Local Metallicity Distribution Function Derived from Galactic Large-scale Radial Iron Pattern Modeling

We develop an approach for fitting the results of modeling a wriggling radial large-scale iron pattern along the Galactic disk, derived over young (high-mass) Cepheids, with the metallicity distribution obtained using low-mass long-living dwarf stars in the close solar vicinity. For this purpose, du...

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Bibliographic Details
Published in:The Astrophysical journal 2019-12, Vol.887 (2), p.238
Main Authors: Mishurov, Yu. N., Tkachenko, R. V.
Format: Article
Language:English
Subjects:
Algorithms
Astronomical models
Astrophysics
Cepheid variables
Distribution functions
Dwarf stars
Galactic disk
Galaxy abundances
Initial mass function
Iron
Low mass stars
Metallicity
Milky Way disk
Solar neighborhood
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Summary:We develop an approach for fitting the results of modeling a wriggling radial large-scale iron pattern along the Galactic disk, derived over young (high-mass) Cepheids, with the metallicity distribution obtained using low-mass long-living dwarf stars in the close solar vicinity. For this purpose, during the step at which the theoretical abundance distribution over low-mass stars in the solar vicinity is computed, we propose the redefinition of the initial mass function so that the resulting theoretical stellar distribution over masses would be close to the distribution in the observed sample. By means of the above algorithm and subsequent corrections of the theoretical metallicity distribution function (MDF), as described in the literature, we have achieved fairly good agreement between the theoretical and observed MDFs for low-mass stars in the local solar vicinity.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab563d