Mixing fraction in classical novae

Context. Classical novae are powered by thermonuclear runaways occurring on the surface of accreting white dwarfs (WDs). In observations, enrichments heavy elements in nova ejecta have been detected, indicating a mixing process between accreted matter and from outer layers underlying WDs prior to outbursts. However, fraction classical is still uncertain. Aims. The purpose this article investigate some elemental abundance ratios during outbursts that can be used estimate WD novae. Methods. By considering different fractions with stellar evolution code Modules for Experiments Stellar Astrophysics, we carried out series simulations outbursts, which initial CO masses range 0.7−1.0 M ⊙ . Results. We identified four (i.e. (H + He)/∑CNO, He)/Ne, ∑CNO/Mg, ∑CNO/Si) satisfy conditions determining fraction, He)/∑CNO most suitable meter. also estimated representative Additionally, found higher metallicity fraction) preferentially accompanied longer t 2 (the time decline two magnitudes peak luminosity) Our results constrain