Lunch talk on Nov. 9, 2020

Magnetic activity of late-type stars based on LAMOST and Kepler survey

Speaker: Liyun Zhang（Guizhou University）

Venue: Video conference

Time: 12:30 PM, Monday, Nov. 9, 2020

Abstract: 

Stellar magnetic activity is a common phenomenon in late-type stars. We will introduce the background of magnetic activity. LAMOST low and medium resolution spectral survey released numerous spectra of late-type stars. The Kepler and K2 missions also released a large amount of photometric data. We performed a statistical analysis on the magnetic activity of the late-type stars and their associated physical parameters by combining the spectroscopic data of LAMOST with the photometric data from the Kepler and K2 missions. We find that the flare frequency is consistent with the ratio of activities of these chromospheric activity indicators as a function of spectral type in M0–M3. We find the equivalent widths of H alpha have a significant statistical correlation with the flare amplitude in M-type stars. Moreover, the ratio of the flare energy and stellar luminosity is found to decrease with the stellar mass.

Report PPT:  SWIFAR_Liyun Zhang.pdf