NICMOS to Ground-Based Systems Transformations
A total of six stars (2 white dwarfs, 2 solar analogs and
2 redden stars; see table) have been observed through the
NICMOS JHK system (i.e. F110W, F160W and F222M filters) to
help establish transformations between NICMOS and ground-based
near-infrared systems.
HST fluxes have been measured for all the HST standards and converted
into magnitudes using the fluxes for a zero magnitude star
(see column ZP(Vega) in the table of Current Values for NICMOS
Photometric Keywords and Zeropoint in VEGAMAG System).
The table below includes the NICMOS HST and ground-based (when available)
magnitudes for the standard stars observed with HST. For each star,
NICMOS Standards
"Nov 25, 1998. The Table below is in the process of being updated. We have
found a ~0.1 mag discrepancy between the ground-based J, H, K values for
the solar analogs and the white dwarf that we used and the corresponding
published values (Persson et al. 1998, AJ, 116, 2475."
| STAR | Category | F110W | J | F160W | H | F222M | K |
| G191-B2B | WD | 12.49 | 12.68 | 12.71 | 12.72 | 12.83 | --- |
| | | 0.02 | 0.02 | 0.02 | 0.03 | 0.02 | |
| GD153 | WD | 14.04 | --- | 14.23 | --- | 14.36 | --- |
| | | 0.02 | | 0.02 | | 0.02 | |
| P330E | G star | 12.01 | 11.96 | 11.57 | 11.59 | 11.49 | 11.51 |
| | | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
| P177D | G star | 12.47 | --- | 12.02 | --- | 11.93 | --- |
| | | 0.02 | | 0.02 | | 0.02 | |
| BRI0021 | red | 12.45 | 11.835 | 11.28 | 11.086 | 10.48 | 10.552 |
| | | 0.02 | 0.008 | 0.02 | 0.007 | 0.02 | 0.010 |
| OPH-S1 | red | 9.48 | 8.80 | 7.44 | 7.27 | 6.36 | 6.33 |
| | | 0.02 | <0.015 | 0.02 | <0.015 | 0.02 | <0.015 |
| CSKD_12 | red | 12.26 | 11.585 | 9.73 | 9.506 | 8.61 | 8.617 |
| | | 0.02 | 0.007 | 0.02 | 0.005 | 0.02 | 0.007 |
NOTES:
- JHK magnitudes for OPHS1 come from
Elias et al. 1982, AJ 87, 1029.
- JHK magnitudes for P330E, BRI0021 and CSKD21 come from ground-based
measurements made by the NICMOS ID team (M. Rieke, private comm.)
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