Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..101s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 101-105.
Astronomy and Astrophysics
Astrophysics
9
Bl Lacertae Objects, Gravitational Lenses, Variability, Charge Coupled Devices, Emission Spectra, Light Curve
Scientific paper
New CCD observations of the quasi-stellar BL Lacertae object AO 0235 + 164 show very large brightness variations on short timescales (up to about 0.7 magnitude per day) over a magnitude range from 15.7 to 18.9 together with significant color changes. Earlier observations have shown correlated outbursts in optical and radio wavelengths and the existence of a galaxy close to the line of sight to the BL Lac. It is appealing to explain the variation as due to microlensing, however brightness variations are then expected to be no more than 1 mag per week for a configuration as that in AO 0235 + 164, making this BL Lac a very unusual and interesting object in this respect. The emission line variability is however larger than expected from microlensing and is comparable to the continuum variation which is inconsistent with the micro-lens scenario but consistent with the expected emission line variability due to intrinsic variation. Whether the variation is due to microlensing or intrinsic, AO 0235 + 164 is a promising candidate for revealing information on the structure of active compact sources.
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