Where are the brothers and sisters of the sun gone?
Sunday, March 15, 2009

The sun is 4.6 billion years ago in a group of a few thousand stars, says research by Simon Portegies Zwart of the University of Amsterdam. His analysis shows that these stars are found in a stereoscopic with a diameter of less than 20 light years and a mass of 500 to 3000 solar masses, especially on the other side of the Milky Way, about 44,000 light years from where we now live. The research results will soon be published in The Astrophysical Journal.

In the course of time the sun about 27 times around the Galaxy finally been at its present location at about 28,000 light years away from the center point. The stars with the sun were formed during that entire trip Friday close. The analysis shows that there is still a piece or 40 of them within a distance of a few hundred light years from the sun, and still travel. " These stars observable with future programs be identified, such as in 2011 to launch satellite Gaia, which is 1 billion stars in the galaxy map will bring.

The sun is like most other stars are not the only child born, but in a group. "But it was a huge surprise," says computational astrophysicist Portegies Zwart, "that so many of the stars together with the sun arose in the area geleven." The discovery of a brother or sister would be a important contribution to our understanding about the origin of the sun, thus Portegies Zwart.

This article is a press release from the Netherlands Research School for Astronomy.

Source: astroversum