...$^{\circ }$ 2522

Based on observations collected at the Observatoire de Haute Provence, France.

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... Rauw

Research Associate FNRS (Belgium).

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... type

Although we note that the equivalent widths of the He I$\lambda$ 4471 and He II$\lambda$ 4542 lines quoted by Doroshenko (1972) yield an O5.5 spectral type according to the classification criterion introduced lateron by Conti (1973).

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