Abstract
HOSKINS et al.1 have identified the Parkes radio source 0048-097 with a neutral stellar object of 17 mag, and Carswell et al.2 have shown that, in common with the BL Lacertae class of quasistellar object (BL Lacertids) it has a featureless optical spectrum, that it is a rapid radio variable at high frequencies3–6 and that it has a radio spectrum similar to BL Lacertae3. (The name ‘Lacertid’ has been suggested7 for this class, but this invites confusion with meteor showers.) To complete the identification of PKS0048-097, we have investigated two further characteristics of the BL Lacertids: the rapidity of the optical variability; and the total range of optical variability and its correlation with the decimetric spectral index8.
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References
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USHER, P., KOLPANEN, D. & POLLOCK, J. Optical variability of PKS0048-097. Nature 252, 365 (1974). https://doi.org/10.1038/252365a0
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DOI: https://doi.org/10.1038/252365a0
