Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..32k&link_type=abstract
Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have analysed long-slit spectrophotometric observations of a sample of 35 H II galaxies in the red (between 6000Å and 1 μm), including the nebular [S III] λλ9069,9532Å lines. For 6 of the 35 objects observed it has been possible to measure the auroral [S III] line at 6312Å. All of these galaxies were observed previously in the blue, and it has therefore been possible to derive two line temperatures directly: t([O III]) from the [O III] λ4363Å line and t([S III]) from the [S III] λ6312Å line. Both spectra, red and blue, were obtained on the 1.52m telescope with the Boller & Chivens spectrograph at La Silla, ESO. In this work, we present the physical conditions and chemical abundances of these 6 galaxies derived from the measured [S III]λ6312Å line, with particular emphasis on the S/H abundance. Despite the observed dispersion in the temperatures, the final result for the abundances is in accordance with the expected values for H II galaxies. In addition, we have added our observed H II galaxies to the empirical calibration of
the metallicity parameter, S23 = ([S II]+[S III])/Hα (Pérez-Montero & Díaz 2003). This calibration presents two important advantages with respect to the R23 parameter, which is based on the optical oxygen lines: it remains single-valued up to abundances close to solar and is almost independent of the ionization parameters of the nebula.
Cuisinier Francois
Kehrig Carolina
Perez Emanuelle
Telles Eduardo
Vilchez José M.
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