A visual binary is a gravitationally bound binary star system that can be resolved into two stars. These stars are estimated, via Kepler's third law, to have periods ranging from a few years to thousands of years. A visual binary consists of two stars, usually of a different brightness. Because of this, the brighter star is called the primary and the fainter one is called the companion. If the primary is too bright, relative to the companion, this can cause a glare making it difficult to resolve the two components. However, it is possible to resolve the system if observations of the brighter star show it to wobble about a centre of mass. In general, a visual binary can be resolved into two stars with a telescope if their centres are separated by a value greater than or equal to one arcseco
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| rdfs:label
| - Binaire visuelle (fr)
- Binaria visuale (it)
- Visuele dubbelster (nl)
- Visual binary (en)
- 目視聯星 (zh)
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| - Une étoile double visuelle est un couple d'étoiles proches sur le ciel dont les deux composantes peuvent être observées séparément avec un instrument comme un télescope, et cette définition dépend donc en particulier du pouvoir de résolution de l'instrument. Parmi celles-ci, les binaires visuelles sont celles dont la propriété d'étoile binaire est révélée en général par le mouvement orbital relatif de la secondaire autour de la primaire. (fr)
- 目視聯星是受到引力束縛，並且可以分解成兩顆星的聯星系統。根據克卜勒第三定律，這些恆星的週期從幾年到幾千年不等。目視聯星由兩顆恆星組成，而且通常兩者有不同的亮度。因此，較亮的那一顆恆星稱為主星，較暗的恆星稱為伴星。如果主星相對於伴星過於明亮，則會導致眩光，從而難以分辨出是兩顆恆星。然而，如果對較亮恆星的觀測顯示它圍繞質心擺動，就有可能分辨出這個系統。一般而言，如果一對聯星之間的距離大於1弧秒，那麼就可以用望遠鏡將其分辨出是兩顆恆星。但用現代的專業望遠鏡、干涉儀或天基設備(太空望遠鏡)，可以分辨出距離更近的聯星。 對於一對目視可見的聯星系統，測量值需要以弧秒為單位來組織兩者在天空中的視角間隔和位置角，即從北向東量測的伴星相對於主星的角度。在一段時間內，目視聯星系統的視相對軌道將出現在天球上。對目視聯星的研究揭露了許多有用的恆星特徵：質量、密度、表面溫度、光度和旋轉速率。 (zh)
- A visual binary is a gravitationally bound binary star system that can be resolved into two stars. These stars are estimated, via Kepler's third law, to have periods ranging from a few years to thousands of years. A visual binary consists of two stars, usually of a different brightness. Because of this, the brighter star is called the primary and the fainter one is called the companion. If the primary is too bright, relative to the companion, this can cause a glare making it difficult to resolve the two components. However, it is possible to resolve the system if observations of the brighter star show it to wobble about a centre of mass. In general, a visual binary can be resolved into two stars with a telescope if their centres are separated by a value greater than or equal to one arcseco (en)
- In astronomia, una binaria visuale è una stella binaria che è visibile come tale ad occhio nudo o con un telescopio. La maggior parte delle stelle binarie non sono visuali, perché troppo vicine tra loro o troppo distanti dalla Terra. In entrambi i casi le immagini delle due stelle si confondono in una sola e per rivelare la loro natura binaria occorre utilizzare altre tecniche, come per esempio la spettroscopia. Le binarie visuali sono quindi stelle relativamente vicine a noi e non troppo legate tra loro. Sono molto apprezzate dagli astrofili per la loro spettacolarità nella visione al telescopio. (it)
- Een visuele dubbelster is een dubbelster waarvan de leden met een telescoop apart te zien zijn, in tegenstelling tot de leden van een spectroscopische dubbelster. In het algemeen staan de leden van een visuele dubbelster verder van elkaar vandaan dan de leden van een spectroscopische dubbelster. Van veel visuele dubbelsterren staan de leden slechts schijnbaar vlak bij elkaar, in werkelijkheid staat de ene ster veel verder weg dan de andere. (nl)
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| - Une étoile double visuelle est un couple d'étoiles proches sur le ciel dont les deux composantes peuvent être observées séparément avec un instrument comme un télescope, et cette définition dépend donc en particulier du pouvoir de résolution de l'instrument. Parmi celles-ci, les binaires visuelles sont celles dont la propriété d'étoile binaire est révélée en général par le mouvement orbital relatif de la secondaire autour de la primaire. (fr)
- A visual binary is a gravitationally bound binary star system that can be resolved into two stars. These stars are estimated, via Kepler's third law, to have periods ranging from a few years to thousands of years. A visual binary consists of two stars, usually of a different brightness. Because of this, the brighter star is called the primary and the fainter one is called the companion. If the primary is too bright, relative to the companion, this can cause a glare making it difficult to resolve the two components. However, it is possible to resolve the system if observations of the brighter star show it to wobble about a centre of mass. In general, a visual binary can be resolved into two stars with a telescope if their centres are separated by a value greater than or equal to one arcsecond, but with modern professional telescopes, interferometry, or space-based equipment, stars can be resolved at closer distances. For a visual binary system, measurements taken need to specify, in arc-seconds, the apparent angular separation on the sky and the position angle – which is the angle measured eastward from North in degrees – of the companion star relative to the primary star. Taken over a period of time, the apparent relative orbit of the visual binary system will appear on the celestial sphere. The study of visual binaries reveal useful stellar characteristics: Masses, densities, surface temperatures, luminosity, and rotation rates. (en)
- Een visuele dubbelster is een dubbelster waarvan de leden met een telescoop apart te zien zijn, in tegenstelling tot de leden van een spectroscopische dubbelster. In het algemeen staan de leden van een visuele dubbelster verder van elkaar vandaan dan de leden van een spectroscopische dubbelster. Van veel visuele dubbelsterren staan de leden slechts schijnbaar vlak bij elkaar, in werkelijkheid staat de ene ster veel verder weg dan de andere. Welke dubbelsterren nog met een telescoop te scheiden zijn hangt af van het scheidend vermogen van de telescoop. Bepaalde dubbelsterren die vandaag nog alleen spectroscopische zijn zullen visuele dubbelsterren kunnen worden als de ontwikkelingen in telescooptechnologie verder gaan. EBLM J0555-57 is een visuele dubbelster, maar EBLM J0555-57A heeft nog een rode dwerg om zich heen cirkelen (57Ab), waardoor die twee weer een spectroscopische dubbelster zijn. (nl)
- In astronomia, una binaria visuale è una stella binaria che è visibile come tale ad occhio nudo o con un telescopio. La maggior parte delle stelle binarie non sono visuali, perché troppo vicine tra loro o troppo distanti dalla Terra. In entrambi i casi le immagini delle due stelle si confondono in una sola e per rivelare la loro natura binaria occorre utilizzare altre tecniche, come per esempio la spettroscopia. Le binarie visuali sono quindi stelle relativamente vicine a noi e non troppo legate tra loro. Sono molto apprezzate dagli astrofili per la loro spettacolarità nella visione al telescopio. Un esempio di binaria visuale visibile ad occhio nudo è Mizar, nella costellazione dell'Orsa Maggiore. (it)
- 目視聯星是受到引力束縛，並且可以分解成兩顆星的聯星系統。根據克卜勒第三定律，這些恆星的週期從幾年到幾千年不等。目視聯星由兩顆恆星組成，而且通常兩者有不同的亮度。因此，較亮的那一顆恆星稱為主星，較暗的恆星稱為伴星。如果主星相對於伴星過於明亮，則會導致眩光，從而難以分辨出是兩顆恆星。然而，如果對較亮恆星的觀測顯示它圍繞質心擺動，就有可能分辨出這個系統。一般而言，如果一對聯星之間的距離大於1弧秒，那麼就可以用望遠鏡將其分辨出是兩顆恆星。但用現代的專業望遠鏡、干涉儀或天基設備(太空望遠鏡)，可以分辨出距離更近的聯星。 對於一對目視可見的聯星系統，測量值需要以弧秒為單位來組織兩者在天空中的視角間隔和位置角，即從北向東量測的伴星相對於主星的角度。在一段時間內，目視聯星系統的視相對軌道將出現在天球上。對目視聯星的研究揭露了許多有用的恆星特徵：質量、密度、表面溫度、光度和旋轉速率。 (zh)
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