The study of very metal-poor dwarf irregular (dIrr) galaxies is fundamental to test the cosmological scenarios of galaxy formation. Among Local Group galaxies, Leo A and SagDIG are probably the most metal-poor dwarfs, as suggested by estimates of their nebular abundances based on the empirical method [I. Saviane, L. Rizzi, E.V. Held, F. Bresolin, Y. Momany in Astron. Astrophys. 390, 59 (2002); E.D. Skillman, R. Terlevich, J. Melnick in Mon. Not. R. Astron. Soc. 240, 563 (1989); L. van Zee, E.D. Skillman, M.P. Haynes in Astrophys. J. 637, 269 (2006)].
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References
Y. Momany, E.V. Held, I. Saviane et al., Astron. Astrophys. 439, 111 (2005)
I. Saviane, L. Rizzi, E.V. Held, F. Bresolin, Y. Momany, Astron. Astrophys. 390, 59 (2002)
E.D. Skillman, R. Terlevich, J. Melnick, Mon. Not. R. Astron. Soc. 240, 563 (1989)
L. van Zee, E.D. Skillman, M.P. Haynes, Astrophys. J. 637, 269 (2006)
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Held, E.V. et al. (2009). VIMOS Integral Field Spectroscopy of Gaseous Nebulae in Local Group Dwarf Galaxies. In: Moorwood, A. (eds) Science with the VLT in the ELT Era. Astrophysics and Space Science Proceedings. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9190-2_4
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