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Classical and Recurrent Nova Models

Published online by Cambridge University Press:  17 January 2013

Jordi José ,
Jordi Casanova ,
Enrique García–Berro ,
Margarita Hernanz ,
Steven N. Shore  and
Alan C. Calder
Jordi José
Affiliation:
Dept. Física i Enginyeria Nuclear, Univ. Politècnica de Catalunya, E-08036 Barcelona, & Institut d'Estudis Espacials de Catalunya, E-08034 Barcelona email: jordi.jose@upc.edu
Jordi Casanova
Affiliation:
Dept. Física i Enginyeria Nuclear, Univ. Politècnica de Catalunya, E-08036 Barcelona, & Institut d'Estudis Espacials de Catalunya, E-08034 Barcelona email: jordi.jose@upc.edu
Enrique García–Berro
Affiliation:
Dept. Física Aplicada, Univ. Politècnica de Catalunya, E-08860 Castelldefels(Barcelona) & Institut d'Estudis Espacials de Catalunya, E-08034 Barcelona email: garcia@fa.upc.edu
Margarita Hernanz
Affiliation:
Inst. Ciències de l'Espai (CSIC), Campus UAB, F. Ciències, E-08193 Bellaterra (Barcelona) & Institut d'Estudis Espacials de Catalunya, E-08034 Barcelona email: hernanz@ieec.uab.es
Steven N. Shore
Affiliation:
Dipt. Fisica ‘Enrico Fermi’, Univ. Pisa & Ist. Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa email: shore@df.unipi.it
Alan C. Calder
Affiliation:
Dept. Physics and Astronomy, Stony Brook Univ., Stony Brook, New York11794-3800 email: acalder@mail.astro.sunysb.edu
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Abstract

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Remarkable progress in the understanding of nova outbursts has been achieved through combined efforts in photometry, spectroscopy and numerical simulations. According to the thermonuclear runaway model, novae are powered by thermonuclear explosions in the hydrogen-rich envelopes transferred from a low-mass stellar companion onto a close white dwarf star. Extensive numerical simulations in 1-D have shown that the accreted envelopes attain peak temperatures ranging between 108 and 4 × 108 K, for about several hundred seconds, hence allowing extensive nuclear processing which eventually shows up in the form of nucleosynthetic fingerprints in the ejecta. Indeed, it has been claimed that novae can play a certain role in the enrichment of the interstellar medium through a number of intermediate-mass elements. This includes 17O, 15N, and 13C, systematically overproduced with respect to solar abundances, plus a lower contribution in a number of other species (A < 40), such as 7Li, 19F, or 26Al. At the turn of the XXI Century, classical novae have entered the era of multidimensional models, which provide a new insight into the physical mechanisms that drive mixing at the core-envelope interface.

In this review, we will present hydrodynamic models of classical novae, from the onset of accretion up to the explosion and ejection stages, both for classical and recurrent novae, with special emphasis on their gross observational properties and their associated nucleosynthesis. The impact of nuclear uncertainties on the final yields will be discussed. Recent results from 2-D models of mixing during classical nova outbursts will also be presented.

Keywords

accretionaccretion disks — convection — hydrodynamics — instabilities — nuclear reactionsnucleosynthesisabundances — stars: novaecataclysmic variableswhite dwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Issue S281: Binary Paths to Type Ia Supernovae Explosions , July 2011 , pp. 80 - 87
Copyright
Copyright © International Astronomical Union 2013

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