Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...363..947j&link_type=abstract
Astronomy and Astrophysics, v.363, p.947-957 (2000)
Astronomy and Astrophysics
Astrophysics
35
Galaxy: Evolution, Galaxy: Solar Neighbourhood
Scientific paper
The G dwarf metallicity distribution of a mass limited sample of stars within 40 pc and south of delta =-26o and for which Ströomgren uvby and Hbeta photometry is available is studied. Special care is taken to ensure that the sample consists of stars with a main sequence lifetime longer than the age of the Galactic disk. Furthermore, binary stars, subgiants, active stars, etc. are removed to ensure that the sample is as clean as possible. The sample was limited to the mass interval 0.7-1.0 M_sun using masses determined by interpolation between theoretical evolutionary tracks. A mass interval was used as opposed to a color interval, as it is more directly comparable with theoretical models. The final sample contains 253 stars. Even though the sample shows a remarkably small low metallicity tail a new scale height weighting method was developed, and used. The resulting G dwarf distribution cannot be reconciled with the simple model for chemical evolution, in fact this dataset shows that the G dwarf problem is even larger than earlier results indicate.
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