2026RNAAS..10...51S

A large sample of t₂ and t₃ times from the recent compilation of nova properties given in B. E. Schaefer have been analyzed to determine relationships between these two parameters. Fits were performed in both directions (from ${\mathrm{log}}\,{t}_{2}$ to ${\mathrm{log}}\,{t}_{3}$ and vice-versa) to account for the asymmetry inherent in ordinary least-squares regression, which minimizes residuals only in the dependent variable. The following best-fit relations were found: ${\mathrm{log}}\,{t}_{3}=(0.877\pm 0.019){\mathrm{log}}\,{t}_{2}+(0.444\pm 0.027)$, and ${\mathrm{log}}\,{t}_{2}=(1.018\pm 0.023){\mathrm{log}}\,{t}_{3}-(0.316\pm 0.037)$, corresponding to ${t}_{3}=(2.78\pm 0.17)\,{t}_{2}^{(0.877\pm 0.019)}$ and ${t}_{2}=(0.483\pm 0.041)\,{t}_{3}^{(1.018\pm 0.023)}$, respectively. Within the uncertainties, the latter relation reduces to a simple proportionality: t₂ ≃ 0.5 t₃.