/* * Copyright (C) 2021 Christopher J. Howard * * This file is part of Antkeeper source code. * * Antkeeper source code is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Antkeeper source code is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Antkeeper source code. If not, see . */ #ifndef ANTKEEPER_COLOR_INDEX_HPP #define ANTKEEPER_COLOR_INDEX_HPP namespace color { /// Functions which operate on color indices. namespace index { /** * Approximates the temperature of a star, given its B-V index. * * @param bv B-V index. * @return Correlated color temperature, in Kelvin. * * @see Ballesteros, F. J. (2012). "New insights into black bodies". EPL 97 (2012) 34008. */ template T bv_to_cct(T bv) { return T{4600} * (T{1} / (T{0.92} * bv + T{1.7}) + T{1} / (T{0.92} * bv + T{0.62})); } } // namespace index } // namespace color #endif // ANTKEEPER_COLOR_INDEX_HPP