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砺石三，即金牛座χ（χ Tau，χ Tauri）是一对位于金牛座的双星，距离地球约268光年。 砺石三由一个分光双星系统组成，主星砺石三A是一颗蓝白色B-型主序星，视星等为+5.38。伴星砺石三B是一颗视星等为+7.6的黄色G-型主序星，距离主星19角秒。 在中国古代星官系统中，它属于西方白虎七宿中昴宿的星官第三星，这也是砺石三名字的来由。
, Chi Tauri (χ Tauri, förkortat Chi Tau, χ T … Chi Tauri (χ Tauri, förkortat Chi Tau, χ Tau) som är stjärnans Bayerbeteckning, är en dubbelstjärna belägen i den norra delen av stjärnbilden Oxen. Den har en skenbar magnitud på 5,38 och är synlig för blotta ögat. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 11,2 mas, beräknas den befinna sig på ett avstånd av ca 291 ljusår (89 parsek) från solen.d av ca 291 ljusår (89 parsek) från solen.
, Chi Tauri (59 Tauri) é uma estrela na dire … Chi Tauri (59 Tauri) é uma estrela na direção da constelação de Taurus. Possui uma ascensão reta de 04h 22m 34.93s e uma declinação de +25° 37′ 45.7″. Sua magnitude aparente é igual a 5.38. Considerando sua distância de 267 anos-luz em relação à Terra, sua magnitude absoluta é igual a 0.81. Pertence à classe espectral B9V.l a 0.81. Pertence à classe espectral B9V.
, Chi Tauri (χ Tauri / χ Tau o 59 Tauri) è u … Chi Tauri (χ Tauri / χ Tau o 59 Tauri) è una stella della costellazione del Toro. Di magnitudine 5,3, dista approssimativamente 268 anni luce dalla Terra. In realtà si tratta di una binaria visuale formata da una stella blu e da una secondaria separata di 19 secondi d'arco che è, ad una più attenta analisi, una binaria spettroscopica. La stella principale è una stella bianco-azzurra di sequenza principale di magnitudine + 5,38 e con massa 2,65 volte quella del Sole, ed una temperatura superficiale di 10 400 K. La secondaria è una binaria spettroscopica composta da due stelle leggermente più massicce del Sole che orbitano attorno al comune centro di massa con un periodo di 17,6 giorni; la separazione media è stimata essere pari a 6,96 UA. Le due componenti sono di tipo spettrale F8 e G6. Studi sui modelli orbitali delle componenti di Chi Tauri B suggeriscono comunque che il sistema sia composto da altre due componenti di massa pari a 0,7 masse solari ciascuna; in definitiva si può considerare Chi Tauri un sistema quintuplo.onsiderare Chi Tauri un sistema quintuplo.
, Chi Tauri, Latinised from χ Tauri, is a st … Chi Tauri, Latinised from χ Tauri, is a star system in the constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 291 light-years (89 parsecs) from Earth. The primary component has an apparent magnitude of about 5.4, meaning it is visible with the naked eye. The main component of the system is Chi Tauri A. It is a B-type main-sequence star. Its mass is 2.6 times that of the Sun and its surface glows with an effective temperature of 10,300 K. It may be a binary star itself, as suggested from astrometric data from Hipparcos, although no orbit could be derived. The secondary component of the system is Chi Tauri B, separated about 19″ from Chi Tauri A. It was thought to be a post-T Tauri star from its unusual spectrum, but later studies ruled this out. It is a double-lined spectroscopic binary—the two stars are not resolved but their spectra have periodic Doppler shifts indicating orbital motion. The two stars are an F-type star and a G-type star, respectively, and are designated Ba and Bb. The radial velocity of Chi Tauri B has a slow drift indicating the presence of another star in the system. Designated Chi Tauri Bc, this massive object is too dim to be detected, but it appears in Chi Tauri B's spectrum as an infrared excess. Because of this infrared excess, this unseen component is thought to be a pair of K-type main-sequence stars both with masses 70% of the Sun's. The stars within the system appear to be dynamically interacting.stem appear to be dynamically interacting.
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砺石三，即金牛座χ（χ Tau，χ Tauri）是一对位于金牛座的双星，距离地球约268光年。 砺石三由一个分光双星系统组成，主星砺石三A是一颗蓝白色B-型主序星，视星等为+5.38。伴星砺石三B是一颗视星等为+7.6的黄色G-型主序星，距离主星19角秒。 在中国古代星官系统中，它属于西方白虎七宿中昴宿的星官第三星，这也是砺石三名字的来由。
, Chi Tauri (χ Tauri / χ Tau o 59 Tauri) è u … Chi Tauri (χ Tauri / χ Tau o 59 Tauri) è una stella della costellazione del Toro. Di magnitudine 5,3, dista approssimativamente 268 anni luce dalla Terra. In realtà si tratta di una binaria visuale formata da una stella blu e da una secondaria separata di 19 secondi d'arco che è, ad una più attenta analisi, una binaria spettroscopica. La stella principale è una stella bianco-azzurra di sequenza principale di magnitudine + 5,38 e con massa 2,65 volte quella del Sole, ed una temperatura superficiale di 10 400 K. una temperatura superficiale di 10 400 K.
, Chi Tauri, Latinised from χ Tauri, is a st … Chi Tauri, Latinised from χ Tauri, is a star system in the constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 291 light-years (89 parsecs) from Earth. The primary component has an apparent magnitude of about 5.4, meaning it is visible with the naked eye. meaning it is visible with the naked eye.
, Chi Tauri (χ Tauri, förkortat Chi Tau, χ T … Chi Tauri (χ Tauri, förkortat Chi Tau, χ Tau) som är stjärnans Bayerbeteckning, är en dubbelstjärna belägen i den norra delen av stjärnbilden Oxen. Den har en skenbar magnitud på 5,38 och är synlig för blotta ögat. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 11,2 mas, beräknas den befinna sig på ett avstånd av ca 291 ljusår (89 parsek) från solen.d av ca 291 ljusår (89 parsek) från solen.
, Chi Tauri (59 Tauri) é uma estrela na dire … Chi Tauri (59 Tauri) é uma estrela na direção da constelação de Taurus. Possui uma ascensão reta de 04h 22m 34.93s e uma declinação de +25° 37′ 45.7″. Sua magnitude aparente é igual a 5.38. Considerando sua distância de 267 anos-luz em relação à Terra, sua magnitude absoluta é igual a 0.81. Pertence à classe espectral B9V.l a 0.81. Pertence à classe espectral B9V.
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砺石三
, Chi Tauri
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