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astro-ph2004
Evolution of planetary nebulae II. Population effects on the bright cut-off of the PNLF
P. Marigo, L. Girardi, A. Weiss +2
We investigate the bright cut-off of the [OIII]l5007 planetary nebula luminosity function (PNLF), that has been suggested as a powerful extragalactic distance indicator. Theoretica…
astro-ph2003
Optical variability of the BL Lacertae object GC 0109+224. Multiband behaviour and time scales from a 7-years monitoring campaign
S. Ciprini, G. Tosti, C. M. Raiteri +4
We present the most continuous data base of optical observations ever published on the BL Lacertae object GC 0109+224, collected mainly by the robotic telescope of t…