Bibcode
DOI
Takalo, L. O.; Kidger, M. R.; de Diego, Jose A.; Sillanpaa, Aimo; Nilsson, Kari
Bibliographical reference
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 40-52.
Advertised on:
7
1992
Citations
55
Refereed citations
55
Description
Results of a program of near-IR monitoring of a sample of blazars and
miniblazars observed during 1990 and 1991 with the Carlos Sanchez
Telescope, in Teide Observatory, Tenerife are presented. All of the
objects in the sample show blazar activity during the course of the
observations. Several of the objects in the sample have been monitored
for rapid variations on timescales of a few hours; only one of them has
not, to date, shown such activity. Markarian 421, Markarian 501, 3C273,
and AO 0235 + 164 show evidence of possible color variations, although
only in Markarian 501 and AO 0235 + 164 are these color changes beyond
doubt. One object, 3C345, unlike other blazars, shows a flatter spectrum
when fainter, confirming previously published results.