The age-metallicity-velocity dispersion relation in the solar neighborhood and a simple evolution model

Details The age-metallicity-velocity dispersion relation in the solar neighborhood and a simple evolution model The age-metallicity-velocity dispersion relation in the solar neighborhood and a simple evolution model

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245...57m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 57-74.

Astronomy and Astrophysics

Astrophysics

111

Astronomical Models, Galactic Evolution, Metallicity, Milky Way Galaxy, Star Formation, Astronomical Photometry, Early Stars, Iron, Stellar Atmospheres, Stellar Composition

Scientific paper

An analysis of the age-metallicity relation (AMR) based on previous data is conducted again and the age-velocity relation (AVR) is estimated for some nearby stars to examine connections between the relations. In the period of evolution of the galactic disk, an important relationship with age is determined for both AMR and AVR. The observed metallicity-velocity relation is compared to the predicted relation to verify the AVR and AMR derivations. A model is presented in which the star formation rate, the infall rate of gas, and the initial mass function are constant. The model is found to agree with observed constraints on star counts in the solar neighborhood and constraints on the chemical and kinematical evolution of the local disk. A theory regarding the primary heating mechanism of the galactic disk is developed in terms of the AVR, and possible explanations - massive gas clouds and transient spiral waves - are discussed.

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