Triggered star formation in the Sco OB2 association

被引：0

作者：

Preibisch, T ^{[1
]}

Zinnecker, H ^{[1
]}

Guenther, E ^{[1
]}

机构：

[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany

来源：

MODES OF STAR FORMATION AND THE ORIGIN OF FIELD POPULATIONS, PROCEEDINGS | 2002年 / 285卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We explore the star formation history of the Upper Scorpius OB association the youngest part of the large Sco OB2 association. After an initial wide field (160 square-degree) survey for solar-mass pre-main sequence (PMS) stars in Upper Scorpius, we have performed a deeper survey for low-mass (similar to0.1 - 0.7 Mcircle dot ) PMS stars, covering a 6 square-degree area. Our current PMS sample contains nearly 200 stars. in a detailed analysis of the locations of these stars in the H-R diagram, taking proper account of the uncertainties and the effects of unresolved binaries, we find a mean stellar age of about 5 Myr and no evidence for a significant age dispersion among these stars. This implies that the star formation history of the Upper Scorpius association was dominated by a short starburst, which started about 5 Myr ago and ended probably not more than one or two Myr later. This result strongly suggests that the shock wave of a supernova explosion in the nearby Upper Centaurus-Lupus association, which crossed Upper Scorpius just about 5 Myr ago, triggered the starburst in Upper Scorpius.

引用

页码：97 / 104

页数：8

共 36 条

[21]

Preibisch T, 1998, ASTRON ASTROPHYS, V333, P619

[22] The history of low-mass star formation in the Upper Scorpius OB association [J].