New calibrations for abundance determinations in H ii regions
By L. Pilyugin, E. Grebel. 2016
171 citations recorded by the source corpus.
Simple relations for deriving the oxygen abundance in HII regions with intensities of the three strong emission lines R_2, R_3, and N_2 (R calibration) or S_2, R_3, and N_2 (S calibration) in their spectra are suggested. A sample of 313 reference HII regions of the counterpart method is used as calibrating data points. Relations for the determination of nitrogen abundances, the R calibration, are also constructed. We find that the oxygen and nitrogen abundances in high-metallicity HII regions can be estimated using the intensities of the two strong lines R_2 and N_2 (or S_2 and N_2 for oxygen) only. The corresponding two-dimensional relations are provided. There are considerable advantages of the suggested calibration relations as compared to the existing ones. First, the oxygen and nitrogen abundances estimated through the suggested calibrations agree with the Te-based abundances within ~0.1 dex over the whole metallicity range, i.e., the relative accuracy of the calibration-based abundances is 0.1 dex. Although we constructed distinct relations for high- and low-metallicity objects, the separation between these two can be simply obtained from the intensity of the N_2 line. Moreover, the applicability ranges of the high- and low-metallicity relations overlap for adjacent metallicities, i.e., the transition zone disappears. Second, the oxygen abundances produced by the two suggested calibrations are in remarkable agreement with each other. In fact, the R-based and S-based oxygen abundances agree within ~0.05 dex in the majority of cases for more than three thousand HII region spectra.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/8a7e563ff24215822ed1fe1439c5ff9c0246cef7
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
Citations in the corpus
- De re metallica: the cosmic chemical evolution of galaxies (2018, methodology): “…have been performed empirically, through the direct methods (e.g., Pettini & Pagel, 2004; Pilyugin & Thuan, 2005; Pilyugin et al., 2010b; Pilyugin & Grebel, 2016; Curti et al., 2017), through photoionization models (e.g., Zaritsky et al., 1994; McGaugh, 1991; Kewley & Dopita, 2002;…”
- The lifecycle of molecular clouds in nearby star-forming disc galaxies (2019, methodology): “For this galaxy, we therefore use the slope of the metallicity gradient as measured from MUSE observations (see Kreckel et al. 2019, which use the S-calibration method from Pilyugin & Grebel 2016).”
- New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies (2016, methodology): “…have been previously derived with the Te method (e.g. Pettini & Pagel 2004; Pilyugin & Thuan 2005; Pilyugin et al. 2010b, 2012; Marino et al. 2013; Pilyugin & Grebel 2016), or theoretically, in which oxygen abundance have been inferred via photoionization models (e.g. McGaugh 1991; Zaritsky et…”