Abstract
MULTICOLOUR photometric observations have been made of Nova Cygni 1975. A periodic variation of ∼3.2 h was detected by Tempesti1 on 1975 September 14 when the nova was at mv = 6. On 1975 September 18 we made a 4-h survey in five colours, UBVRI, to check this variation using the 40-cm telescope of the Laboratorio di Astrofisica Spaziale CNR at Frascati, in the Monte Porzio Observatory. The variation was confirmed for all colours, and other significant characteristics of the light curve have been detected.
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References
Tempesti, P., IAU Circ. Nos 2834 and 2842 (1975).
Gianni, G., Mazzitelli, I., and Natali, G., Astr. Astrophys. (in the press).
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MARCOCCI, M., MESSI, R., NATALI, G. et al. UBVRI photometry of Nova Cygni 1975. Nature 259, 186–187 (1976). https://doi.org/10.1038/259186a0
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DOI: https://doi.org/10.1038/259186a0
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