神秘的PMS稀释剂HD 142666的MOST光度测定
MOST photometry of the enigmatic PMS pulsator HD 142666
摘要：
本文介绍了用MOST（Microvariability & Oscilations of Stars）卫星连续两年获得的脉动Herbig Ae星HD 142666的精确测光结果。在此之前，HD 142666只有一个已知的脉动周期。MOST测光表明HD 142666是多周期的。然而，脉动频率的独特识别是复杂的不规则变化所造成的恒星的拱星尘埃盘的存在。MOST在2006年和2007年获得的两条光变曲线为研究HD 142666的脉动和监测星周变化提供了前所未有的高质量数据。我们将12个频率归因于脉动。模型拟合的三个频率与最高振幅的谎言很好的不确定性框以外的恒星的位置在HR图的基础上公布的值。这些模型表明，要么（1）基于拱星盘半径和恒星光度之间的关系，对HD 142666的光度的公开估计过高，和/或（2）在我们的模型中可能需要额外的物理学，如质量吸积，以准确地拟合观测到的频率和HD 142666在HR图中的位置。
英文摘要：
We present precise photometry of the pulsating Herbig Ae star HD 142666 obtained in two consecutive years with the MOST (Microvariability & Oscilations of STars) satellite. Previously, only a single pulsation period was known for HD 142666. The MOST photometry reveals that HD 142666 is multi-periodic. However, the unique identification of pulsation frequencies is complicated by the presence of irregular variability caused by the star's circumstellar dust disk. The two light curves obtained with MOST in 2006 and 2007 provided data of unprecedented quality to study the pulsations in HD 142666 and also to monitor the circumstellar variability. We attribute 12 frequencies to pulsation. Model fits to the three frequencies with the highest amplitudes lie well outside the uncertainty box for the star's position in the HR diagram based on published values. The models suggest that either (1) the published estimate of the luminosity of HD 142666, based on a relation between circumstellar disk radius and stellar luminosity, is too high and/or (2) additional physics such as mass accretion may be needed in our models to accurately fit both the observed frequencies and HD 142666's position in the HR diagram.
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