High Resolution Spectroscopy of Pre-Main Sequence Stars

赫比格博士将利用莫纳克亚山上的凯克1号望远镜和它的HIRES高分辨率光谱仪进行两部分的调查：(1)检查位于年轻星团金牛座T区上方的物体，据信在那里应该发现大质量（= 3个太阳质量）的前主序星，它们正在过渡到零年龄主序星的B型和a型；(2)调查两种前主序星（FUors和EXors），虽然在光谱学和光度学上非常不同，但两者都受到最小光的不可预测的亮度的影响。是否所有的中等质量恒星都受到这种不稳定性的影响是不确定的。这项调查将揭示在太阳年轻的时候，我们太阳系的行星是否曾经暴露在这样的活动中。

Dr. Herbig will carry out a two-part investigation with the Keck I telescope on Mauna Kea and its HIRES high-resolution spectrograph to (1) examine objects located above the T Tauri region in young clusters, where it is believed that massive (= 3 solar mass) pre-main sequence stars in transit to B- and A-types on the zero-age main sequence should be found and (2) investigate two species of pre-main sequence stars (FUors and EXors) that, although very different spectroscopically and photometrically, are both subject to unpredictable brightenings from minimum light. Whether all intermediate-mass stars are subject to this instability is uncertain. This investigation will shed light on whether the planets on our solar system were once exposed to such actvity when the Sun was young.