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 F814W photometric systems, using two different sets of model atmospheres, have been derived. This database of homogeneous, self-consistent transformations between the theoretical and observational planes also allows combinations of visual and infrared quantities without any further transformation between the two different photometric systems. The behavior of the inferred quantities under variation of the stellar parameters, the adopted model atmospheres, and the instrumental configurations is investigated. Suitable relations to transform colors and bolometric corrections from HST to ground-based photometric systems are also provided.