Browsing by Subject "Cosmic abundances."
Now showing items 1-4 of 4
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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, ... -
Abundances in planetary nebulae: An autopsy of low and intermediate mass stars.
(1997)In this work we report on the results of synthetic thermally pulsing asymptotic giant branch models (TP-AGB) and compare the results to the abundance ratios in a sample of planetary nebulae. We use updated the input ... -
Heavenly metal: A study of neutron-capture element abundances in metal-poor galactic halo stars.
(1998)New abundances for neutron-capture elements in a large sample of metal-poor giants from the Bond survey in addition to 3 well known individual cases, are presented. The spectra for the Bond Giants were acquired with the ... -
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, ...