CNO abundances and hydrodynamic studies of the Nova outburst. V. 1. 00 M/sub sun/ models with small mass envelopes
We report on an investigation into the consequences of thermonuclear runaways in 10/sup -4/ M/sub sun/ accreted hydrogen envelopes on 1.00 M/sub sun/ white dwarfs. These evolutionary sequences predict that from 10/sup -5/ M/sub sun/ to 5 x 10/sup -5/ M/sub sun/ will be ejected with speeds from 300 to 3800 km s/sup -1/ (kinetic energies of 10/sup 44/-10/sup 45/ ergs). Absolute visual magnitudes as high as -8.1 mag are attained, well within the observed range for fast novae. In addition, the shapes of the theoretical light curves are more reminiscent of an observed fast nova light curve than those in our earlier studies.The ejected material is stongly enhanced in the products of incomplete CNO burning: the most abundant of the ejected nuclei is /sup 1/3C, followed by /sup 14/N and /sup 12/C. The differences from previous studies are attributable to the lower peak temperatures reached in these sequences. These models also produce a large (approx.200) overabundance of /sup 7/Li, suggesting that novae may represent significant contributors to the galactic enrichment of this nucleus.We discuss the effects of circumbinary material on the light curve. We suggest that the presence of this gas, the remnant of nonconservative mass transfer, can strongly affect the shape of the light curve around maximum visual magnitude in an actual nova outburst.We find, as in our earlier work, that these models do not eject their entire accreted envelopes in the earliest stages of the outburst. The residual envelopes quickly evolve to configurations which are hot and bright, representing the probable source for the UV radiation observed in all recent classical novae.
- Research Organization:
- Theoretical Division, University of Califronia Los Alamos Scientific Laboratory
- OSTI ID:
- 6775172
- Journal Information:
- Astrophys. J.; (United States), Vol. 226:1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Recurrent novae as a consequence of the accretion of solar material onto a 1. 38 M/sub sun/ white dwarf
CNO abundances and the strengths of nova outbursts and hydrogen flashes on accreting white dwarfs
Related Subjects
GENERAL PHYSICS
NOVAE
STAR MODELS
WHITE DWARF STARS
CHEMICAL COMPOSITION
STAR EVOLUTION
ABUNDANCE
CNO CYCLE
HYDRODYNAMICS
ISOTOPES
NUCLEOSYNTHESIS
SHOCK WAVES
STAR ACCRETION
THERMONUCLEAR REACTIONS
DWARF STARS
ERUPTIVE VARIABLE STARS
FLUID MECHANICS
MATHEMATICAL MODELS
MECHANICS
NUCLEAR REACTIONS
STAR BURNING
STARS
VARIABLE STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources