Английская Википедия:HR 7578

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HR 7578 (also known as V4200 Sagittarii) is a binary star in the constellation of Sagittarius. Their combined apparent magnitude is 6.18.[1] Parallax measurements by the Gaia spacecraft put the system at 46.01 light-years (14.107 parsecs) away, making this a nearby system.[2]

The two stars of HR 7578 are fairly old, older than the Pleiades but possibly younger than the Hyades.[3] The stars are between Шаблон:Val and Шаблон:Val years old.[3] Both are K-type main-sequence stars.[4] Both stars have a minimum mass of Шаблон:Solar mass, and are unusually metal-rich, showing high amounts of cyanide and sodium in their spectra.[3]

HR 7578 is a BY Draconis variable. This is a class of variable star whose variability comes from starspots on the stars' surfaces. HR 7578 also has a common proper motion companion, 2MASS J19542064−2356398. It is a red dwarf that is at least 580 astronomical units from the central star system.[1]

References

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Шаблон:Stars of Sagittarius

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