Query : 2001A&A...377..911F

2001A&A...377..911F - Astronomy and Astrophysics, volume 377, 911-924 (2001/10-3)

The solar neighbourhood age-metallicity relation. Does it exist?


Abstract (from CDS):

We derive stellar ages, from evolutionary tracks, and metallicities, from Stroemgren photometry, for a sample of 5828 dwarf and sub-dwarf stars from the Hipparcos Catalogue. This stellar disk sample is used to investigate the age-metallicity diagram in the solar neighbourhood. Such diagrams are often used to derive a so called age-metallicity relation. Because of the size of our sample, we are able to quantify the impact on such diagrams, and derived relations, due to different selection effects. Some of these effects are of a more subtle sort, giving rise to erroneous conclusions. In particular we show that [1] the age-metallicity diagram is well populated at all ages and especially that old, metal-rich stars do exist, [2] the scatter in metallicity at any given age is larger than the observational errors, [3] the exclusion of cooler dwarf stars from an age-metallicity sample preferentially excludes old, metal-rich stars, depleting the upper right-hand corner of the age-metallicity diagram, [4] the distance dependence found in the Edvardsson et al. (1993A&A...275..101E) sample by Garnett & Kobulnicky (2000ApJ...532.1192G) is an expected artifact due to the construction of the original sample. We conclude that, although some of it can be attributed to stellar migration in the galactic disk, a large part of the observed scatter is intrinsic to the formation processes of stars.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - stars: late-type - solar neighbourhood - galaxy: stellar content

VizieR on-line data: <Available at CDS (J/A+A/377/911): table1.dat>

Simbad objects: 4

goto Full paper

goto View the references in ADS

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 - 2023
1 HD 224723 * 00 00 15.1310807856 +23 31 45.221667816   9.01 8.51     G0 23 0
2 HD 224742 SB* 00 00 17.8950481608 +13 18 44.041970340   7.96 7.55     F2V 27 0
3 HD 224743 * 00 00 23.8015167360 -10 27 44.585145072   8.54 8.11     F3/5V 22 0
4 HD 224763 PM* 00 00 26.9489449608 -16 41 49.234416180   7.88 7.44     F3V 28 0

To bookmark this query, right click on this link: simbad:objects in 2001A&A...377..911F and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact