Phoenix Completes Run at Gemini South

Phoenix, the high-resolution near-infrared visiting spectrograph (PI Ken Hinkle of NOAO), returned to Gemini South for a 6-night run in April. The observing started well, but later parts of the run were affected by poor seeing and clouds, and a significant number of GMOS queue observations were folded in as backup. Phoenix data were taken for five science programs. Themes covered a range of stellar, pre-stellar and binary star areas, including the contribution of asymptotic giant branch (AGB) stars to the origin of fluorine, isotopic abundances and the evolution of binary stars, the evolution of magnetic fields during pre-main sequence evolution, the CO emitting region in a peculiar B supergiant, and orbitally-modulated accretion in pre-main-sequence binaries.