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

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Astrophysical Journal, Supplement Series; (USA)

DOI:https://doi.org/10.1086/191370· OSTI ID:7266019

Lorenzetti, D; Spinoglio, L; Massaro, E; Perola, G C ^[1]

---

1. CNR, Istituto di Fisica dello Spazio Interplanetario, Frascati (Italy) Roma I Universita, Rome (Italy)

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. 30 refs.

• OSTI ID: 7266019
• Journal Information: Astrophysical Journal, Supplement Series; (USA), Journal Name: Astrophysical Journal, Supplement Series; (USA) Vol. 71; ISSN APJSA; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BL LACERTAE OBJECTS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ERRORS
INFRARED RADIATION
MONITORING
NEAR INFRARED RADIATION
PHOTOMETRY
RADIATIONS
VARIATIONS