nebula (PN) Lin49 in the Small Magellanic Cloud using XSHOOTER at the ESO VLT and the Spitz…
The wonderful complexity of the Mira AB system
S. Ramstedt, S. Mohamed, W. H. T. Vlemmings +17
We have mapped the CO(3-2) line emission around the Mira AB system at 0.5 resolution using the Atacama Large Millimeter/submillimeter Array (ALMA). The CO map shows amazing complex…
The detached dust shells around the carbon AGB stars R Scl and V644 Sco
Matthias Maercker, Sofia Ramstedt, Marcelo M. L. Leal-Ferreira +2
Detached shells are believed to be created during a thermal pulse, and constrain the time scales and physical properties of one of the main drivers of late stellar evolution. We ai…
Magnetic fields around evolved stars: further observations of HO maser polarization
M. L. Leal-Ferreira, W. H. T. Vlemmings, A. Kemball +1
We aim to detect the magnetic field and infer its properties around four AGB stars using HO maser observations. The sample we observed consists of the following sources: the se…
Rotten Egg Nebula: The magnetic field of a binary evolved star
M. L. Leal-Ferreira, W. H. T. Vlemmings, P. J. Diamond +3
Most of PNe are not spherical. The loss of spherical symmetry occurs somewhere between the AGB and PN phase. The cause of this change of morphology is not yet well known, but magne…
Physico-chemical spectroscopic mapping of the planetary nebula NGC 40 and the 2D_NEB, a new 2D algorithm to study ionised nebulae
M. L. Leal-Ferreira, D. R. Gonçalves, H. Monteiro +1
In this paper we present an analysis of the physical and chemical conditions of the planetary nebula NGC 40 through spatially-resolved spectroscopic maps. We also introduce a new a…