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Title:
The Lost Siblings of the Sun
Authors:
Portegies Zwart, Simon F.
Publication:
The Astrophysical Journal Letters, Volume 696, Issue 1, pp. L13-L16 (2009). (ApJL Homepage)
Publication Date:
05/2009
Origin:
IOP
ApJ Keywords:
Galaxy: kinematics and dynamics, Galaxy: stellar content, solar system: formation, solar system: general, Sun: general
DOI:
10.1088/0004-637X/696/1/L13
Bibliographic Code:
2009ApJ...696L..13P

Abstract

The anomalous chemical abundances and the structure of the Edgeworth-Kuiper belt observed in the solar system constrain the initial mass and radius of the star cluster in which the Sun was born to M sime 500-3000M sun and R sime 1-3 pc. When the cluster dissolved, the siblings of the Sun dispersed through the galaxy, but they remained on a similar orbit around the Galactic center. Today these stars hide among the field stars, but 10-60 of them are still present within a distance of ~100 pc. These siblings of the Sun can be identified by accurate measurements of their chemical abundances, positions, and their velocities. Finding even a few will strongly constrain the parameters of the parental star cluster and the location in the Galaxy where we were born.
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