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Chapter and Conference Paper
Local Group Census: The Dwarf Irregular Galaxy NGC6822
In the framework of the Local Group Census (LGC), an imaging programme to search for emission line objects in the Local Group, we present the detection of 13 new candidate planetary nebulae (PNe) and follow-up...
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Chapter and Conference Paper
Local Group Census: The Dwarf Irregular Galaxy NGC6822
In the framework of the Local Group Census (LGC), an imaging programme to search for emission line objects in the Local Group, we present the detection of 13 new candidate planetary nebulae (PNe) and follow-up...
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Article
A Closer View of the Nucleus of NGC 4314
We present a high-resolution kinematical study of the ionized gas in the circumnuclear region of NGC 4314. Our spectra reveal the presence of a central structure (apparently a ring or torus) located at ∼ 2 arc...
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Chapter
Are Microstructures in the Outer Shells of PNe Fossil Condensations of the AGB Wind?
Some planetary nebulae (PNe) show microstructures of low ionization located in their outer regions, i.e. external to the bright rim defined by the fast vs. slow wind interaction region. Morphological and kinem...
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Chapter and Conference Paper
Multiwavelength Kinematics of the PNe Humason 1–2 and NGC 7662
The conventional interpretation of the “Wilson effect”is based on the fact that, in a simple photoionization model of a thick shell in free expansion, the elements with a high ionization potential are found in...
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Article
Shock modelling of Planetary Nebulae
The kinematics of Planetary Nebulae are analyzed in terms of the solutions to the equations of hydrodynamic equilibrium developed by J. Cantó. We apply our analysis to the Planetary Nebulae NGC 6905 and NGC 65...
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Chapter
Shock Modelling of Planetary Nebulae
The kinematics of Planetary Nebulae are analyzed in terms of the solutions to the equations of hydrodynamic equilibrium developed by J. Cantó. We apply our analysis to the Planetary Nebulae NGC 6905 and NGC 65...
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Chapter and Conference Paper
Kinematics of the Planetary Nebula Hb 5.
The planetary nebula Hubble 5 shows a very striking bi-symmetry; a 180° rotation around its center would bring the object into fair coincidence. Similar to this nebula is NGC 6537 and, to a lesser degree, NGC ...
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Article
Molecular and low excitation emission in high mass post-main-sequence nebulae
We have undertaken map** and spectroscopy of a broad range of type I post-Main-Sequence nebulae in COJ=1→0,J=2→1, andJ=3→2, using the 12 m antenna at Kitt Peak, and the 45 m facility of the Nobeyama Radio Obser...
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Article
A carbon star outflow envelope about IC 418
We present the results of near-infrared map**, optical spectroscopy, and millimetric COJ+2-1 observations of the halo about IC 418. As a result, we confirm that NIR emission extends outside of the principal emi...
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Article
High-velocity outflows in post-Main-Sequence nebulae
We present observations of three post-Main-Sequence nebulae taken with an intermediate despersion spectrograph mounted on the 2.5 m Isaac Newton Telescope (La Palma, Spain). Our results reveal evidence for hig...
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Article
New insights into a familiar friend: COJ=2–1 map** of the bipolar outflow source NGC 1333 (HH 7–11)
We have observed the bipolar outflow source NGC 1333 (HH 7–11) in theJ=2–1 transition of12CO, and find evidence for a strong westerly termination of the red outflow lobe at a velocityV lsr ...
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Article
Shocked excitation in the bipolar nebula CRL 618
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Article
Type Ia supernovae observed at La Palma Observatory: Looking for differences within a recent sample
A sample of recent type Ia supernovae has been observed from La Palma. Spectra of there supernovae were taken at two different phases: around maximum and between one and two months after maximum. We present he...
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Article
Abundance gradient for 13 planetary nebulae in the Galaxy
Via optical low-resolution long slit spectroscopy conducted at the 2.5 m INT in La Palma, He, O, N, Ne, A, and S abundances in 13 extended PN were calculated. The analysis of these results allowed us to infer ...
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Article
The location of optically thin CO emission in M82
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Chapter and Conference Paper
An Infrared Search for New Planetary Nebulae
We present the first results of a large scale infrared search for new planetary nebulae. More than 1000 unidentified sources were selected from the IRS PSC having infrared colours similar to those of known PN’...
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Chapter and Conference Paper
High Velocity Outflows in Post-Main Sequence Nebulae
We have observed a broad range of post-main-sequence, type I and irregular nebulae using the intermediate dispersion spectrograph of the Isaac Newton Telescope (La Palma, Spain). Many of these show evidence fo...
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Chapter and Conference Paper
The Halos of NGC 6543 and NGC 6826
Long slit low resolution (3.4 A) spectra of the planetary nebulae NGC 6543 and NGC 6826, obtained using the 2.5-m Isaac Newton Telescope (La Palma) with the Image Photon Counting System (IPCS), indicate differ...
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Chapter and Conference Paper
High Resolution Long-Slit Spectroscopy of A78
High spectral resolution bidimensional spectroscopy of A78 in the He II λ4686 A, H λ4861 A, [O III] λ4959 A and [O III] λ5007 A lines is reported, confirming the different morphology of the nebula in these lin...
