Abundances from disentangled component spectra: the eclipsing binary V578 Mon
Department of Physics, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia e-mail: firstname.lastname@example.org
2 Royal Observatory of Belgium, Ringlaan 3, 1180 Brussel, Belgium
Accepted: 1 April 2005
Chemical abundances of the early–B type components of the binary V578 Mon are derived from disentangled component spectra. This is a pilot study showing that, even with moderately high line-broadening, metal abundances can be derived from disentangled spectra with a precision of 0.1 dex, differential to sharp-lined single stars of the same spectral type. This binary is well-suited to such an assessment because of its youth as a member of the Rosette Nebula cluster NGC 2244, strengthening the expectation of an unevolved ZAMS chemical composition. The method is useful for studying rotationally driven mixing in main-sequence stars, since fundamental stellar parameters are known with higher accuracy in (eclipsing) binaries. This paper also evaluates of the bias that might be present in disentangled spectra.
Key words: techniques: spectroscopic / stars: abundances / stars: binaries: spectroscopic / stars: individual: V578 Mon (HDE 259 135) / open clusters and associations: individual: NGC 2244
© ESO, 2005