New photographic observations of BL Lacertae

Details New photographic observations of BL Lacertae New photographic observations of BL Lacertae

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....41..423v&link_type=abstract

Astronomy and Astrophysics, vol. 41, no. 3-4, July 1975, p. 423-430.

Astronomy and Astrophysics

Astrophysics

10

Astronomical Photography, Astronomical Photometry, Luminous Intensity, Variable Stars, Data Reduction, Error Analysis, Galactic Radiation, Relativistic Effects, Root-Mean-Square Errors, Size Determination, Tables (Data)

Scientific paper

Results are presented for photographic observations of BL Lac which were made over a 16-month period to obtain a more precise determination of the object's variability. Variations of one magnitude per day and 0.25 magnitude in three hours were observed. Previously reported variations with a time scale of one day or less are reviewed. It is concluded that variations of two magnitudes per day are well established. This corresponds to a maximum linear diameter of seven light-days, at least in the absence of highly relativistic effects.

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