A quasi-analytic study on ONeMg novae is performed to examine nucleosynthesis in wide range of white dwarf and envelope masses. Comparing our results with recent observations enables us to constrain those two parameters. About a half of observed ONeMg novae may have attained considerably high envelope masses such as ∼ 10-4 M⊙, then obtained high burning temperatures ∼ 3-4 × 108 K. Those may have produced significant amount of 22Na.
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