dc.contributor.author |
Kameswara Rao, N |
|
dc.date.accessioned |
2010-01-21T14:35:02Z |
|
dc.date.available |
2010-01-21T14:35:02Z |
|
dc.date.issued |
2005-09 |
|
dc.identifier.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 |
en |
dc.identifier.isbn |
1-58381-201-6 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/4996 |
|
dc.description |
Open Access |
|
dc.description.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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
Astronomical Society of the Pacific |
en |
dc.relation.ispartofseries |
Astronomical Society of the Pacific Conference Series;Vol. 336 |
|
dc.relation.uri |
http://aspbooks.org/custom/publications/paper/336-0185.html |
en |
dc.rights |
© Astronomical Society of the Pacific |
en |
dc.subject |
Borealis Stars |
en |
dc.subject |
Helium Stars |
en |
dc.title |
Surface compositions of R coronae borealis stars and extreme helium stars - some connections |
en |
dc.type |
Article |
en |