Evolutionary population synthesis in stellar systems. I - A global approach

Details Evolutionary population synthesis in stellar systems. I - A global approach Evolutionary population synthesis in stellar systems. I - A global approach

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...71..817b&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 71, Dec. 1989, p. 817-869. Research supported by CNR and MPI.

Statistics

Computation

213

Late Stars, Stellar Evolution, Stellar Models, Stellar Spectrophotometry, Stellar Systems, Asymptotic Giant Branch Stars, Horizontal Branch Stars, Red Giant Stars, Stellar Magnitude, Stellar Structure

Scientific paper

A new grid of 450 theoretical models for old simple stellar populations is presented. Evolutionary synthesis explores the influence of relevant parameters such as age, chemical composition, initial mass function, and stellar mass loss, on the integrated spectral energy distribution. Ages range between 4 and 18 Gyr, and the metallicity Z ranges from 0.0001 to 0.03, with helium content Y = 0.23 and 0.25, respectively. Three values are considered for the initial mass function, assumed as a power law, N(M) proportional to M exp-s; s = 1.35, 2.35, and 3.35. The computational code takes into account in a quantitative way the contributions from all the relevant stellar evolutionary phases according to the theory of the stellar evolution. Thus, late stage in the life of low- mass stars, such as the horizontal branch and the asymptotic and postasymptotic giant branches are accounted for. Furthermore, a simplified treatment for the evolution of the horizontal branch is developed, and the influence of different morphologies are investigated.

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