Communications in Asteroseismology vol:159 pages:45-47
JENAM 2008 Symposium No 4: Asteroseismology and Stellar Evolution date:8-12 September 2008
TW Dra is an Algol type system where the primary shows δ Sct oscillations. Time series of high-resolution spectra taken at the Thüringer Landessternwarte Tautenburg (TLS) show a complex pattern of moving bumps across the line profiles, indicating a rich spectrum of high-degree non radial pulsation modes. After the reductions to remove the signatures of the second and third components we analyze the line profiles using the FAMIAS program to derive the oscillation frequencies and to identify the pulsation modes. We describe the way in which mode identification can be done by FAMIAS and present first results.