A classical (recurrent) nova explosion occurs on the surface of an
accreting white dwarf with a companion star
in a close binary system. Due to recent developments in both observation
and theory, nova research is becoming
more quantitative and statistical. However, there still remain unsolved
questions to be answered in follow-up
studies. In our seminar talk, we will focus on the key issues and present
our results, covering V1280 Sco
(an extremely slow nova), V339 Del (the first 7Be detected nova) and M31N
2008-12a (a remarkable recurrent
nova in M31).
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