VRI photometry of BL Lac (1997-1999) (Fan+, 2001)

Details VRI photometry of BL Lac (1997-1999) (Fan+, 2001) VRI photometry of BL Lac (1997-1999) (Fan+, 2001)

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ycat..33690758f&link_type=abstract

VizieR On-line Data Catalog: J/A+A/369/758. Originally published in: 2001A&A...369..758F

Astronomy and Astrophysics

Astronomy

Bl Lac Objects, Photometry: Vri

Scientific paper

We present the optical (V, R, and I) photometry for BL Lacertae, which was observed from 1997 through 1999, with the 1.56-m telescope at the Shanghai astronomical observatory (SHAO). After the 1997 outburst, it dimmed to a low state and then brightened again. During the period JD 2450701 to JD 2450701.5, variations of 0.40mag, 0.27mag, and 0.21mag over a time scale of 100min were found for V, R, and I bands, suggesting that the variations were decreasing with wavelength. The correlation between V, R, and I is also analyzed using the DCF (Discrete Correlation Function) method. This shows that the variability in the V, R, and I bands are correlated with no time delay longer than 0.2day. (1 data file).

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