The seminars are on Wednesdays at 4.00 p.m. in
the Lennard-Jones lecture hall (LJ1.75) and sometimes in the LJ Library (LJ1.25). All welcome.
Click here for directions.
- 3 May 2017
Isabelle Baraffe (University of Exeter): A new generation of multi-dimensional stellar structure models
I will present the recent development of multi-dimensional stellar structure models based on a fully compressible hydrodynamical time implicit code, the MUSIC code, devoted to stellar and planetary interiors. I will discuss the main challenges in the computations of multi-dimensional stellar structures and some of the advantages of our approach with MUSIC for the study of stellar fluid dynamics problems. MUSIC is interfaced with our stellar evolution code and with MESA, which provide initial 1D stellar structures for any type of star and allow exploration of a wide range of stellar phases and masses. I will present our first applications to a variety of problems, in particular the study of accretion's effect on the structure of very young low mass stars and the problem of convection and overshooting in pre-MS stars. I will show the success of our approach with MUSIC for the treatment of overshooting in pre-main sequence stars within the context of lithium depletion in the Sun and in solar-like stars. A major motivation for these studies is to derive new prescriptions to be implemented in stellar evolution codes and to improve stellar evolution models that are widely used in stellar and galactic astrophysics.
- 10 May 2017
John Beckman (IAC Tenerife): The GHaFaS Fabry-Perot system on the WHT: Radioastronomy at Optical Wavelengths
Of the three principal phases of hydrogen in the interstellar medium: molecular, atomic, and ionized, the first two are now extensively used for kinematic and dynamical studies of extended objects, notably galaxies, thanks to the 21 cm line for atomic hydrogen, and the CO emission lines for molecular hydrogen, respectively. The two are widely studied, both locally and at increasing redshift, and form the backbone of radioastronomical research. Perhaps surprisingly, observations of ionized hydrogen, which requires the visible, normally H-alpha, have lagged well behind. In this talk I will explain how we can obtain velocity fields of complete galaxies (as well as of local extended objects) at high spatial and spectral resolution with the Fabry-Perot technique. I will show with examples that it is highly competitive, and complementary to the HI and CO observations, in many ways much more efficient, and can tell us a great deal about galctic dynamics and structure, as well as about topics as varied as massive stellar feedback in galactic discs, the physics of supernova remnants, and different modes of star formation.
- 24 May 2017
Emily Brunsden (York University): Spectroscopic Mode Identification of Gamma Doradus Stars
- 7 June 2017
If you would like to give a talk in our seminar programme, please contact Nick Wright (n.j.wright AT keele.ac.uk).
Past seminars (2016/17)
- 12 October 2016, 4pm, room LJ 1.75
University of Cambridge
Studying planet formation in the era of ALMA
- 26 October 2016, 4pm, room LJ 1.75
A Binary View of Massive Stars
- 9 November 2016, 4pm, room LJ 1.75
Trinity College Dublin
The surprising look of massive stars before death
- 23 November 2016, 4pm, room LJ 1.75
Accretion disks around massive stars: the revolution with ALMA
- 7 December 2016, 4pm, room LJ 1.75
Liverpool John Moores University
The Large Robotic Telescope: a facility for the new era of time domain astronomy
- 25 January 2017,11am, room LJ 1.25
Magnetic Massive Stars
- 1 February 2017, 4pm, room LJ 1.75
Investigations of Star Formation with the UKIRT Widefield Infrared Survey for H2
- 15 February 2017, 4pm, room LJ 1.75
Queen's University Belfast
Understanding the Explosions of Massive Stars
- 22 March 2017, 4pm, room LJ 1.01
Mapping AGN winds and circumnuclear absorbers from the smallest to the largest scales