http://arxiv.org/abs/1508.00746
Preliminary results are presented from spectroscopic data in the optical range of the Galactic ring nebulae NGC 6888, G2:4+1:4, RCW 58 and Sh2-308. Deep observations with long exposure times were carried out at the 6.5m Clay Telescope and at the 10.4m Gran Telescopio Canarias. In NGC 6888, recombination lines of C II, O II and N II are detected with signal-to-noise ratios higher than 8. The chemical content of NGC 6888 is discussed within the chemical enrichment predicted by evolution models of massive stars. For all nebulae, a forthcoming work will content in-depth details about observations, analysis and final results (Esteban et al. 2015, in prep.).
A. Mesa-Delgado, C. Esteban and J. Garcia-Rojas
Wed, 5 Aug 15
45/46
Comments: 3 pages, 2 figures. To appear on the proceedings of International Workshop on Wolf-Rayet stars, held in Postdam 1-5 June 2015. Eds. W.-R. Hamann, A. Sander, and H. Todt
You must be logged in to post a comment.