Grain Formation in Nova Envelopes

概要

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Grain formation in ejected envelopes of novae is investigated. The solar abundance is assumed as one of the typical examples that C/O is smaller than unity. The magnesium silicate is proved to be the first main condensate. We estimate the monomer concentration c_1(t_1) at the onset of condensation to be about 10^5cm^<-3> for ΔM=3×10^<-4>M_<⦿< and V_<exp>=1000km sec^<-1>. (ΔM is the ejected mass and V_<exp> is the expansion velocity.) Then we calculate the time variation of the concentrations of magnesium-silicate grains on the basis of the nonsteady nucleation theory. The size distributions are found to be flat- or diffuse and have no conspicuous peak. The boundary whether grains are formed or not is determined mainly by the amount of the ejected mass. The lower limit of the ejected mass for the grain formation is about 10^<-4>M_<⦿>. The maximum radius of grains is estimated to be about 50Å for c_1(t_1)=5×10^5cm^<-3>.
理論物理学刊行会の論文
1977-06-25