Several Paschen series lines and other lines will be used to test infall models. The FOE data have already produced one new WTTS orbit solution. The FOE observations revealed double-lined structure in the optically bright member and were sufficient to determine orbital elements for its 51 day orbit. The radial velocity data are shown below. The angular momentum implied requires that it have a close unseen companion or that it be the product of a binary merger.
Evidence tends to favor the latter possibility.
In those data I found a periodic variation of absorption linewidth that suggested non-radial pulsations. Other less extensive datasets revealed different patterns of linewidth variation. In 1994 May I obtained 403 new FOE spectra during an 8 night run on the KPNO 2.1-m telescope. Larry Ramsey and I wanted to get higher quality data that would also provide better time sampling to study our pulsation hypothesis further. REU student Peter Ratzlaff worked with me on these data.