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Astron. Astrophys. 328, 261-268 (1997)

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Spectroscopic analysis of the Alpha Centauri system * **

C. Neuforge-Verheecke *** and P. Magain ****

Institut d'Astrophysique de l'Université de Liège, 5, Avenue de Cointe, B-4000 Liège, Belgium

Received 21 May 1997 / Accepted 24 July 1997


A detailed spectroscopic analysis of the two components of the binary system [FORMULA] Centauri has been carried out on the basis of extensive high resolution and high signal-to-noise spectra. The temperatures of the stars have been determined from the Fe I excitation equilibrium and checked from the H [FORMULA] line wings. The abundances of 17 elements have been obtained and indicate a general overabundance of 0.24 dex relative to the Sun, with no significant difference between the two stars. All elements analysed, from CNO to the iron peak, show basically the same overabundance. Only nickel seems to be significantly more overabundant, while the neutron capture elements appear less enhanced.

Key words: stars: ff Centauri – stars: binaries: visual; abundances; fundamental parameters

* Based on observations carried out at the European Southern Observatory (La Silla, Chile)
** Table 4 is only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html
*** Chargé de Recherches at the belgian Fonds National de la Recherche Scientifique.
**** Maître de Recherches at the belgian Fonds National de la Recherche Scientifique.

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© European Southern Observatory (ESO) 1997

Online publication: March 24, 1998