Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..181r&link_type=abstract
"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present results of long-slit spatially integrated (~ 7 arcmin2) spectroscopy (3600 - 10200 Å in the central regions of Carina, M8 and M20. We obtained two types of spectra: neb \ (pure nebular) and all \ (nebular plus stellar). The stellar effect increases along the Balmer series, with neb/all \ ~ 1.20 at Hdelta, but could be much stronger (~ 1.7) for weaker lines beyond H8. The resulting neb \ dereddened spectra give slightly higher electron temperatures which yield (O/H) smaller (~ 0.10-0.30 dex), (N/H) higher (~ 0.05-0.10 dex), (Ne/H) smaller (~ 0.25-0.40 dex), and (Ar/H) smaller (~ 0.15-0.30 dex), with respect to the all \ case. Although these differences are roughly within the uncertainties, they could be important in deriving accurate chemical compositions in extragalactic nebula where the stars are not resolved.
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