8_Draconis
8 Draconis
White-hued chemically unusual star in the constellation Draco
8 Draconis, formally named Taiyi /ˌtaɪˈjiː/,[11] is a single[12] star in the northern circumpolar constellation of Draco. Based upon an annual parallax shift of 34.14 mas as seen from the Earth,[13] the star is located approximately 96 light-years from the Sun. It is moving further away with a heliocentric radial velocity of +9 km/s,[7] having come within 40.6 ly some 2.6 million years ago.[5]
This is an F-type main-sequence star with a stellar classification of F1VmA7(n).[4] It is a Gamma Doradus variable star with a brightness variation of about one tenth of a magnitude.[6] 8 Dra has a relatively high rate of rotation, showing a projected rotational velocity of 120 km/s.[9] The star has 1.56 times the mass of the Sun and 1.50 times the Sun's radius.[8] It is radiating 5.75[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,129 K.[4] An infrared excess has been detected at wavelengths of 24 and 70μm, which suggests the presence of a circumstellar disk orbiting the star.[8]