Xi Geminorum (ξ Gem) is a star in the zodiac constellation Gemini with the traditional name Alzirr. It forms one of the four feet of the outline demarcating the Gemini twins. The star has an apparent visual magnitude of 3.35, which is bright enough for it to be seen with the naked eye. From parallax measurements, its distance from the Earth can be estimated as 58.7 light-years (18.0 parsecs).
Alzirr has a stellar classification of F5 IV, which is subgiant star that is in the process of evolving away from the main sequence of stars like the Sun. It has about 162% of the Sun's mass and is radiating more than 11 times the luminosity of the Sun. This energy is being emitted from the outer envelope of the star at an effective temperature of 6,464 K. This causes the star to take on the yellow-white hue common to F-type stars.
X-ray emission has been detected from this star, which has an estimated X-ray luminosity of 1.06 × 1029 erg s–1. It has the spectroscopic signature of a rapidly rotating star, with a projected rotational velocity of about 66 km s–1. Although generally considered a single star, there is some evidence that it may instead be a spectroscopic binary system consisting of two component stars of equal mass.
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Other articles related to "xi geminorum, geminorum, xi":
... The proper name of Xi Geminorum is Alzirr, meaning "the button" in Arabic ... Well (asterism), refers to an asterism consisting of ξ Geminorum, μ Geminorum, ν Geminorum, γ Geminorum, ε Geminorum, 36 Geminorum, ζ Geminorum and λ Geminorum ... Consequently, ξ Geminorum itself is known as 井宿四 (Jǐng Su sì, English the Fourth Star of Well.) ...
... graffias means "claws" and was also applied to Xi Scorpii and to Alpha Librae Crux α Crucis Acrux "Acrux" is a modern contraction of the Bayer designation Cancer α Cancri ... Corvi Algorab Auriga α Aurigae Alhajoth Gemini γ Geminorum Alhena Ursa Major ε Ursae Majoris Alioth Ursa Major η Ursae Majoris Alkaid Columba ... 牵牛星 (Qiān Niú Xīng) or 牛郎星 ( Niú Láng Xīng), "Cow Herder Star" of the Qi Xi love story ...