/*
* 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