PRIMARY GOALS:
1 - Relative flux references accurate to 1.5% for standard photometry
2 - Color transformations between groundbased and NICMOS systems
3 - Relative absolute wavelength & spectrophotometric references for Grisms
4 - Polarization standards
EXISTING GROUND-BASED STANDARD STAR LISTS ARE INADEQUATE
* Dirth of suitable observations to rule out low-level NIR variability for most stars.
* Large numbers of well-measured stars are not available in J,H,K
* Dispersion in NIR colors is very small in G-stars
* Minimun number of strong spectral features in NIR
* Solar spectrum available throughout range of NICMOS sensitivity
1) SOLAR ANALOGS: From HST Guide Star Photometric Survey (Lasker & Sturch)
a) 0.55 < B-V < 0.72 Screen for solar analogues
b) 10.5 < Kest < 12.3 (emperical relation used for Kest)
c) E(B-V) < 0.05 (Minimal extinction, Burnstein & Heiles reddening maps)
Prioritize selection based upon HST Guide Star Availability/Suitability Windows
2) M-DWARFS: w/o H[[alpha]] (non-variable) with V-K <= 8 for color transformations. (VRIJHK observations being made and will be checked for IRAS fluxes)
3) Several WHITE DWARFS used as on-orbit HST calibrators for other SIs added. (HZ44, Feige 66, and G191B2B have already been observed at least once)
Cross-calibrate using Elias et al. (1982, AJ, 87, 1029) list.
Observe prioritized targets on at least 5 nights (screen for variables at 1.5% level)
Northern Hemisphere: NICMOS2 array on Mt. Lemmon 60" & Kitt Peak 90"
Southen Hemisphere: NICMOS3 array on Las Campanas 40"