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