Evidence for extinction and accretion variability in T Tauri South

被引:17
作者
Beck, TL [1 ]
Prato, L
Simon, M
机构
[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
关键词
binaries : visual; infrared : stars; stars : individual (T Tauri); stars : pre-main-sequence; stars : variables : other;
D O I
10.1086/320236
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present angularly resolved spectra of T Tau North and South in the 3 mum water-ice feature and K band. Most of the water-ice absorption lies along the line of sight toward T Tau South, confirming that it is viewed through stronger extinction. A decrease in ice-band absorption toward T Tau S between 1998 December and 2000 January, significant at the 2 sigma level, was associated with an increase in its near-IR flux. Br gamma emission is detected in T Tau North and South and H-2 (2.12 mum) emission toward only T Tau South, consistent with previous studies of infrared companions to T Tauri stars. Our results suggest that the near-IR variability of T Tau S is probably caused by both variations in accretion rate and variable extinction along the line of sight.
引用
收藏
页码:1031 / 1036
页数:6
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