Search
Now showing items 1-2 of 2
The abundance and chemical evolution of nitrogen in spiral galaxies.
(1998)
The character of nitrogen processing in spiral galaxies is studied in this dissertation. Of particular interest are questions of how the (N/O) ratio changes over time as a result of perturbations of environmental parameters, ...
Prospecting for elements: Galactic halo planetary nebulae abundances and Virgo spiral galaxy color profiles.
(1998)
Near-infrared Virgo cluster spiral colors. Near-infrared (NIR) surface photometry in J (1.2$\mu$m), H (1.6$\mu$m) and K (2.2$\mu$m) have been obtained for a sample of Virgo cluster spirals; NGC4321, NGC4303, NGC4571, ...