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http://hdl.handle.net/2248/4996
Title: | Surface compositions of R coronae borealis stars and extreme helium stars - some connections |
Authors: | Kameswara Rao, N |
Keywords: | Borealis Stars Helium Stars |
Issue Date: | Sep-2005 |
Publisher: | Astronomical Society of the Pacific |
Citation: | Thomas G. Barnes III and Frank N. Bash., eds., Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert, ASP Conference Series, Vol. 336, Proceedings of a symposium held 17 - 19 June, 2004 in Austin, Texas. pp. 185 - 198 |
Series/Report no.: | Astronomical Society of the Pacific Conference Series;Vol. 336 |
Abstract: | Abundances of R Coronae Borealis stars (RCBs) and Extreme Helium stars (EHes) are discussed. Recent estimates of the s-process elements in hot extreme helium stars show enhancements of lighter s-process elements (Y, Zr) relative to heavier s-process elements, a characteristic shared by RCB stars. It also suggests that at least some EHe stars went through an episode of s-process element synthesis in their earlier evolution. A majority of RCB stars show a high 12C/13C ratio in their atmospheres. A recent analysis of the spectrum of minority RCB star VCrA, however, shows a lower value between 4 - 10. The implications of these results are discussed. |
Description: | Open Access |
URI: | http://hdl.handle.net/2248/4996 |
ISBN: | 1-58381-201-6 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Surface Compositions of R Coronae Borealis Stars and Extreme Helium Stars | Open Access | 1.18 MB | Adobe PDF | ![]() View/Open |
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