High-resolution spectroscopic observations of post-asymptotic giant branch candidates from the Edinburgh-Cape Survey

Astronomy and Astrophysics – Astronomy

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Stars: Abundances, Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Early-Type, Stars: Evolution, Galaxy: Halo

Scientific paper

High spectral resolution (R~ 40000) and signal-to-noise optical spectra, obtained at the Very Large Telescope (VLT), are presented for three post-asymptotic giant branch (AGB) candidates selected from the Edinburgh-Cape (EC) Faint Blue Object Survey. The stellar atmospheric parameters and chemical compositions, derived using sophisticated non-local thermodynamic equilibrium calculations, reveal that EC 14102-1337 and EC 20068-7324 are both in an evolved post-horizontal branch (HB) evolutionary state. However, EC 11507-2253 is most likely a post-AGB star.

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