Abstract
In previous papers we have published preliminary results on the stellar oxygen-abundance gradient in M33 by using B-type supergiants. In the following study, we determine atmospheric parameters based on analyses of silicon ionisation balance, using detailed non-LTE model atmospheres and non-LTE line formation calculations. Our studies are based on non-LTE models with plane-parallel geometry, in hydrostatic and radiative equilibrium. We will concentrate on a non-LTE differential analysis relative to Galactic standards. Such a differential analysis is used to quantify the differences in metal abundances between M33 stars and MK spectral standards in our Galaxy, ensuring that both have similar parameters.
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References
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Herrero, A., Monteverde, M.I. (1999). Alpha-Elements Differential Abundances in M33 B-Supergiants. In: Walsh, J.R., Rosa, M.R. (eds) Chemical Evolution from Zero to High Redshift. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-48360-1_28
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DOI: https://doi.org/10.1007/978-3-540-48360-1_28
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