The Universe is vast, encompassing hundreds of billions of galaxies. For those galaxies close to us, we primarily determine their distances using classical Cepheids and RR Lyrae (RR Lyr) stars. RR Lyr stars are pulsating variables that shine 100 times more brightly than our Sun and are more than
Astronomers have suggested using double-period RR Lyr stars to accurately measure galaxy distances. This method, which can increase the sample of galaxies with precise distances by over 20 times, eliminates the need for spectroscopic observations. Above is a 3D intuitive map of the Local Group. Credit: NAOC
RR Lyr stars are pulsating variables that shine 100 times more brightly than our Sun and are more than twice as old. They can be used as a standard candle for measuring the distances of galaxies, due to the tight relationship between their pulsation period and luminosity at the same elemental abundance. proposed using double-period RR Lyr stars to measure the distances of galaxies, with the distance error of galaxies being optimized to 1-2%.
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