A study of metal abundance patterns in cool white dwarfs. II - Simulations of accretion episodes

Details A study of metal abundance patterns in cool white dwarfs. II - Simulations of accretion episodes A study of metal abundance patterns in cool white dwarfs. II - Simulations of accretion episodes

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...84...73d&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 84, no. 1, p. 73-89.

Statistics

Computation

62

Abundance, Cool Stars, Metallicity, Stellar Mass Accretion, White Dwarf Stars, Computational Astrophysics, Stellar Envelopes, Stellar Models

Scientific paper

Time-dependent calculations are presented for the episodic accretion of Mg, Si, Ca, and Fe onto cool white dwarfs, for the cases of H-rich and He-rich white dwarf models with a mass of 0.6 solar masses in the 25,000 to 5000 K T(eff) range. Metal distributions swiftly reach a steady state in the outer layers of the models. Accretion-rate estimates based on a simplified interstellar medium are used to develop a two-phase accretion model; within this framework, a detailed study is conducted of the atmospheric metal-to-dominant-species and metal-to-metal abundance ratios. The predictions of the two-phase accretion scenario are discussed in detail.

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