A search for variable subdwarf B stars in <i>TESS</i> Full Frame Images III. An update on variable targets in both ecliptic hemispheres – contamination analysis and new sdB pulsators

ABSTRACT We present an update on the variable star survey performed TESS 30 min Full Frame Image (FFI) data reported by our first two papers in this series. This includes a contamination analysis order to identify false positives and of 10 FFI collected during Years 3 4 mission. clarify variability status 2 995 targets identifying 1 403 stars. In addition, we spectroscopically classify 24 pre-filtered sampled with discover 11 new sdB pulsators. Future follow-up space- and/or ground-based variables here, nature their reveal spectroscopic parameters stars, would complement work.