I read the first half (third?) of a novella in a 1970s/early 80s copy of Analog or similar. I'd like to read the rest.
The story takes place on a planet that is flying through space on its own. Normally in deep space it would be frozen solid, but during the period of the story it is flying through a group of stars and will, for a period, be habitable and brightly lit. As it approached the closest, it became a huge interstellar tourist attraction and everyone who was everyone had to go.
The plot takes place some period (couple of years?) after the peak, and the planet is slowly depopulating again. The protagonist visits when he receives half of a two-half ring from a former girlfriend - they had promised to always come to the aid of the other if they recived the other half.
He arrives to find she is now the girlfriend/wife/concubine of a major factional leader who has been threatened somehow, and she's asking for him to look into it. The leader is a tarzan type who is less than happy with the "help".