Abundance determination in H ii regions from spectra without the [O ii]lambda 3727+lambda 3729 line

作者：Pilyugin L S^*; Mattsson L

来源：Monthly Notices of the Royal Astronomical Society, 2011, 412(2): 1145-1150.

DOI：10.1111/j.1365-2966.2010.17970.x

• ISM: abundances
• H ii regions
• galaxies: abundances

We suggest an empirical calibration for the determination of oxygen and nitrogen abundances and electron temperature in H ii regions in which the [O ii]lambda 3727+lambda 3729 line (R-2) is not available. The calibration is based on the strong emission lines of O++, N+ and S+ (NS calibration) and derived using the spectra of H ii regions with measured electron temperatures as calibration data points. The NS calibration makes it possible to derive abundances for H ii regions in nearby galaxies from Sloan Digital Sky Survey (SDSS) spectra in which the R-2 line is out of the measured wavelength range, but it can also be used for oxygen and nitrogen abundance determinations in any H ii region independently of whether the nebular oxygen line [O ii]lambda 3727+lambda 3729 is available or not. The NS calibration provides reliable oxygen and nitrogen abundances for H ii regions over the whole range of metallicities.

• 出版日期2011-4