Peter J. McGregor , Michael Dopita , Peter Wood , Michael G. Burton, PASA, 18 (1), in press.
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Guide Star Requirements
Observations with NIFS and the ALTAIR natural guide star system will require an optical AO guide star brighter than mag within of the science object and a near-infrared OIWFS guide star within the 120'' diameter ALTAIR field and brighter than perhaps mag for slow flexure correction. When the ALTAIR laser guide star upgrade has been implemented, an AO guide star with R < 17-19 mag and within of the science object (Ellerbroek & Tyler 1998) will still be required for rapid tip-tilt correction. A near-infrared OIWFS guide star will also be required for slow flexure correction, or suitably bright OIWFS guide stars may be used for rapid tip-tilt correction in the near-infrared. These are demanding requirements for many science programs.
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