Recent advances in environmental controls outside the home setting

We obtained optical spectra of four objects identified with variable radio sources. Three objects (0029+0554, 0400+0550, 2245+0500) were found to be quasars with redshifts of 1.314, 0.761, and 1.091. One object (2349+0534) has a continuum spectrum characteristic of BL Lac objects. We analyze spectra of the radio sources in the range 0.97-21.7 GHz for the epoch 1997 and in the range 3.9-11.1 GHz for the epoch 1990, as well as the pattern of variability of their flux densities on time scales of 1.5 and 7 years.

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A. G. Gorshkov

Rapid variability of the radio flux density of 0524 + 034

Long-term variability of a complete sample of flat-spectrum radio sources at declinations of 4°–6° (B1950)

Variability of the flux densities of radio sources on timescales shorter than a month

Spectra, optical identifications, and statistics of a complete sample of radio sources at declinations 10°–12°30′

Optical spectra of four objects identified with variable radio sources

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