2 papers
astro-ph2000
Was the Whirlpool (M51) a Spiral Galaxy before the Encounter with the Companion NGC 5195?
F. Natali, L. Di Fino, G. Natali
Using the B-I color index in the radial photometry of M51, applied to defined azimuthal sectors, we reveals asymmetries in the shape of the density pattern of the galactic arms. Th…
astro-ph1998
BVI Microvariability in BL LAC during the summer 1997 outburst
R. Speziali, G. Natali
BL Lac has been observed during the outburst occurred in the 1997 summer (Noble et al. 1997; Bloom et al. 1997) in three optical bands (BVI), with the aim of studying the intranigh…