1. Time Domain Astrophysics in South Africa 2 Astero-seismology

2. Monitoring Time variations in intrinsic variables in order to infer their properties such as mass, luminosity, rotation rate, internal composition

3. Seismic Waves trapped in Stars Stars pulsate according to y=A n ( r ) Y lm (theta, phi) exp(-omega t) Where n l m describe a mode A good start to astero-seismology is in determining these for as many modes as possible

4. Probing a star with seismic waves

5. Asteroseismology Research in South Africa Observational Studies include - mode identification using photometry alone (determines l) - mode identification using Baade-Wesselink methods (combination) - mode-identification by observing line profile variations On roAp stars, delta Scuti, sdB stars, beta Cepheid etc

6. Search for new Pulsating stars Rapidly Oscillating Ap stars (SAAO) 5 min < P puls <16 min

7. Frequency Spectrum dipole(-like) like nothing you have ever seen new, improved mode strange doublet

8. Pulsating sdB stars hot Horizontal Branch stars with temperatures of about 30,000 K Periods 2 -3 minutes

9. Observational Facilities Photo-electric photometers CCDs (also have frame-transfer) Giraffe spectrograph {R = 39000, wavelength 3820 - 9240 angstrom, V < 9} SALT ?

10. Theory Non-linear theory (SAAO) Radiative Transfer and Oscillations in A stars (UCT/SAAO)