Hd 290327

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HD 290327 is a 9th magnitude G-type subgiant star located approximately 179 light years away in the constellation Orion. This star is larger, cooler, fainter, and less massive than our Sun. Also its metal content is seven-ninths as much as the Sun. In 2009, a gas giant planet was found in orbit around the star. A subgiant star is a star that is slightly brighter than a normal main-sequence (dwarf) star of the same spectral class, but not as bright as true giant stars. Although certain subgiants appear to be simply unusually bright metal-rich hydrogen-fusing stars (in the same way subdwarfs are unusually dim metal-poor hydrogen-fusing stars), they are generally believed to be stars that are ceasing or have already ceased fusing hydrogen in their cores. In stars of roughly a solar mass, this causes the core to contract, which increases the star's central temperature enough to move hydrogen fusion into a shell surrounding the core.