Search for short variability time-scales of BL Lacertae objects

Details Search for short variability time-scales of BL Lacertae objects Search for short variability time-scales of BL Lacertae objects

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..329x&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 329-339. Research supported by the National Natural

Physics

Optics

43

Astronomical Photometry, Bl Lacertae Objects, Charge Coupled Devices, Image Processing, Light Curve, Cassegrain Optics, Relativistic Theory, Stellar Magnitude, Time Dependence

Scientific paper

CCD image photometry data for 12 BL Lac objects have been obtained during 17 months. Light curves and photometric data are presented and discussed. The results suggest that a large-amplitude variation (Delta m = 0.45 mag or greater) on a short time scale (from a few hundred seconds to several hours) is a relatively rare phenomenon. Five of 12 BL Lac objects are variable on these time scales. Evidence for relativistic beaming in 5 BL Lac objects is discussed.

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