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

Authors :: D. Kilkenny
Nigel Hambly
D. O'Donoghue
Jonathan Smoker
W. R. J. Rolleston
H.T. McGillivray
B.B. Lynn
Robert Ryans
Philip Dufton
Francis P. Keenan
Source :: Monthly Notices of the Royal Astronomical Society. 363:911-917
Publication Year :: 2005
Publisher :: Oxford University Press (OUP), 2005.
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.

Subjects :: Physics
Very Large Telescope
Thermodynamic equilibrium
High resolution
Astronomy
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Optical spectra
Galactic halo
Space and Planetary Science
Astrophysics::Solar and Stellar Astrophysics
Asymptotic giant branch
Astrophysics::Earth and Planetary Astrophysics
Spectral resolution
Stellar evolution
Astrophysics::Galaxy Astrophysics

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