High Resolution Spectroscopy of Pre-Main Sequence Stars

赫比格博士将利用MaunaKea上的Keck I望远镜及其租用的高分辨率光谱仪进行两部分调查，以(1)观察年轻星团中T Tauri区域上方的天体，据信在这些星团中应发现凌日在零年龄主序列上的大质量(=3个太阳质量)的前主序恒星和B和A型恒星，以及(2)研究两种前主序恒星(FUors和Exors)，虽然在光谱学和光度学上都有很大的不同，但它们都受到最低光变亮的影响。是否所有中等质量恒星都受到这种不稳定性的影响尚不确定。这项调查将揭示太阳系中的行星在太阳年轻时是否曾经经历过这种活动。

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.