Abundances in planetary nebulae
| Autor: | Stuart Pottasch, Jeronimo Bernard-Salas, T. L. Roellig, R. Surendiranath |
|---|---|
| Přispěvatelé: | Kapteyn Astronomical Institute |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Reflection nebula
Astrophysics::High Energy Astrophysical Phenomena Extinction (astronomy) ARGON ABUNDANCES SULFUR Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics ISM: abundances Protoplanetary nebula planetary nebulae: individual: NGC2792 CHLORINE Emission nebula Spitzer Space Telescope Astrophysics::Solar and Stellar Astrophysics SPECTRA Stellar evolution Astrophysics::Galaxy Astrophysics DISTANCES SPITZER-SPACE-TELESCOPE Physics infrared: ISM Nebula Astronomy Astronomy and Astrophysics Planetary nebula CATALOG ISM: lines and bands Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics CENTRAL STARS SOUTHERN SAMPLE INFRARED SPECTROGRAPH |
| Zdroj: | Astronomy & astrophysics, 502(1), 189-197. EDP Sciences |
| ISSN: | 0004-6361 1432-0746 |
| DOI: | 10.1051/0004-6361/200912076 |
| Popis: | The mid-infrared spectrum of the rather circular planetary nebula NGC2792 taken with the Spitzer Space Telescope is presented. This spectrum is combined with the ultraviolet IUE spectrum and with the spectrum in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebula is then calculated in two ways. First by directly calculating and adding individual ion abundances, and secondly by building a model nebula that attempts to reproduce the observed spectrum. Because it is now possible to include the nebular temperature gradient, the chemical composition is more accurate than has been given earlier in the literature. Discussion of both the central star and the evolution of the star-nebula is then given. |
| Databáze: | OpenAIRE |
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