Rapid dissipation of protoplanetary disks in Ophiuchus
Rapid dissipation of protoplanetary disks in Ophiuchus
复制标题
蛇夫座原行星盘的快速消散
DOI：
10.1093/pasj/psv062
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Y. et al.
中科院分区：
文献类型：
--
作者：
Takagi;Y. et al.
我们提出了蛇夫座分子云中前主序星的年龄测定研究结果。八颗前主序恒星的年龄是根据高分辨率光谱得出的表面重力估算的。目标恒星的平均年龄为 0.7 Myr。通过比较个体年龄和近红外颜色过剩，我们发现颜色过剩以恒定的速率逐渐减少，内盘的寿命确定为1.2 Myr。与用相同方法估算的金牛座分子云中前主序星的寿命相比，估算的寿命缩短了近一半。这一结果表明盘演化时间尺度取决于恒星形成区域的环境。
We present the results of an age determination study for pre-main sequence stars in the Ophiuchus molecular cloud. The ages of eight pre-main sequence stars were estimated from surface gravities derived from high-resolution spectroscopy. The average age of the target stars was 0.7 Myr. By comparing the individual age and the near-infrared color excess, we found that color excess decreases gradually with a constant rate and the lifetime of the inner disk was determined to be 1.2 Myr. The estimated lifetime is nearly a half of the time compared to that of the pre-main sequence stars in the Taurus molecular cloud estimated with the same method. This result indicates that the disk evolution timescale depends on the environment of the star-forming region.