Measuring tiny mass accretion rates onto young brown dwarfs

被引：0

作者：

Herczeg, Gregory J. ^{[1
]}

Cruz, Kelle ^{[1
]}

Hillenbrand, Lynne A. ^{[1
]}

机构：

[1] CALTECH, MC105-24,1200 E Calif Blvd, Pasadena, CA 91125 USA

来源：

COOL STARS, STELLAR SYSTEMS AND THE SUN | 2009年 / 1094卷

基金：

美国国家航空航天局;

关键词：

stars: pre-main sequence; stars: low-mass; T-TAURI STARS; UPPER SCORPIUS; 5; MYR; ASSOCIATION; EVOLUTION; EMISSION; DISKS; BLUE;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present low-resolution Keck I/LRIS-ADC spectra spanning from 3200-9000 angstrom of six young brown dwarfs in the TW Hya Association and in Upper Sco. The optical spectral types of the sample range from M7.25-M8.75, though two have near-IR spectral types of early L-dwarfs. For four brown dwarfs in our sample, the accretion luminosity is measurable only when the image is binned over large wavelength intervals. This method extends our sensivity to accretion rate down to similar to 10(-13) M-circle dot yr(-1) for brown dwarfs.

引用

页码：529 / +

页数：2

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