dc.contributor.author |
Giridhar, S |
|
dc.contributor.author |
Lambert, D. L |
|
dc.contributor.author |
Gonzalez, G |
|
dc.date.accessioned |
2008-08-12T09:34:02Z |
|
dc.date.available |
2008-08-12T09:34:02Z |
|
dc.date.issued |
2000-12 |
|
dc.identifier.citation |
The Publications of the Astronomical Society of the Pacific, Vol. 112,No. 778, pp. 1559 - 1566 |
en |
dc.identifier.issn |
0004-6280 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/3097 |
|
dc.description.abstract |
Chemical compositions are derived from high-resolution spectra for five field SRd variables. These supergiants not previously analyzed are shown to be metal poor: KK Aql with [Fe/H]=-1.2, AG Aur with [Fe/H]=-1.8, Z Aur with [Fe/H]=-1.4, W LMi with [Fe/H]=-1.1, and WW Tau with [Fe/H]=-1.1. Their compositions are, except for two anomalies, identical to within the measurement errors to the compositions of subdwarfs, subgiants, and less evolved giants of the same [Fe/H]. One anomaly is an s-process enrichment for KK Aql, the first such enrichment reported for an SRd variable. The second and more remarkable anomaly is a strong lithium enrichment for W LMi, also a first for field SRd variables. The Li I λ6707 profile is not simply that of a photospheric line but includes strong absorption from redshifted gas, suggesting, perhaps, that lithium enrichment results from accretion of Li-rich gas. This potential clue to lithium enrichment is discussed in light of various proposals for lithium synthesis in evolved stars. |
en |
dc.format.extent |
173288 bytes |
|
dc.format.mimetype |
application/pdf |
|
dc.language.iso |
en |
en |
dc.publisher |
The Astronomical Society of the Pacific |
en |
dc.relation.uri |
http://www.journals.uchicago.edu/doi/abs/10.1086/317721 |
en |
dc.subject |
Stars: Abundances |
en |
dc.subject |
Stars: Variables: Other |
en |
dc.subject |
Stars: AGB and Post-AGB |
en |
dc.title |
The Chemical Compositions of the SRD Variable Stars. III. KK Aquilae, AG Aurigae, Z Aurigae, W Leo Minoris, and WW Tauri |
en |
dc.type |
Article |
en |