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DC Field | Value | Language |
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dc.contributor.author | Parthasarathy, M | - |
dc.date.accessioned | 2008-07-22T11:36:27Z | - |
dc.date.available | 2008-07-22T11:36:27Z | - |
dc.date.issued | 1999 | - |
dc.identifier.citation | IAU Symposia, Vol. 191, pp. 475 - 480 | en |
dc.identifier.issn | 0074-1809 | - |
dc.identifier.uri | http://hdl.handle.net/2248/2815 | - |
dc.description.abstract | On the basis of C/O ratios the evolutionary connection between C-rich AGB/post-AGB stars and C-rich central stars of PNe is discussed. The proportion of carbon-rich post-AGB stars is comparable to that of carbon-rich PNe. The post-AGB stars with 21 micron emission are found to be over abundant in carbon and s-process elements indicating that they have gone through the third dredge-up and carbon star phase on the AGB. As these stars evolve to higher temperature they will form carbon-rich PNe with carbon-rich central stars. Analysis of C/O ratios of PNe suggests that 68 percent of PNe have C/O > 1 indicating that the progenitors have gone through the third dredge-up and carbon-rich phase on the AGB. The Type I PNe can be divided into two groups. Group I Type I PNe are those with C/O < 1 indicating that their massive progenitors have gone through the third dredge-up and hot bottom burning on the AGB. Group II Type I PNe are those with C/O > 1. Their progenitors have gone through third dredge-up only and may not have experienced hot bottom burning. Carbon stars with silicate dust and or carbon-rich post-AGB stars (such as post-AGB stars with 21 micron emission) may be the progenitors of PNe with [WC] central stars. The evolutionary sequence seems to be: carbon-rich AGB --> carbon-rich post-AGB --> [WC late type] --> [WC early type] --> [WC-PG 1159] --> PG 1159. | en |
dc.format.extent | 664059 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | en | en |
dc.publisher | International Astronomical Union | en |
dc.relation.uri | http://adsabs.harvard.edu/abs/1999IAUS..191..475P | en |
dc.subject | Post-Agb Stars | en |
dc.subject | Red Giant Stars | en |
dc.subject | Planetary Nebulae | en |
dc.subject | Carban- rich PNe | en |
dc.title | Evolutionary connection between C-rich AGB stars and C-rich central stars of PNe | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
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Parthasarathy M.pdf | 648.5 kB | Adobe PDF | ![]() View/Open |
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