Optical Brightness Variations of Bl-Lacertae Objects

Details Optical Brightness Variations of Bl-Lacertae Objects Optical Brightness Variations of Bl-Lacertae Objects

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...103..342z&link_type=abstract

Astronomy and Astrophysics, Vol.103, P. 342, 1981

Astronomy and Astrophysics

Astrophysics

27

Scientific paper

Using the plate collection of the Bruce astrograph of the Landessternwarte Heidelberg-Königstuhl optical brightness variations between 1901 and 1980 have been measured for 21 BL Lac objects north of declination δ = -30°. The observed magnitude index R5B(max), [but not the maximum brightness variation ΔB (max)] is found to be positively correlated with the spectral index at 5 GHz.

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