Ultracam Photometry of Pulsating Subdwarf B Stars rf B Binaries in the Edinburgh-Cape Survey

High-speed multicolor photometry with ultracam promises to revolutionize the study of pulsating subdwarf B stars. As well as providing high S/N light curves with excellent temporal resolution, color amplitude ratios may be used to discriminate between different pulsation modes. In this paper we review the methods for mode determination developed for KPD 2109+4401 and HS 0039+4302 since the 2003 workshop. We also present a new dataset obtained over 6 nights in 2004 August for PG 0014+067. This was the first sdB star to be subjected to a detailed asteroseismological analysis. It was also the subject of the WET campaign in 2004 October/November (XCov24). We discuss the implications of our new observations for mode identification and rotation. We give an update of the results of a campaign to obtain orbital solutions of subdwarf B stars from the Edinburgh-Cape survey (Stobie et al. 1997). To date we have obtained blue spectra of 40 subdwarf B stars from the Edinburgh-Cape catalogue using the grating spectrograph at the 1.9 m Radcliffe telescope at the South African Astronomical Observatory. We find that 17 out of these 40 are certain binaries with a few other objects showing radial velocity variations of small amplitude. The binary f