High-resolution spectroscopic observations of post-asymptotic giant branch candidates from the Edinburgh–Cape Survey |
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| Authors: | B. B. Lynn F. P. Keenan P. L. Dufton W. R. J. Rolleston J. V. Smoker R. S. I. Ryans D. Kilkenny D. O'Donoghue N. Hambly H. T. McGillivray |
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| Affiliation: | Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN;South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape, South Africa;European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile;Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ |
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| Abstract: | High spectral resolution ( R ∼ 40 000) 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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| Keywords: | stars: abundances stars: AGB and post-AGB stars: atmospheres stars: early-type stars: evolution Galaxy: halo |
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