2568 20160701171707.0 ASTROimport-725 Hajduk, M. 2008 Studying the Old Planetary Nebula of V4334 Sgr We study the old planetary nebula around V4334 Sgr using narrow band optical imaging and spectroscopy in the [O III] 5007 Å emission line and radio observations. The obtained model of the nebula yields an age of 8300 yrs, pre-outburst luminosity of log(L/L?)=2.08 and temperature log(T/K)=4.94. A decrease of the flux by a factor of ?1.5 at 4.8 GHz during the last 11 years cannot be excluded, although this is in contradiction with optical observations. Gesicki, K. van Hoof, P. A. M. Lopez, J. A. Zijlstra, A. A. Hydrogen-Deficient Stars 391 2008 163 http://esoads.eso.org/abs/2008ASPC..391..163H published in NONREF