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HD 133600
, also known as HIP 73815, is a G-type star in the constellation of Virgo.〔 It has an apparent visual magnitude of approximately 8.219.〔 It is very similar to the Sun and has been called a solar twin.〔Accurate abundance patterns of solar twins and analogs. Does the anomalous solar chemical composition come from planet formation?, I. Ramírez, J. Meléndez, and M. Asplund, ''Astronomy and Astrophysics'' 508, #1 (December 2009), , .〕
Its distance is 52.3 parsecs. Mass is within 3 percent of the Sun.〔(HIP 56948: A SOLAR TWIN WITH A LOW LITHIUM ABUNDANCE ) , Jorge Melendez and Ivan Ramırezd, ''The Astrophysical Journal'', 669: L89–L92, 2007 November 10. (also discusses HIP 73815, compares it with HIP 56948)〕
Solar twins can help us to understand solar activity such as flares and sunspot cycles over longer time periods than the historical records, and to put unique historical events such as the Maunder minimum in context. They can also be used to set the zero point of fundamental calibrations in astrophysics, and models of solar evolution.〔
Solar twins can also help answer whether the Sun is unique or not. It used to be thought that the Sun might be unique for its low lithium abundance. This star was one of two stars that were used in 2007 papers by Melendez & Ramırez.〔 To show that the Sun was not unique in this respect as it has lithium abundance similar to our Sun. This has made it a useful star for studies into the problem of the depleted lithium abundance at the solar surface compared with other stars, something that is not yet fully understood, and known as the Lithium depletion problem.
==References==
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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