Statistics – Computation
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..105y&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 105-118.
Statistics
Computation
20
Astronomical Models, Galactic Evolution, Main Sequence Stars, White Dwarf Stars, Computational Astrophysics, Stellar Luminosity, Stellar Mass, Time Dependence
Scientific paper
Models of galactic evolution have been studied and their dependence on input parameters and functions like present day mass function (PDMF), IMF, star formation history (SFR(t)), time scales of stellar evolution, galactic disk age, and scale height diffusion investigated. Consistency requirements restrict the free choice e.g., of IMF, PDMF, and SFR. It is shown how PDMF-consistent calculations of white dwarf mass distributions and luminosity functions and comparison with observations lead to further constraints for acceptable models, but are at present not stringent enough to determine, e.g., the age of the galactic disk better than (10 +/- 4) Gyr. We also predict age distributions of white dwarfs as a function of luminosity and emphasize that is not allowed to assign to the white dwarf population a single scale height. The time evolution of birth rates for stellar remnants (white dwarfs, neutron stars and black holes), the number and mass density in the local column, as well as the mass given back to the interstellar medium is calculated for a set of acceptable models.
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