Reference Standards in the Gunn-Thuan Filter System for Approximate Calibration of Southern-Hemisphere Survey Work

Session 7 - Catalogs & Surveys.
Display session, Monday, January 13
Metropolitan Ballroom,

[7.06] Reference Standards in the Gunn-Thuan Filter System for Approximate Calibration of Southern-Hemisphere Survey Work

M. G. Smith (NOAO/CTIO), A. Athey (Pomona College), E. Friel (NSF(MPS/AST))

As a preliminary step in a southern-hemisphere survey (i) for quasars of redshift 4.5>z>7, and (ii) for faint, red, high-latitude stars, we have made experimental observations of standard stars and sequences spanning a total range of 15 magnitudes through the Johnson and Gunn-Thuan filter systems.

We report preliminary Gunn-Thuan magnitudes for the stellar sequence near NGC300 observed in UBVRI by Walker (PASP,100,949;PASP,107,683). Our work is approximate, but of sufficient precision for the purposes of this survey.

Program listing for Monday