dc.contributor.author |
Arellano Ferro, A |
|
dc.contributor.author |
Giridhar, S |
|
dc.contributor.author |
Mathias, P |
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dc.date.accessioned |
2008-07-31T05:03:26Z |
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dc.date.available |
2008-07-31T05:03:26Z |
|
dc.date.issued |
2001-03 |
|
dc.identifier.citation |
Astronomy and Astrophysics, Vol. 368, No. 1, pp. 250 - 266 |
en |
dc.identifier.issn |
0004-6361 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/2950 |
|
dc.description.abstract |
Detailed atmospheric abundances have been calculated for a sample of -G supergiant stars with IR fluxes and/or high galactic latitudes. HD 172481 and HD 158616 show clear indications of being post-AGB stars that have experienced third dredge-up. HD 158616 is carbon-rich while the abundance pattern of HD 172481 and its large Li enhancement gives support to the hot bottom burning scenario that explains paucity of carbon-rich stars among AGB stars. HD 172324 is very likely a hot post-AGB star that shows a strong carbon deficiency. HD 725, HD 218753 and HD 331319 also appear to be evolved objects between the red giant and the AGB. HD 9167, HD 173638 with a few exceptions, reflect solar abundances and no signs of post red giant evolution. They are most likely young massive disk supergiants. Further analysis of proto-Planetary Nebula HDE 341617 reveals that He lines show signs of velocity stratification. The emission lines have weakened considerably since 1993. The envelope expands at 19 km s-1 relative to the star. Atmospheric abundances, evolutionary tracks and isochrones are used to estimate masses and ages of all stars in the sample. Based on observations obtained at the Haute-Provence Observatory, France. Tables 11 and 12 are only available in electronic form at http://www.edpsciences.org |
en |
dc.format.extent |
301259 bytes |
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dc.format.mimetype |
application/pdf |
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dc.language.iso |
en |
en |
dc.publisher |
EDP Sciences |
en |
dc.relation.uri |
http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2001/10/aa10212/aa10212.html |
en |
dc.subject |
Stars: Post-AGB |
en |
dc.subject |
Stars: Chemically Peculiar |
en |
dc.subject |
Stars: Evolution |
en |
dc.title |
Atmospheric abundances in post-AGB candidates of intermediate temperature |
en |
dc.type |
Article |
en |