Issue |
Astron. Astrophys. Suppl. Ser.
Volume 133, Number 2, December I 1998
|
|
---|---|---|
Page(s) | 163 - 169 | |
DOI | https://doi.org/10.1051/aas:1998314 | |
Published online | 15 December 1998 |
The infrared and optical variability of OJ 287
1
CRAL Observatoire de Lyon, 9 avenue Charles André, 69563 Saint-Genis-Laval Cedex, France
2
Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, China
3
Joint Laboratory for Optical Astronomy, Chinese Academy of Sciences, China
4
Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
5
Department of Astronomy, Beijing Normal University, Beijing, China
Received:
19
March
1998
Accepted:
25
May
1998
In this paper, the long-term historical optical (UBVRI) and
near-infrared (JHK) data are presented with some new observations in the
optical (February 1994-January 1995) and near-infrared (November 1995)
bands included for BL Lac object OJ 287. The new optical data in V-band
are in agreement with the results reported by other authors (Sillanpaa
et al. 1996a; Arimoto et al. 1997), a close correlation between the color
index of and the magnitude V has been obtained from our new
observations. The new infrared observations presented here indicate that
the source was at a high level in the infrared band during the observation
period. From the available literature, we have got that the largest
variations for UBVRIJHK bands are respectively:
;
;
;
;
;
;
. A strong correlation is found between the optical and near-infrared
bands when the DCF method is used, which suggests that these two bands have the same emission mechanism.
Key words: BL Lacertae objects: individual: OJ 287; general / infrared: galaxies
© European Southern Observatory (ESO), 1998