Colloquium on May. 18, 2021

The complete sample and mass loss rate of red supergiants in M31 and M33

Speaker: Biwei Jiang (BNU)

Venue: SWIFAR Building, Room 2111

Time: 16:00 PM, Tuesday, May. 18, 2021

Abstract:

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.

Speaker's Profile:

Biwei Jiang (姜碧沩), Professor of Astronomy, Department of Astronomy, Beijing Normal University, received BSc from Department of Astronomy, Beijing Normal University in 1989, and PhD from Department of Astronomical Science, The Graduate University for Advanced Studies, Japan in 1997. She has been working on stellar and interstellar astronomy since the beginning of her career. Her main interested subjects include circumstellar matter of evolved stars, stellar light variation, interstellar extinction law from ultraviolet to infrared, and extinction and dust of supernova remnants.

Report PPT:  SWIFAR_Biwei Jiang.pptx