Issue |
A&A
Volume 436, Number 1, June II 2005
|
|
---|---|---|
Page(s) | L1 - L4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200500108 | |
Published online | 20 May 2005 |
Letter to the Editor
On the relationship between auroral and nebular oxygen line intensities in spectra of H II regions
Main Astronomical Observatory of National Academy of Sciences of Ukraine, 27 Zabolotnogo str., 03680 Kiev, Ukraine e-mail: pilyugin@mao.kiev.ua
Received:
January
1900
Accepted:
10
April
2005
We investigate relationships between observed auroral and nebular oxygen line fluxes in spectra of H ii regions. We find a relation that is metallicity-dependent at low metallicities, but becomes independent of metallicity (within the uncertainties of the available data) above 12+logO/H ~ 8.25, i.e. there is one-to-one correspondence (the ff-relation) between auroral and nebular oxygen line fluxes in spectra of high-metallicity H ii regions. The ff-relation allows one to estimate the flux in the auroral line from strong oxygen line measurements only. This solves the problem of the electron temperature (and, consequently, abundance) determination in high-metallicity H ii regions. The ff-relation confirms the basic idea of the “empirical” method, proposed by Pagel et al. (1979, MNRAS, 189, 95) a quarter of a century ago, that the oxygen abundance in H ii region can be esimated from the strong oxygen lines measurements only.
Key words: galaxies: ISM / ISM: H ii region: abundances
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.