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HD 149026
HD 149026 is a yellow subgiant star approximately 260 light-years away in the constellation of Hercules. The star is thought to be much more massive, larger, and brighter than the Sun. , an extrasolar planet has been confirmed to be orbiting the star. The name of this star comes from its identifier in the Henry Draper Catalog.
== The star ==
The star is thought to be much more massive, larger, and brighter than the Sun. The higher mass of the star causes that despite considerably younger age (2.0 Ga) it is already much more evolved than the Sun. The internal fusion of hydrogen in the core of the star is coming to an end, and it is beginning to evolve towards red gianthood. HD 149026 is about 260 light-years distant,〔 which means the star is not visible to the unaided eye. However, it should be an easy target to binoculars or a small telescope.〔
The star is over twice as enriched with chemical elements heavier than hydrogen and helium as the Sun. Because of this and the fact that the star is relatively bright, a group of astronomers in N2K Consortium began to study the star. The star's anomalous composition as measured may be surface pollution only, from the intake of heavy-element planetesimals.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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