Submillimeter array observations of disks in the SR 24 multiple star system

被引:31
作者
Andrews, SM [1 ]
Williams, JP [1 ]
机构
[1] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
基金
美国国家科学基金会;
关键词
binaries : close; circumstellar matter; stars : individual (SR 24);
D O I
10.1086/427325
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present high-resolution aperture synthesis images from the Submillimeter Array of the 225 GHz (1.3 mm) continuum and (CO)-C-12 J = 2-1 line emission from the disks around components of the hierarchical triple system SR 24, located in the Ophiuchus star-forming region. The most widely separated component, SR 24 S (with a projected semimajor axis a = 832 AU), has a circumstellar disk with properties typical of those around single T Tauri stars. The binary SR 24 N (a = 32 AU) is undetected in the continuum but has strong, resolved emission that likely originates in a circumbinary disk with a central gap. The data constrain the total disk mass in the SR 24 N system to be less than or similar to 10(-3) M-., and indicate that the depletion of CO onto dust grains is not more than 100 times larger than the mean value in the interstellar medium. The SR 24 N disk is unusual in that it is only detected in line emission. It is possible that other low-mass disks around binaries and single stars may have been missed in single-dish continuum surveys.
引用
收藏
页码:L175 / L178
页数:4
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