Discovery of a 7.1 hour period and eclipses from MXB 1659-29

摘要: A 7.1 hr period has been discovered in the X-ray emission from 'transient' burst source MXB 1659-29. Erratic variations flux are seen during approximately 25 percent of cycle; at end this period, a stable dip occurs. Further analysis indicates that is, all probability, an eclipse by companion star low-mass binary system. The short (about 15 minute) duration is used to refine determination (7.114104 + or - 0.000168 hr) and constrain mass system parameters. found be range 0.25-0.9 solar mass; probabilistic arguments observations cataclysmic variables with comparable periods indicate most likely less massive than standard theories would indicate.