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Y Sagittarii : ウィキペディア英語版 | Y Sagittarii
Y Sagittarii is a variable star in the constellation of Sagittarius . It is a Cepheid variable in apparent magnitude +5.77. This star is the third brightest in this constellation after X Sagittarii and W Sagittarii . The measure of its parallax by Hubble Space Telescope puts Y Sagittarii to 1293 light years away from the Solar System . == Properties == The brightness ranges in Y Sagittarii's apparent magnitude varies from +5.25 and +6.24 in a period of 5.7736 days. The spectral type of this star is F8II, while the effective temperature is 5370 K. It has a radius 50 times larger than the Sun, its projected rotational velocity of 16 km / s and has an estimated mass six times that of the Sun . The star's metal content is similar to Sun, with an index of metallicity (/ H ) = +0.05. For other metals tested, shows some overabundance of copper, zinc, yttrium and sodium, the level of the elements is almost double that of the Sun ((/ H ) = +0.27).〔
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