Seminar: Imaging the photosphere of Betelgeuse with spectropolarimetry
- Date: –15:00
- Location: Ångströmlaboratoriet, Lägerhyddsvägen 1 Å73101
- Lecturer: Arturo Lopez Ariste
- Organiser: Division of Astronomy and Space Physics, Department of Physics and Astronomy
- Contact person: Eric Stempels
Linear polarization in the atomic spectral lines of Betelgeuse is due to the scattering depolarization of the continuum in the low photosphere. After integration over the stellar disk, the survival of a residual maps the existence of inhomogeneities in the surface of Betelgeuse. From such signals we image the photosphere of Betelgeuse and see convective structures (granulation or super-granulation) and their time evolution. After 4 years of accumulating data, we are able to measure the typical spatial scales of those convective structures and their dynamics in the low photosphere.