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Signatures of unresolved binaries in stellar spectra: implications for spectral fitting

El-Badry, Kareem; Rix, Hans-Walter; Ting, Yuan; Weisz, Daniel R; Bergemann, Maria; Cargile, Phillip; Conroy, Charlie; Eilers, Anna-Christina


The observable spectrum of an unresolved binary star system is a superposition of two single-star spectra. Even without a detectable velocity offset between the two stellar components, the combined spectrum of a binary system is in general different from that of either component, and fitting it with single-star models may yield inaccurate stellar parameters and abundances. We perform simple experiments with synthetic spectra to investigate the effect of unresolved main-sequence binaries on...[Show more]

CollectionsANU Research Publications
Date published: 2018
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stx2758
Access Rights: Open Access


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