Forbidden Line Emission in the Eccentric Spectroscopic Binaries DQ Tauri and UZ Tauri E Monitored Over an Orbital Period

Huerta, M., Hartigan, P. (Rice) and White, R. (UT)
We present echelle spectroscopy of the close premain-sequence binary star systems DQ Tau and UZ Tau E. Over a 16 day time interval we acquired 14 nights of spectra for DQ Tau and 12 nights of spectra for UZ Tau E. This represents the entire phase of DQ Tau and 63% of the phase of UZ Tau E. As expected, photospheric lines such as Li I 6707 clearly split into two components while the primary and secondary orbit one another, as did the permitted line He I 5876. Unlike the photospheric features, the forbidden lines of [O I] 6300 and [O I] 5577 retain the same shape throughout the orbit. Therefore, these lines must originate outside the immediate vicinity of the two stars and any circumstellar disks that participate in the orbital motion of the stars.

Journal of publication: AJ 129, 985 (2005).