[vsnet-chat 591] photometry of Novae at the beginning of dust condensation phase

[munari@astras.pd.astro.it (Ulisse Munari)]

some novae when 3.0/3.5 mag fainter than at maximum experience a phase
of dust condensation. Dust grains begin to form in the expanding ejecta
and grow in dimension. When growing is completed the grain are generally
too large for selective absorption (i.e. they absorb equally in U, B and V),
but during the growth the grains pass through sizes that should produce
a large reddening. This short phase duration (in Nova Aql 1993 we found it
to last few days) is of great interest to study dust formation and grain 
evolution, and fast reaction by people having access to multicolor 
photometry as soon as a dust phase condensation alert goes out is a key to
successful observations.

ulisse munari

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp