Title: Interstellar extinction and the distances to supernova remnants and molecular clouds

Speaker: Biwei Jiang

Institute: Beijing Normal University

Host: Siyi Feng

Time: 14:30-16:30, Thursday, May, 11

Location: Physics Building 552

Abstract:

Interstellar extinction increases with distance and presents a significant jump at the position of dense medium. This property makes it an important indicator of distance to the extended objects such as supernova remnants and molecular clouds. By taking the bluest color as the intrinsic color for a given set of stellar parameters, the interstellar extinction is calculated with relatively high accuracy for millions of stars from the stellar parameters derived in large-scale spectroscopic surveys including LAMOST and APOGEE. With the Gaia distance, the distances to several tens of SNRs and molecular clouds. Accordingly, the dust properties implied in the extinction law are discussed.

Bio：

姜碧沩，北京师范大学天文系教授。1989年毕业于北京师范大学天文系，1997年于日本综合研究大学院大学获得理学博士学位，一直从事星际介质和恒星天文学的研究。主要研究课题有：演化晚期恒星的星周气体和尘埃，本星系群星系中的红超巨星光变和质量流失率，从红外到紫外的星际消光规律，超新星遗迹的消光和尘埃。