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Historic Light Curve and Long‐Term Optical Variation of BL Lacertae 2200+420

J. H. FanCenter for Astrophysics, Guangzhou Normal University, Guangzhou 510400, China; and Joint Laboratory for Optical Astronomy, Chinese Academy of Sciences, ChinaG. Z. XieYunnan Observatory, Chinese Academy of Sciences, Kunming 650011, ChinaE. PecontalCentre de Recherche Astronomique de Lyon, Observatoire de Lyon, 9 Avenue Charles André, 69 563 Saint-Genis-Laval Cedex, FranceA. PecontalCentre de Recherche Astronomique de Lyon, Observatoire de Lyon, 9 Avenue Charles André, 69 563 Saint-Genis-Laval Cedex, FranceY. CopinCentre de Recherche Astronomique de Lyon, Observatoire de Lyon, 9 Avenue Charles André, 69 563 Saint-Genis-Laval Cedex, France

1998en

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Annotatsiya

In this paper, historical optical(UBVRI) data and newly observed data from the Yunnan Observatory of China(about100 years) are presented for BL Lacertae. Maximum variations in UBVRI: 5.12, 5.31, 4.73, 2.59, and 2.54 and color indices of U-B = -0.11 +/- 0.20, B-V= 1.0 +/- 0.11, V-R= 0.73 +/- 0.19, V-I= 1.42 +/- 0.25, R-I= 0.82 +/- 0.11, and B-I= 2.44 +/- 0.29 have been obtained from the literature; The Jurkevich method is used to investigate the existence of periods in the B band light curve, and a long-term period of 14 years is found. The 0.6 and 0.88 year periods reported by Webb et al.(1988) are confirmed. In addition, a close relation between B-I and B is found, suggesting that the spectra flattens when the source brightens.

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DOI: 10.1086/306301

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