Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l..67m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, July 15, 1978, p. L67-L70. Research supported by Georgia State
Astronomy and Astrophysics
Astrophysics
26
Astronomical Photometry, Bl Lacertae Objects, Light Curve, Optical Polarization, Astronomical Models, Data Reduction, Extragalactic Radio Sources
Scientific paper
The new BL Lacertae object, 1418 + 54, has been found to exhibit large-amplitude optical variations on a time scale of days to years. The historical light curve of this object, as determined from a search of the archival plate collection of the Harvard College Observatory, indicates that it has a total range of at least about 4.8 mag. The long-term optical variability does not exhibit any obvious periodicity and implies source dimensions of approximately 0.0016 pc or less based on light-travel-time arguments. The variations observed are consistent with a multievent source model, similar to that proposed by Dent (1972) to account for the radio variability of extragalactic objects. However, the observed rate of change in brightness of 1418 + 54 is not consistent with the hypothesis that the individual events are due to Type II supernova explosions.
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