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Fig. 2.


Comparison between two ESPaDOnS spectra of o Lupi, taken two months apart (shown in gray), and synthetic ATLAS9/COSSAM_SIMPLE spectra. The red line is the synthetic spectrum for a single star with Teff = 15 000 K, log g = 3.8 dex, and v sin i = 35 km s−1, and the blue line is the synthetic spectrum for a binary star with Teff, 1 = 17 000 K, Teff, 2 = 14 000 K, log g1 = 3.9 dex, log g2 = 3.8 dex, v sin i1 = 50 km s−1, v sin i2 = 25 km s−1, RV1 = −5 km s−1, RV2 = +5 km s−1, and a light fraction of 50%. Residuals to the fit are indicated with the same color coding and a small offset for increased visibility. Top row: observed spectrum E01; bottom row: E02 (see also Table A.2).

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