This article has an erratum: [https://doi.org/10.1051/0004-6361/201117721e]
V705 Cas (Ritter Observatory spectra of the optically thick stage of the CO nova Nova Cas 1993, Na I D line variations. Top: 1993 Dec. 27. Middle: 1993 Dec. 29, 1994. Bottom: 1994 Jan. 5 (see text for details)
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