Optical observations of BL Lacertae from 1997 to 1999
Optical observations of BL Lacertae from 1997 to 1999
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DOI：
10.1051/0004-6361:20010169
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发表时间：
2001-03
影响因子：
6.5
通讯作者：
J.H.Fan;B. Qian;J. Tao
中科院分区：
文献类型：
--
作者：
J.H.Fan;B. Qian;J. Tao
我们展示了从 1997 年到 1999 年使用上海天文台 (SHAO) 的 1.56 米望远镜观测到的 BL 蜥蜴的光学（V、R、和 ndI）光度。 1997年爆发后，它变暗至较低状态，然后再次变亮。在JD 2450701至JD 2450701.5期间，在100分钟的时间尺度内发现V、R、ndI波段的变化为0.40 mag、0.27 mag和0.21 mag，这表明变化随着波长而减小。还使用DCF（离散相关函数）方法分析V、R、ndI之间的相关性。这表明 V、R 和 I 带的变异性与不超过 0.2 天的时间延迟相关。
We present the optical (V , R ,a ndI) 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 0.40 mag, 0.27 mag, and 0.21 mag over a time scale of 100 min were found for V , R ,a ndI bands, suggesting that the variations were decreasing with wavelength. The correlation between V , R ,a ndI 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 0.2 day.