Hubble Space Telescope NICMOS Color Transformations and Photometric Calibrations
Rich, R. Michael; Jablonka, Pascale; Frogel, Jay A.; Renzini, Alvio; Stephens, Andrew W.; Ortolani, Sergio; Davies, Roger
United States, Italy, United Kingdom, France, Germany
Abstract
This paper presents color transformations for Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) camera 2 observations to the ground-based Carnegie image tube photometric system at Cerro Tololo Inter-American Observatory (CIT/CTIO), using observations of 19 moderately bright, red stars in Baade's window in the color range 0.7<(J-K)<1.6. We emphasize that these transformations will be accurate only for cool giants of near-solar metallicity. We simulate both NICMOS and ground-based photometry by convolving near-IR spectra taken above the atmosphere with different filter transmission profiles. The results are consistent with our transformation.