Bibcode
Toribio San Cipriano, L.; Esteban, C.; Domínguez-Guzmán, G.; García-Rojas, J.
Bibliographical reference
Highlights on Spanish Astrophysics IX, Proceedings of the XII Scientific Meeting of the Spanish Astronomical Society held on July 18-22, 2016, in Bilbao, Spain, ISBN 978-84-606-8760-3. S. Arribas, A. Alonso-Herrero, F. Figueras, C. Hernández-Monteagudo, A. Sánchez-Lavega, S. Pérez-Hoyos (eds.), 2017, p. 263-268
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3
2017
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0
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0
Description
We present chemical abundances of carbon (C) and oxygen (O) in the Large
and Small Magellanic Clouds from deep and high-quality optical spectra
of H II regions. The data have been taken using the Ultraviolet-Visual
Echelle Spectrograph at the 8.2-m Very Large Telescope with the goal of
detecting the faint C II and O II recombination lines. For all the
objects of the sample, we determine C^{2+}abundances from recombination
lines and O^{2+} abundances from recombination lines and collisionally
excited lines. In addition, we calculate the abundance discrepancy
factors (ADFs) for O^{2+} and C^{2+}, as well as the O/H, C/H and C/O
ratios. We study the behaviour of the ADF comparing the values obtained
in the Magellanic Clouds with those obtained for other H_{II} regions in
different galaxies. We also compare the nebular and stellar abundances
in two regions of the sample. Finally, we discuss the chemical evolution
of the MCs through the O/H, C/H and C/O radial gradients and the changes
of the C/O ratio as a function of O/H.