Welcome to the homepage of the IAU Working Group on Active B Stars and its Be Star Newsletter.
The Working Group on Active B Stars (WGABS) was formed to promote and stimulate research and international collaboration in the field of active B stars. The WGABS is open to all researchers interested in the field.
Please Note: We will be gradually updating and refurbishing the web page, beginning with this home page.
Upcoming: IAU Working Group on Active B Stars Talks
The WG has series of talks, normally held the third Wednesday of each month at 9:00 am Eastern Time (EST), by zoom. The next talk is scheduled for Wednesday, January 19, 2022.
Speaker: Dr. Alessia Franchini
Title: Disc eccentricity driving type I and type II outbursts in Be/X-ray binaries
Be star X-ray binaries are transient systems that show two different types of outbursts. Type I outbursts occur each orbital period while type II outbursts, much brighter, have a period and duration that are not related to any periodicity of the binary system. Observations of these outbursts from different sources show that their characteristics and occurrence depend on the binary orbital properties. In particular, some sources can display type II outburst pairs as well as non-periodic type I outbursts. In this talk I will present our recent effort to explain these very interesting and peculiar phenomena through the dynamics of eccentric and precessing Be star decretion discs.