VizieR Online Data Catalog: Spectra quality impact on nebular abundances (Rodriguez, 2020)
Abstract
The sample consists of 179 optical spectra of 42 PNe, each of them with 3-7 spectra. The spectra were compiled from the literature by looking for PNe that have three or more available spectra that contain: at least one working density diagnostic (from among [SII]λ6716/λ6731, [OII]λ3726/λ3729, [ClIII]λ5518/λ5538, and [ArIV]λ4711/λ4740), the two most used temperature diagnostics ([OIII]λ4363/(λ4959+λ5007) and [NII]λ5755/(λ6548+λ6583)), and the [OII]λ3727 lines.
The [OII] lines are required for the calculation of the total abundances not only of oxygen, but of most of the other elements through the use of ionization correction factors (see, e.g. Delgado-Inglada, Morisset & Stasinska 2014MNRAS.440..536D). The O+ abundance can be calculated using either the [OII]λ3727 lines or the [OII]λ7325 lines. The red [OII] lines are weaker than their blue counterparts and can be severely contaminated by telluric emission lines. The blue [OII] lines are not without problems, since they lie in a spectral region where instruments can have a low efficiency and the effects of atmospheric differential refraction might be important (Filippenko 1982PASP...94..715F), but they seem a safer bet. The sample objects are Galactic PNe, although the halo PN BoBn 1 might be located in the Sagittarius dwarf spheroidal galaxy (Zijlstra et al. 2006MNRAS.369..875Z). These objects and the spectra used for their analysis are listed in Tables B1-B5. (6 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- June 2023
- Bibcode:
- 2023yCat..74951016R
- Keywords:
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- Planetary nebulae;
- Milky Way;
- Abundances: peculiar;
- Spectra: optical