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Neutron-capture element abundances in the planetary nebula NGC 5315 from deep optical and near-infrared spectrophotometry
S. Madonna, J. García-Rojas, N. C. Sterling +5
We analyze the chemical composition of the planetary nebula (PN) NGC 5315, through high-resolution (R = 40000) optical spectroscopy with UVES at the Very Large Telescope, and mediu…
Identification of Near-Infrared [Se III] and [Kr VI] Emission Lines in Planetary Nebulae
N. C. Sterling, S. Madonna, K. Butler +5
We identify [Se III] 1.0994 micron in the planetary nebula (PN) NGC 5315 and [Kr VI] 1.2330 micron in three PNe, from spectra obtained with the FIRE spectrometer on the 6.5-m Baade…
Neutron-capture element abundances in the planetary nebula NGC 5315 from deep high-resolution optical and near-IR spectrophotometry
S. Madonna, J. García-Rojas, N. C. Sterling +1
We have done a spectroscopical analysis of the type I planetary nebula (PN) NGC 5315, through high-resolution (R40000) optical spectroscopy with UVES at the 8.2m Very Large T…
Neutron-Capture Element Abundances in Magellanic Cloud Planetary Nebulae
A. L. Mashburn, N. C. Sterling, S. Madonna +3
We present near-infrared spectra of ten planetary nebulae (PNe) in the Large and Small Magellanic Clouds (LMC and SMC), acquired with the FIRE and GNIRS spectrometers on the 6.5-m…
A window on the efficiency of the s-process in AGB stars: chemical abundances of n-capture elements in the planetary nebula NGC 3918
S. Madonna, J. García-Rojas, V. Luridiana +2
The chemical content of the planetary nebula NGC 3918 is investigated through deep, high-resolution (R~40000) UVES at VLT spectrophotometric data. We identify and measure more than…
S-process enrichment in the planetary nebula NGC 3918. Results from deep echelle spectrophotometry
J. García-Rojas, S. Madonna, V. Luridiana +4
(Abridged) The chemical content of the planetary nebula NGC 3918 is investigated through deep, high-resolution UVES at VLT spectrophotometric data. We identify and measure more tha…
s-process Enrichment in the Planetary Nebula NGC 3918
J. García-Rojas, S. Madonna, V. Luridiana +2
We present deep, high-resolution (R~40000) UVES at VLT spectrophotometric data of the planetary nebula NGC 3918. This is one of the deepest spectra ever taken of a planetary nebula…