2002
DOI: 10.1046/j.1365-8711.2002.05912.x
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High-resolution Keck I spectroscopy of Galactic halo post-asymptotic giant branch stars

Abstract: Absolute and differential abundance analyses have been performed from high‐resolution, high signal‐to‐noise ratio optical (Keck I) spectra for three evolved Galactic halo stars, namely PG 1704 + 222, HD 341617 and LS IV −04 01. Their derived atmospheric parameters indicate that all three objects are undergoing a post‐asymptotic giant branch (post‐AGB) phase of evolution. A differential abundance analysis reveals HD 341617 as having a mild carbon deficiency of 0.74 dex, possibly due to the star having evolved o… Show more

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Cited by 19 publications
(28 citation statements)
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“…References: 1. Mooney et al (2002) Schönberner (1990). A high remnant mass would seem consistent with the rate of spectral evolution, with the 0.836 M⊙ model evolving from A5 to B1 in ∼ 50 yr.…”
Section: Iras 18062+2410supporting
confidence: 54%
“…References: 1. Mooney et al (2002) Schönberner (1990). A high remnant mass would seem consistent with the rate of spectral evolution, with the 0.836 M⊙ model evolving from A5 to B1 in ∼ 50 yr.…”
Section: Iras 18062+2410supporting
confidence: 54%
“…For the early-type stars the stellar features were normally broad (cf. Mooney et al 2002Mooney et al , 2004 and hence easily removed in the normalisation process. Finally, Cols.…”
Section: Flames-giraffe Archive Sample Towards Open Clusters In the Mmentioning
confidence: 99%
“…Several hot post-AGB stars have also been identified in the high galactic latitudes and the halo of our Galaxy on the basis of their derived atmospheric parameters and chemical composition (Conlon et al 1991, 1994, McCausland et al 1992, Mooney et al 2002. (These stars appear to be hotter analogues of A and F -type post-AGB stars).…”
Section: Hot Post-agb Starsmentioning
confidence: 99%
“…Stars belonging to this group are HR 4049, HD 52961, and HD 44179 (Van Winckel et al 1992, Van Winckel 2003, Takeda et al 2002, (3) F-type post-AGB supergiants are carbon-rich and overabundant in s-process elements indicating that they have gone through the third dredge-up during their AGB stage of evolution. IRAS 05341+0852 is a good example of such a post-AGB star , and (4) The high galactic latitude low gravity hot post-AGB supergiants show underabundances of Fe and significant underabundances of carbon indicating that these are old disc or halo stars in the post-AGB stage of evolution (McCausland et al 1992, Parthasarathy et al 2000b, Mooney et al 2002. Further studies are needed to understand how the AGB and post-AGB evolution of low and intermediate mass stars result in the above mentioned post-AGB abundance patterns.…”
Section: Hot Post-agb Starsmentioning
confidence: 99%
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