报告题目：GW Ori: a unique target for studying protoplanetary disk evolution

　　报 告 人：房敏（亚利桑那大学，马德里自治大学， 紫金山天文台）

　　时间及地点：4月14日（周二）下午2:30-3:30，天文楼212报告厅

　　摘    要：Disks are expected to dissipate quickly in binary or multiple systems. Investigating such systems can improve our knowledge of the disk dispersal. The triple pre-main sequence stellar system GW Ori, still harboring a massive disk, is an excellent target. I have studied GW Ori using a large set of multi-wavelength photometric and spectral data ranged from optical bands to millimeter wavelengths. I will talk about its wind and accretion activity. The wind is found to be launched near the orbit of the second companion, and can be modulated by its orbit motion. I will compare the accretion activity of GW Ori with the predictions from the simulations of Artymowicz & Lubow (1996), and show how our results contradict with their simulations. I will present the results on study the variations in the SED of GW Ori which exhibits dramatic changes on timescales of ～20 yr in the near-infrared bands, implying a major readjustment of the inner disk on short timescales. In this talk, I will also present the first spatially-resolved millimeter interferometric observations of the disk around GW~Ori, obtained with the the Submillimeter Array (SMA), both in continuum and in the 12CO (J=2-1), 13CO (J=2-1), and C18O (J=2-1) lines. I will present the results on the disk of GW Ori by the simultaneous modelling of its SED and SMA data in continuum and gas line emission.

欢迎各位老师、同学参加！

　　                                       南京大学天文与空间科学学院