Science Seminars

9/01/2016 – Stanley Owocki; Massive Star Magnetospheres

Speaker: Stanley Owocki (Bartol Research Inst, U. Delaware)
Date: Tuesday, Sep 01, 2020
Time: 4:00 PM
Location: SPSC W120

Seminar Abstract:

Massive, luminous, hot stars lack the hydrogen recombination convection zone that induces the magnetic dynamo cycle of cooler, solar-type stars. Nonetheless, modern spectropolarimetry has revealed that about 10% of O, B and A-type stars harbor large-scale, organized (often predominantly dipolar) magnetic fields ranging in dipolar strength from a few hundred to tens of thousand Gauss. This talk will discuss the role of such fields in channeling and trapping the radiatively driven winds of  massive stars.  A particular focus will be on the interplay of rotation and magnetic fields, for example in the centrifugal support of material in closed loops, and in the rotational spindown from angular momentum loss from  open field regions.