BV RI photometry of BL Lacertae in 1993-1995

被引：22

作者：

Maesano, M ^{[1
]}

Montagni, F ^{[1
]}

Massaro, E ^{[1
]}

Nesci, R ^{[1
]}

机构：

[1] UNIV ROMA LA SAPIENZA,IST ASTRON,I-00161 ROME,ITALY

来源：

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 1997年 / 122卷 / 02期

关键词：

BL Lacertae objects; general; BL Lacertae; individual; BL Lac;

D O I：

10.1051/aas:1997101

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The results of optical photometry of BL Lac over a time interval of two years in the B, V, R, I filters are presented. The source is found for most of the time in a low state. The mean colour indexes are similar to those observed in higher luminosity states, however a flattening of the spectral slope was present during three small amplitude outbursts. A brief comparison with the observations available in the literature and some considerations on the physical conditions driving the appearance of emission lines are made.

引用

页码：267 / 270

页数：4

共 20 条

[1] MULTIFREQUENCY OBSERVATIONS OF BLAZARS .3. THE SPECTRAL SHAPE OF THE RADIO TO X-RAY CONTINUUM [J].