![Izquierda - Imagen RGB de la nebulosa de Orión y M43 obtenida filtros estrechos con la cámara WFC en el INT: H alfa (rojo), [S II] 6716+30 (verde), [O III] 5007 (azul). Derecha - Imagen en falso color de la nebulosa planetaria NGC 6778. En azul se ve la emisión en la línea de O II tomada con el filtro sintonizable azul del instrumento OSIRIS en el GTC; en verde imagen con el filtro estrecho de [O III] del Nordic Optical Telescope (NOT).](https://webpro-cms.ll.iac.es/sites/default/files/styles/color/public/images/project/imagen_web.jpg?itok=mgPK3oTc "Izquierda - Imagen RGB de la nebulosa de Orión y M43 obtenida filtros estrechos con la cámara WFC en el INT: H alfa (rojo), [S II] 6716+30 (verde), [O III] 5007 (azul). Derecha - Imagen en falso color de la nebulosa planetaria NGC 6778. En azul se ve la emisión en la línea de O II tomada con el filtro sintonizable azul del instrumento OSIRIS en el GTC; en verde imagen con el filtro estrecho de [O III] del Nordic Optical Telescope (NOT).")
Start year
1986
Organizational Unit
Organizing institutions
General
Description
The research that is being carried out by the group can be condensed into two main lines:
1) Study of the structure, dynamics, physical conditions and chemical evolution of Galactic and extragalactic ionized nebulae through detailed analysis and modelization of their spectra. Investigation of chemical composition gradients along the disk of our Galaxy and in nearby galaxies.
2) Determine the physical-chemical conditions of galactic planetary nebulae with bipolar geometry and nebulae around symbiotic stars. The aim is to understand the origin of bipolarity and to test theoretical models that attempt to explain nebular morphology and kinematics, with special emphasis on models with central binary stars. We will also study the implications of the evolution of binary systems in other astrophysical scenarios, such as the formation of jets, cataclysmic variables, and nova and supernova-type explosions.
Members
Principal investigator
Jorge
García Rojas
Project manager
César
Esteban López
Project staff
David
Jones
Antonio
Mampaso Recio
Collaborators
Dr.
Miguel Cerviño Saavedra
Dr.
A.R. López Sánchez
Dr.
F. Bresolin
Dr.
G. Delgado Inglada
Dr.
G. Domínguez Guzmán
Dr.
X. Fang
Dr.
N.C. Sterling
Dr.
R. Wesson
Dr.
H. Monteiro
Dr.
H. Boffin
Dra.
Karla Z. Arellano Córdoba
Dr.
M. Miller Bertolami
Dra.
Grazyna Stasinska
Dr.
T. Hillwig
Dr.
B. Miszalski
Dr.
M. Santander García
Dra.
E. Villaver
Dra.
L. Magrini
Dr.
S. Akras
Prof.
J. Drew
Prof.
B. Balick
Dr.
D. R. Gonçalves
Dra.
K. Kwitter
Dr.
A. Prsa
Results
- Using EMIR/GTC spectra in the near infrared range, tellurium and bromine emission lines have been detected for the first time in two planetary nebulae. These heavy element detections in one of their places where they are formed, give us information about the abundance patterns of heavy elements owing to the r-process and the s-process.
Scientific activity
Related publications
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Atomic Data Assessment with PyNebPyNeb is a Python package widely used to model emission lines in gaseous nebulae. We take advantage of its object-oriented architecture, class methods, and historical atomic database to structure a practical environment for atomic data assessment. Our aim is to reduce the uncertainties in parameter space (line-ratio diagnostics, electron densityMorisset, Christophe et al.
Advertised on:
102020 -
A plague of magnetic spots among the hot stars of globular clustersFor more than six decades, the quest to understand the formation of hot (about 20,000-30,000 K) extreme horizontal branch (EHB) stars in Galactic globular clusters has remained one of the most elusive in stellar evolutionary theory. Here we report on two discoveries that challenge the idea of the stable luminosity of EHB stars. The first mode ofMomany, Y. et al.
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62020 -
Physics of Eclipsing Binaries. V. General Framework for Solving the Inverse ProblemPHOEBE 2 is a Python package for modeling the observables of eclipsing star systems, but until now it has focused entirely on the forward model—that is, generating a synthetic model given fixed values of a large number of parameters describing the system and the observations. The inverse problem, obtaining orbital and stellar parameters givenConroy, Kyle E. et al.
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102020 -
The post-common-envelope binary central star of the planetary nebula PN G283.7-05.1. A possible post-red-giant-branch planetary nebula central starWe present the discovery and characterisation of the post-common-envelope central star system in the planetary nebula PN G283.7-05.1. Deep images taken as part of the POPIPlaN survey indicate that the nebula may possess a bipolar morphology similar to other post-common-envelope planetary nebulae. Simultaneous light and radial velocity curveJones, D. et al.
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102020 -
The post-common-envelope binary central star of the planetary nebula ETHOS 1We present a detailed study of the binary central star of the planetary nebula ETHOS 1 (PN G068.1+11.0). Simultaneous modelling of light and radial velocity curves reveals the binary to comprise a hot and massive pre-white dwarf with an M-type main-sequence companion. A good fit to the observations was found with a companion that follows expectedMunday, James et al.
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92020 -
A study of extragalactic planetary nebulae populations based on spectroscopy. I. Data compilation and first findingsWe 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 the first paper of a series that aims to analyse the PN populations and their progenitors in these galaxies. Although the samples are not complete or homogeneous, weDelgado-Inglada, G. et al.
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92020 -
Abell 30 - A binary central star among the born-again planetary nebulaeEight planetary nebulae have been identified as 'born-again', a class of object typified by knotty secondary ejecta having low masses (${\sim}10^{-4}$ M ☉) with nearly no hydrogen. Abell 30, the archetype of the class, also belongs to a small subset of planetary nebulae that exhibit extreme abundance discrepancy factors (where Abell 30 is the mostJacoby, George H. et al.
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82020 -
The impact of strong recombination on temperature determination in planetary nebulaeThe long-standing difference in chemical abundances determined from optical recombination lines and collisionally excited lines raises questions about our understanding of atomic physics, as well as the assumptions made when determining physical conditions and chemical abundances in astrophysical nebulae. Here, we study the recombinationGómez-Llanos, V. et al.
Advertised on:
72020 -
The Galactic radial abundance gradients of C, N, O, Ne, S, Cl, and Ar from deep spectra of H II regionsWe present a reassessment of the radial abundance gradients of C, N, O, Ne, S, Cl, and Ar in the Milky Way using deep spectra of 33 H II regions gathered from the literature, covering Galactocentric distances from 6 to 17 kpc. The distances of the objects have been revised using Gaia parallaxes. We recalculate the physical conditions and ionicArellano-Córdova, K. Z. et al.
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62020 -
Tidally trapped pulsations in a close binary star system discovered by TESSIt has long been suspected that tidal forces in close binary stars could modify the orientation of the pulsation axis of the constituent stars. Such stars have been searched for, but until now never detected. Here we report the discovery of tidally trapped pulsations in the ellipsoidal variable HD 74423 in Transiting Exoplanet Survey SatelliteHandler, G. et al.
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32020 -
Helium abundances and its radial gradient from the spectra of H II regions and ring nebulae of the Milky WayWe determine the radial abundance gradient of helium in the disc of the Galaxy from published spectra of 19 H II regions and ring nebulae surrounding massive O-type stars. We revise the Galactocentric distances of the objects considering Gaia DR2 parallaxes (Gaia Collaboration 2018) and determine the physical conditions and the ionic abundance ofMéndez-Delgado, J. E. et al.
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62020 -
IGAPS: the merged IPHAS and UVEX optical surveys of the northern Galactic planeThe INT Galactic Plane Survey (IGAPS) is the merger of the optical photometric surveys, IPHAS and UVEX, based on data from the Isaac Newton Telescope (INT) obtained between 2003 and 2018. Here, we present the IGAPS point source catalogue. It contains 295.4 million rows providing photometry in the filters, i, r, narrow-band Hα, g, and U RGO. TheMonguió, M. et al.
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62020 -
The single-sided pulsator CO CamelopardalisCO Cam (TIC 160268882) is the second 'single-sided pulsator' to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO Cam is a binary star comprised of an Am δ Sct primary star with T eff = 7070 ± 150 K, and a spectroscopically undetected G main-sequence secondary starKurtz, D. W. et al.
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42020 -
AT 2019abn: multi-wavelength observations over the first 200 daysContext. AT 2019abn was discovered in the nearby M51 galaxy by the Zwicky Transient Facility at more than two magnitudes and around three weeks prior to its optical peak. Aims: We aim to conduct a detailed photometric and spectroscopic follow-up campaign for AT 2019abn, with early discovery allowing for significant pre-maximum observations of anWilliams, S. C. et al.
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52020 -
Physics of Eclipsing Binaries. IV. The Impact of Interstellar Extinction on the Light Curves of Eclipsing BinariesTraditionally, the effects of interstellar extinction on binary star light curves have been treated as a uniform reduction in the observed brightness of the system that is independent of the orbital phase. However, unless the orbital plane of the system coincides with the plane of the sky, or if the two stars are completely identical and presentJones, David et al.
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42020 -
Planetary nebulae seen with TESS: Discovery of new binary central star candidates from Cycle 1Context. It has become clear in recent years that binarity plays a crucial role in many aspects of planetary nebulae (PNe), particularly with regard to the striking morphologies they exhibit. To date, there are nearly 60 known binary central stars of PNe (bCSPNe). However, both theory and observation indicate that this figure represents only theAller, A. et al.
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32020 -
Ondřejov Echelle Spectrograph, Ground Based Support Facility for Exoplanet MissionsFulfilling the goals of space-based exoplanetary transit surveys, like Kepler and TESS, is impossible without ground-based spectroscopic follow-up. In particular, the first-step vetting of candidates could easily necessitate several hundreds of hours of telescope time—an area where 2 m class telescopes can play a crucial role. Here, we describe theKabáth, P. et al.
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32020 -
Carbon, nitrogen, and oxygen abundance gradients in M101 and M31We present deep spectrophotometry of 18 H II regions in the nearby massive spiral galaxies M 101 and M 31. We have obtained direct determinations of electron temperature in all the nebulae. We detect the C II 4267 Å line in several H II regions, permitting to derive the radial gradient of C/H in both galaxies. We also determine the radial gradientsEsteban, C. et al.
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12020 -
On the triple-star origin of the planetary nebula Sh 2-71Recent studies have indicated that triple-star systems may play a role in the formation of an appreciable number of planetary nebulae, however, only one triple central star is known to date (and that system is likely too wide to have had much influence on the evolution of its component stars). Here, we consider the possibility that Sh 2-71 wasJones, David et al.
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102019 -
First Evidence of Enhanced Recombination in Astrophysical Environments and the Implications for Plasma DiagnosticsWe report the first unambiguous observational evidence of Rydberg Enhanced Recombination (RER), a potentially important recombination mechanism that has hitherto been unexplored in low-temperature photoionized plasmas. RER shares similarities with dielectronic recombination, with the difference that the electron is captured into a highly excitedNemer, A. et al.
Advertised on:
122019
