Verlag der Oesterreichischen Akademie der Wissenschaften
Communications in Asteroseismology vol:157 pages:381
We present an analysis of about 400 high-resolution time-resolved VLT/UVES spectra of the eclipsing subdwarf binary system PG 1336 ‑018 - a rapidly pulsating subdwarf B primary in a short orbit with an M5 companion. We analysed the spectra of PG 1336 ‑018 with the aim to detect the pulsational signal of the primary in line-profile variations. After removing the domi- nant radial-velocity component inherent to the orbital motion, we computed cross-correlation functions for each individual spectrum and assumed these to approximate the average line profile. The dominant pulsation mode is detected in the cross-correlation functions and may lead to the first spectroscopic mode identification for this star.