Abstract
A SURVEY of the optical variability of compact extragalactic objects has been in progress at Asiago Observatory since 1967. Observations are taken mainly with the 67/92/215 cm Schmidt telescope on Eastman 103a-O emulsion plus a 2-mm GG 13 filter to match the B-system. A full account of the data obtained so far is now in preparation and will be published elsewhere, but it is worthwhile to report immediately on the variability of the quasar 3C345 because of its remarkable characteristics. Since Kinman et al.1 discovered the large optical variations and the evidence of periodicities of 80 and 320 d, several papers have appeared reporting photometric observations of this object, whose behaviour is, therefore, unusually well covered. Also, 3C345 displays an apparent ‘super-light’ expansion at radio frequencies (see Cohen et al.2).
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References
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BARBIERI, C., ROMANO, G., DI SEREGO, S. et al. The optical variability of 3C345. Nature 268, 318–319 (1977). https://doi.org/10.1038/268318a0
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DOI: https://doi.org/10.1038/268318a0
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