Fig. 1
A representative spectrum of HD 233517 (K2III, upper spectrum) in comparison with the neighboring star HD 233520 (K0III, grey-line) and the M-K standard star α Ari (K2III, grey dotted line). The spectrum of HD 233517 is shifted by +0.4 in intensity for better visibility. The panels show, from top left to bottom right, Balmer Hα, Na i D lines, Li i 610.36, Li i 670.78, Ca ii 866.2 irt triplet line, 12CN and 13CN lines, C2 primary and secondary Swan lines, Balmer Hβ, and Balmer Hγ.
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