Transformations between the theoretical and observational planes in the Hubble Space Telescope NICMOS and WFPC2 photometric systems

Color-temperature relations and bolometric corrections in the Hubble Space Telescope (HST) Near Infrared Camera and Multi-Object Spectrometer F1110W, F160W, and F222M and the Wide Field Planetary Camera 2 F439W, F555W, and F8 14W photometric systems, using two different sets of model atmospheres, hav e been derived. This database of homogeneous, self-consistent transformatio ns between the theoretical and observational planes also allows combination s of visual and infrared quantities without any further transformation betw een the two different photometric systems. The behavior of the inferred qua ntities under variation of the stellar parameters, the adopted model atmosp heres, and the instrumental configurations is investigated. Suitable relati ons to transform colors and bolometric corrections from HST to ground-based photometric systems are also provided.