Disk Fraction in a Low-Metallicity Environment

被引：0

作者：

Yasui, Chikako ^{[1
]}

Kobayashi, Naoto ^{[1
]}

Tokunaga, Alan T. ^{[2
]}

Saito, Masao ^{[3
]}

Tokoku, Chihiro ^{[4
]}

机构：

[1] Univ Tokyo, Inst Astron, Sch Sci, 2-21-1 Osawa, Tokyo 1810015, Japan

[2] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[3] Natl Astron Observ Japan, ALMA Project, Mitaka, Tokyo 1818588, Japan

[4] Tohoku Univ, Inst Astron, Sendai, Miyagi 9808578, Japan

来源：

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY | 2009年 / 1158卷

基金：

日本学术振兴会;

关键词：

infrared: stars; planetary systems: protoplanetary disks; stars: pre-main-sequence; open clusters and associations: individual (Digel Cloud 2); stars: formation; EXTREME OUTER GALAXY; STAR-FORMATION; CLUSTERS;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The extreme outer galaxy (EOG), at a galactic radius of more than 18 kpc, is known to have very low metallicity. We find that in two very young (similar to 0.5 Myr) star-forming clusters in the EOG the fraction of stars with near-infrared excess is significantly lower than for those in the solar neighborhood. Our results suggest that most stars forming in the low-metallicity environment experience disk dispersal at an earlier stage (<1 Myr) than those forming in the solar metallicity environment (as much as similar to 5-6 Myr).

引用

页码：171 / +

页数：2

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