First Evidence of Enhanced Recombination in Astrophysical Environments and the Implications for Plasma Diagnostics

Autor: Ahmad Nemer, Jorge García-Rojas, Andrea K. Dupree, John C. Raymond, Michael S. Pindzola, Connor Ballance, Qianxia Wang, Stuart Loch, Nicholas C. Sterling

Publikováno v: Nemer, A, Sterling, N C, Raymond, J, Dupree, A K, García-Rojas, J, Wang, Q, Pindzola, M S, Ballance, C & Loch, S D 2019, ' First Evidence of Enhanced Recombination in Astrophysical Environments and the Implications for Plasma Diagnostics ', The Astrophysical Journal Letters, vol. 887, no. 1, L9 . https://doi.org/10.3847/2041-8213/ab5954

We 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 di

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16b7ceebcb40bcf2d60c2a8e2adc7a89
https://pure.qub.ac.uk/en/publications/first-evidence-of-enhanced-recombination-in-astrophysical-environments-and-the-implications-for-plasma-diagnostics(d0831a7a-70bf-4334-a58c-e32cf332d78b).html

s-process enrichment in the planetary nebula NGC 3918. Results from deep echelle spectrophotometry

Autor: S. Madonna, Christophe Morisset, V. Luridiana, Jorge García-Rojas, L. Toribio San Cipriano, Gloria Delgado-Inglada, Nicholas C. Sterling

Publikováno v: Monthly Notices of the Royal Astronomical Society. 452:2606-2640

(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 than 750 emission lines, making ours one of the deepest spectra ever take

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62bdcab3595e0faf09caf7651c9818b2
https://doi.org/10.1093/mnras/stv1415

Identification of Near-Infrared [Se III] and [Kr VI] Emission Lines in Planetary Nebulae

Autor: Jorge García-Rojas, Nicholas C. Sterling, A. L. Mashburn, S. Madonna, V. Luridiana, Ian U. Roederer, K. Butler, Christophe Morisset

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 Telescope. Se and Kr are the two most widely-detected neutron-capture

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::587520faa52039ede3351b888e11bcec
http://arxiv.org/abs/1704.00741

Atomic Data and Neutron-Capture Element Abundances in Planetary Nebulae

Autor: Nicholas C. Sterling

Neutron(n)-capture elements are produced by s-process nucleosynthesis in low- and intermediate-mass AGB stars, and therefore can be enriched in planetary nebulae (PNe). In the last ten years, n-capture elements have been detected in more than 100 PNe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ff5d603479eeeb62ebb195b9ca34e2a

The Abundances of Light Neutron-Capture Elements in Planetary Nebulae III. The Impact of New Atomic Data on Nebular Selenium and Krypton Abundance Determinations

Autor: R. L. Porter, Nicholas C. Sterling, Harriet L. Dinerstein

The detection of neutron(n)-capture elements in several planetary nebulae (PNe) has provided a new means of investigating s-process nucleosynthesis in low-mass stars. However, a lack of atomic data has inhibited accurate trans-iron element abundance

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab30c568448d3eee21fa7459f17a28e0