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http://hdl.handle.net/2248/4572
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DC Field | Value | Language |
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dc.contributor.author | Mallik, D. C. V | - |
dc.date.accessioned | 2009-06-22T15:13:10Z | - |
dc.date.available | 2009-06-22T15:13:10Z | - |
dc.date.issued | 1978 | - |
dc.identifier.citation | Basinska-Grzesik-Grzesik, E and Mayor, M., eds., Chemical and dynamical evolution of our galaxy., Proceedings of the IAU Colloquium No.45 held at the Nicoclaus Copernicus University, Torun, Poland September 7 - 9 1977, pp. 187 - 191 | en |
dc.identifier.uri | http://hdl.handle.net/2248/4572 | - |
dc.description.abstract | The extent of nitrogen enrichment of the interstellar gas by planetary-nebula formation is evaluated, and the nitrogen and oxygen abundance gradients in the disk of the Galaxy are derived on the basis of a simple model for galactic evolution. The double-shell-source lifetime of stars of different initial mass is determined along with the maximum possible number of helium shell flashes for a star of particular mass. CNO production via the shell flashes is examined, the N-14 and O-16 yields for a generation of stars are computed, and the distributions of oxygen and nitrogen in the Galactic disk are obtained. It is found that primary production of N-14 in low-mass stars contributes nearly 50 percent to the total abundance of N-14 in the Galaxy, that the logarithmic abundance gradients in the solar neighborhood are -0.18 for nitrogen and -0.13 for oxygen, and that the gradients are sensitive to the distribution of interstellar gas. | en |
dc.language.iso | en | en |
dc.publisher | Geneva Observatory | en |
dc.relation.ispartofseries | IAU Colloquium; No.45 | - |
dc.relation.uri | http://adsabs.harvard.edu/abs/1978cdeo.coll..187M | en |
dc.subject | Abundance | en |
dc.subject | Galactic Evolution | en |
dc.subject | Nitrogen | en |
dc.subject | Planetary Nebulae | en |
dc.subject | Oxygen | en |
dc.subject | Stellar Envelopes | en |
dc.title | Planetary nebulae and nitrogen enrichment in the galaxy | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
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File | Description | Size | Format | |
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Planetary nebulae and nitrogen enrichment in the galaxy | 408.82 kB | Adobe PDF | ![]() View/Open |
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