Short time scale variability of the BL Lacertae object OJ 287 in the near-infrared

Details Short time scale variability of the BL Lacertae object OJ 287 in the near-infrared Short time scale variability of the BL Lacertae object OJ 287 in the near-infrared

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...71..175l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 71, Oct. 1989, p. 175-181. Research supported by MPI and CNR.

Astronomy and Astrophysics

Astrophysics

13

Bl Lacertae Objects, Extragalactic Radio Sources, Infrared Photometry, Near Infrared Radiation, Astronomical Photometry, Root-Mean-Square Errors, Temporal Distribution

Scientific paper

The results of a NIR photometric monitoring of the BL Lac object OJ 287 are presented. The standard JHK photometry shows variability of maximum amplitude of about 0.7 mag over the entire observing period of 23 months and about 0.3 mag on time intervals as short as about 3 hr. No spectral variability has been found. A fast monitoring performed in the H band, with a sampling period of about 4 min, provides evidence that variations can occur in this object on time scales of over 4 min and with an rms amplitude of 6-7 percent. These variations show slow increasing and fast decreasing trends, but no clear indication of periodicity is apparent.

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