Issue |
Astron. Astrophys. Suppl. Ser.
Volume 133, Number 2, December I 1998
|
|
---|---|---|
Page(s) | 217 - 220 | |
DOI | https://doi.org/10.1051/aas:1998318 | |
Published online | 15 December 1998 |
Infrared variability of BL Lacertae
1
CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, China
2
Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, China
3
Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
Received:
24
November
1997
Accepted:
10
June
1998
In this paper, the historic light curves of BL Lacertae in the infrared
(JHK) bands have been constructed from the published literature. Maximum
variations of ,
, and
and average color indices of
,
, and
have been found. The relation
between the color index and the brightness of the source and the
correlation of color-color indices have been investigated. Our analysis
shows that there is no clear correlation between the color index and the
brightness, and the emission mechanism is non-thermal in the near-infrared.
Key words: infrared: galaxies / BL Lacertae objects: BL Lac
© European Southern Observatory (ESO), 1998