Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-21
Astron.Astrophys. 415 (2004) 55-61
Astronomy and Astrophysics
Astrophysics
Accepted by A&A
Scientific paper
10.1051/0004-6361:20034592
We present a FUSE spectroscopic study of the nearby gas--rich, metal--deficient blue compact dwarf (BCD) galaxy IZw 36. Atomic hydrogen and many metal lines are observed in absorption against the stellar continuum of young, massive stars embedded in the ionized region. Profile fitting of absorption lines allowed us to determine abundances and investigate the chemical composition of the neutral gas. This study present strong evidences that nitrogen is 16 (+7 -8) times less abundant in the neutral gas with respect to the ionized gas (all uncertainties are 2 sigma. Similarly, the oxygen abundance estimated using phosphorus as a tracer is lower in the neutral gas by a factor 8 (+17 -5). We also find that argon is underabundant by a factor 32 (+8 -7) and that log (ArI/OI) < -3.0 which is inconsistent with the solar value -2.1 (+0.1 -0.1) (Lodders2003), implying that argon is likely ionized into ArII in the neutral medium.
des Etangs Alain Lecavelier
Desert Jean-Michel
Hebrard Guillaume
Kunth Daniel
Lebouteiller Vianney
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