The N/O abundance ratio in the lowest-metallicity blue compact dwarf galaxies
/ Authors
Y. Izotov, F. Chaffee, C. Foltz, K. Fricke, R. Green, N. Guseva, K. Noeske, P. Papaderos, T. Observatory, Kyiv
and 11 more authors
Ukraine, W. Observatory, Usa, M. Observatory, Tucson, Universitats-Sternwarte, Goettingen, H Germany, N. A. Observatories, U. Virginia, Charlottesville
/ Abstract
The results of the N/O abundance determination in a sample of low-metallicity blue compact dwarf (BCD) galaxies based on new spectroscopic observations with large telescopes (Keck, VLT, MMT, 4m KPNO) are presented. We show that the N/O abundance ratio is constant at lowest metallicities < Zsun/20, confirming previous findings and strongly supporting the origin of nitrogen as a primary element.
Journal: arXiv: Astrophysics