Query : 2000A&A...363..947J

2000A&A...363..947J - Astronomy and Astrophysics, volume 363, 947-957 (2000/11-3)

The G dwarf problem. Analysis of a new data set.


Abstract (from CDS):

The G dwarf metallicity distribution of a mass limited sample of stars within 40 pc and south of δ=-26° and for which Stroemgren uvby and Hβ 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 0.7-1.0M 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.

Abstract Copyright:

Journal keyword(s): Galaxy: evolution - Galaxy: solar neighbourhood

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 HD 113083 PM* 13 01 26.2705909615 -27 22 28.312946309   8.58 8.05     G1V 97 0
2 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 886 0
3 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 958 1
4 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1203 0

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