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The complete sample and mass loss rate of red supergiants in M31 and M33
报告题目:The complete sample and mass loss rate of red supergiants in M31 and M33
报 告  人:姜碧沩 教授(北京师范大学)
报告时间:2021-06-09 10:00:00
报告地点:天文楼212报告厅

摘要:

Red supergiants (RSGs) are massive Population I stars, the major progenitor of supernovae. With strong stellar wind, RSGs are an important source of interstellar dust, in particularly for the high redshift galaxies in the early universe when low-mass stars have not evolved to the asymptotic giant branch phase. However, the estimation of contribution of RSGs to interstellar dust suffers large uncertainty mainly because there is no complete sample of RSGs in any galaxy. This talk will present our recent work on building a complete sample of RSGs in M31 and M33 using a novel method based on the near-infrared color-color diagram to remove the foreground dwarf stars. Furthermore, the mass loss rate of RSGs and their whole contribution to the interstellar dust in M31 and M33 are calculated with the complete sample. Discussions on the potential exploration of the sample and the relation of mass loss rate with stellar parameters will be presented as well.


简介:

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。