Radio objects with a continuous optical spectrum. II - Four-color photoelectric photometry

Details Radio objects with a continuous optical spectrum. II - Four-color photoelectric photometry Radio objects with a continuous optical spectrum. II - Four-color photoelectric photometry

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..432b&link_type=abstract

(Astronomicheskii Zhurnal, vol. 62, May-June 1985, p. 432-449) Soviet Astronomy (ISSN 0038-5301), vol. 29, May-June 1985, p. 252

Astronomy and Astrophysics

Astronomy

10

Astronomical Photometry, Bl Lacertae Objects, Color-Magnitude Diagram, Colorimetry, Continuous Spectra, Radio Sources (Astronomy), Astronomical Models, Synchrotron Radiation, Ubv Spectra

Scientific paper

UBVR photometry is presented for 30 radio objects in the ROCOS class. The photometric observations were carried out at five locations in the USSR during the period 1979-1982. A total of 54 sets of UBV magnitudes was obtained as well as 26 R-band magnitudes. Analysis of the color measurements showed that: (1) in the two-color UBV and BVR diagrams, nearly all the rocos points fell within regions occupied by BL Lac objects, suggesting that the two classes are similar; (2) half of the rocos color measurements conformed to a pure power-law optical continuum F(nu) varies as nu exp. alpha, having an index alpha is equal to about -(1-2.5). In the remaining cases, the optical continua deviated from the power law. Some possible physical mechanisms for these deviations are discussed, including synchrotron radiation by relativistic-electron clumps traveling through quasi-regular magnetic fields. The U-B, B-V, V-R colors computed for power law continua (alpha greater than 2.5 but less than -6.5) are given in an appendix, as well as 24 sets of UBV measurement for the BL Lac object OJ 287.

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