Spectroscopic monitoring of classical and recurrent novae at Asiago Observatory

摘要

In the course of the monitoring of the spectral evolutions of classical and recurrent novae on the outbursts, 12 classical novae and 2 recurrent novae (U Sco, CI Aql) were observed at Padova Asiago Observatory in the years from 1990 to 2002. Here, I will mainly report of Nova Aql 1999-2 (V1494 Aql). This fast nova showed unexpected large variations of the intensity ratio of Hα/Hβ in the early decline phase and variable high velocity jets were observed more than 100 days after light maximum.