Trying to find a book I've read about ten years ago. It was translated into Russian, the original was (probably) written in English.
It was about a planet in a solar system with a single red giant star. The hero was the strong 'n silent type, some kind of cosmic tarzan, raised by a group of NH primates which, if i remember, at the time of the story are extint (killed by humans? ) He was sent to the planet as a part of a rescue attempt of the locals (?) by some galactic union. The inhabitants of the planet were refusing to leave the planet, their scripture(s) (or religious leaders?) forbidding them to do so. There was a blond woman(a seer?) travelling with the hero, assisting him on his quest. The woman in the end gets sacrificed by the natives to the sun/to bring warmth. There were also some strange races about, results of a genetic engineering (half human, half cats living underground? Under water?) created in an attempt to adapt to the planet.