1 National Astronomical Observatory, Japan 2 University of Tokyo, Japan 3 University of Chicago, USA A quasi-analytic study on ONeMg novae is performed in wide range of white dwarf and envelope masses to constrain those two parameters.
Some observations also show that the novae enhanced with sulfur deplete oxygen in their ejecta.
They may have achieved rather high temperatures during outbursts, which require massive white dwarfs or ignition envelopes. There is, however, a serious disagreement on envelope masses between observations and current theory. We examine the range of white dwarf and envelope masses by comparison of the nucleosynthetic results with observational abundance estimates.