On the possibility of systematizing classical novae by light curve type. II. Observational characteristics of novae and groups |
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| Authors: | A E Rosenbush |
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| Institution: | (1) Main Astronomical Observatory, National Academy of Sciences of the Ukraine, Kiev |
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| Abstract: | The separation of novae into groups, proposed in Part 1 of this paper, is discussed: it is based on the criterion of the shape
of the light curve, plotted on “outburst amplitude-logarithm of shell radius ” scales. The observational characteristics of
novae belonging to certain groups are considered. Novae of the GQ Mus group may be characterized by x ray emission. The proposed
separation of novae into groups may be related to the structure of the shell ejected in the outburst. Novae with smooth light
curves have ellipsoidal shells without pronounced nonuniformities. Novae with temporary fading or with brightness fluctuations
in the transitional stage of the outburst have ellipsoidal shells with a nonuniform distribution of matter (equatorial and
tropical belts in novae of the DQ Her group, an equatorial belt for the RR Pic group, and a patchy structure for the CP Pup
group). Relationships among certain parameters of novae are considered: absolute stellar magnitude, outburst amplitude, shell
expansion velocity, etc. From the “depth of temporary fading in the transitional stage of the outburst-shell expansion velocity”
dependence it can be concluded that the kinetic energy of the shell may be a constant for novae of the DQ Her group.
Translated from Astrofizika, Vol. 42, No. 2, pp. 189–202, April–June, 1999. |
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