HR 465
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HR 465 (GY Andromedae or GY And) is a variable star in the in the constellation Andromeda. It belongs to the group of CP stars, but its most striking speciality is the occurrence of the element promethium in the spectrum of the star. HR 465 is so far the only star in which promethium is found.
References
Aller, M. F. 1971. "Promethium in the star HR465" Sky & Telescope, vol.41, pp.220-222 Template:Star-stub