97 citations · 1.3k across the 112 of their papers we have counts for
85 papers · 1 filter
Formation and Evolution of [Wolf-Rayet] Planetary Nebulae through a Late Thermal Pulse
J. B. Rodríguez-González, R. Orozco-Duarte, J. A. Toalá +5
We present the first radiation-hydrodynamical simulations of the formation of a born-again planetary nebula (PN) triggered by a late thermal pulse (LTP). The 2D radiation-hydrodyna…
Formation and X-ray emission from hot bubbles in planetary nebulae - III. The impact of [Wolf-Rayet]-type winds
Rogelio Orozco-Duarte, Jesús A. Toalá, S. Jane Arthur +3
We use radiation-hydrodynamical simulations to investigate the formation and synthetic X-ray emission of hot bubbles within planetary nebulae (PNe) driven by the powerful winds of…
Magnetic fields in planetary nebulae detected through non-thermal radio continuum emission
Marcin Hajduk, Timothy Shimwell, Glenn White +3
Context. Planetary nebulae are shells ejected by low- and intermediate-mass stars. The slow wind ejected by the asymptotic giant branch star is compressed by a fast stellar wind to…
Planetary Nebula Evolution for Single Stellar Models. The Formation of Neutral Spikes
Guillermo Garcia-Segura, Arturo Manchado, Jesus A. Toala +2
Two-dimensional hydrodynamical simulations are presented from the formation up to the late evolution of planetary nebula, for 6 different stellar models from 1 to 5 Mo. The hydrody…
Entering the Wind Roche Lobe Overflow realm in Symbiotic Systems
R. F. Maldonado, J. A. Toalá, E. Tejeda +1
We present a suite of dynamical simulations designed to explore the orbital and accretion properties of compact (27 AU) symbiotic systems, focusing on wind accretion, drag force…
CGCS 6306, another X-ray-emitting asymptotic giant branch star confirmed to be a symbiotic binary
Jaroslav Merc, Martín A. Guerrero, Jesús A. Toalá +1
A number of asymptotic giant branch (AGB) stars are known to exhibit UV excess and/or X-ray emission. These have been considered signposts of a hot white dwarf (WD) companion in a…
A morphological catalogue of Nova Remnants
Edgar Santamaria, Martin A. Guerrero, Gerardo Ramos-Larios +2
This work presents the first optical imaging catalogue of resolved Galactic nova remnants. It compiles images from proprietary observations carried out at the Nordic Optical Telesc…
The impact of wind accretion in Evolving Symbiotic Systems
R. F. Maldonado, J. A. Toalá, J. B. Rodríguez-González +1
We investigate the impact of geometric corrections to the Bondi-Hoyle-Lyttleton (BHL) accretion scheme applied to evolving symbiotic systems. We model systems where 0.7 and 1 M$_\o…
VLT VIMOS Integral Field Spectroscopy of the nova remnant FH Ser
M. A. Guerrero, E. Santamaria, L. Takeda +4
FH Ser experienced a slow classical nova outburst in February 1970 that was the first one observed at UV, optical, and IR wavelengths. Its nova remnant is elliptical in shape, with…
Y Gem, a symbiotic star outshone by its asymptotic giant branch primary component
M. A. Guerrero, D. A. Vasquez-Torres, J. B. Rodríguez-González +2
A considerable number of asymptotic giant branch (AGB) stars exhibit UV excess and/or X-ray emission that indicates a binary companion. AGB stars are so bright that they easily out…
Confirmation of the planetary nebula nature of HaTr 5. Not the remnant of Nova Sco 1437
M. A. Guerrero, E. Santamaria, G. Liberato +6
The identification of the nebula HaTr 5 with the shell remnant of the historic Nova Sco 1437 around the low-accretion rate cataclysmic variable 2MASS J17022815-4306123 has been use…
Accretion onto WD 2226210, the central star of the Helix Nebula
S. Estrada-Dorado, M. A. Guerrero, J. A. Toalá +4
The central star of the Helix Nebula, WD 2226210 presents enigmatic hard X-ray emission and mid-IR excess. The latter has been attributed to a dusty disk or a cloud-like structu…
The impact of periastron passage on the X-ray and optical properties of the Symbiotic System R Aquarii
D. A. Vásquez-Torres, J. A. Toalá, A. Sacchi +4
Multi-epoch Chandra and XMM-Newton observations of the symbiotic system R Aquarii (R Aqr) spanning 22 yr are analysed by means of a reflection model produced by an accretion disc.…
Sakurai's object: a [WC] star in a new bipolar nebula after a VLTP
Griet Van de Steene, Peter van Hoof, Stefan Kimeswenger +5
Optical spectra of the Very Late Thermal Pulse (VLTP) object V4334 Sgr have shown a rapidly changing spectrum resulting from shocks in the outflow, which created a new bipolar nebu…
Non-thermal radio emission in Sakurai's Object
Marcin Hajduk, Peter A. M. van Hoof, Albert A. Zijlstra +5
The very late thermal pulse (VLTP) affects the evolution of 20\% of 1--8\, stars, repeating the last phases of the red giant within a few years and leading t…
Asymptotic giant branch stars in the eROSITA-DE eRASS1 catalog
Martin A. Guerrero, Rodolfo Montez, Roberto Ortiz +2
AGB stars are not expected to be X-ray-emitters, yet a small fraction of them, the so-called X-AGBs, show X-ray emission that can be attributed to coronal activity of a companion o…
Peering into the Wolf-Rayet phenomenon through [WO] and [WC] stars
Jesús A. Toalá, Helge Todt, Andreas A. C. Sander
Spectroscopic observations have shown for decades that the Wolf-Rayet (WR) phenomenon is ubiquitous among stars with different initial masses. Although much effort to understand th…
Shaping the nebula around the symbiotic system R Aquarii
E. Santamaría, J. A. Toalá, T. Liimets +4
We present an analysis of high-dispersion spectroscopic observations of the symbiotic system R Aquarii (R Aqr) obtained with the Manchester Echelle Spectrograph (MES) at the 2.1 m…
3D physical structure and angular expansion of the remnant of the recurrent nova T Pyx
E. Santamaría, J. A. Toalá, M. A. Guerrero +2
We present the analysis of archival Very Large Telescope (VLT) MUSE and multi-epoch Hubble Space Telescope (HST) WFPC2 and WFC3/UVIS narrow-band observations of the remnant associa…
Optical tomography of the born-again ejecta of A 58
B. Montoro-Molina, D. Tafoya, M. A. Guerrero +2
In a born-again planetary nebula (PN), processed H-deficient material has been injected inside the old, H-rich nebula as a result of a very late thermal pulse (VLTP) event. Long-sl…
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…
Synthetic X-ray emission from white dwarf accreting planetary material
S. Estrada-Dorado, V. Lora, J. A. Toalá +4
The emission of hard X-rays associated with white dwarfs (WD) can be generated by the presence of a stellar companion either by the companion's coronal emission or by an accretion…
Spatially-resolved spectroscopic investigation of the born-again planetary nebula A 78
B. Montoro-Molina, M. A. Guerrero, J. A. Toalá
We present the analysis of spatially-resolved spectroscopic observations of the born-again planetary nebula (PN) A 78 that are used to investigate the chemistry and physical proper…
The heart of Sakurai's Object revealed by ALMA
Daniel Tafoya, Peter A. M. van Hoof, Jesus A. Toala +7
We present high angular-resolution observations of Sakurai's object using the Atacama Large Millimeter Array, shedding new light on its morpho-kinematical structure. The millimetre…