31 Cygni (original) (raw)
Omicron1 Cygni, appelée également 31 Cygni ou V695 Cygni, est une étoile de la constellation du Cygne. C'est une binaire à éclipses de type Algol, sa luminosité varie entre les magnitudes 3,73 et 3,89 sur une période de dix ans ; les deux composantes sont une supergéante orange de type spectral K4Iab et une étoile bleue-blanche probablement en train de quitter la séquence principale avec un type spectral B4IV-V.
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| dbo:abstract | 31 Cygni, also known as ο1 Cygni, Omicron1 Cygni, or V695 Cygni, is a triple star system about 750 light years away in the constellation Cygnus. The Bayer designation ο (omicron) has been variously applied to two or three of the stars 30, 31, and 32 Cygni. 31 Cygni has been designated, variously, as ο1 or ο2 Cygni — therefore for clarity, it is preferred to use the Flamsteed designation 31 Cygni. 31 Cygni consists of a visible pair of stars 109″ apart as of 2016, and the brighter of the two is also a spectroscopic binary. 31 Cygni A is also designated HD 192577 and HR 7735, while its 7th-magnitude visual companion is designated HD 192579. Some multiple star catalogues designate a 13th-magnitude star 36″ from 31 Cygni A as 31 Cygni B, and HD 192579 as 31 Cygni C. The 13th-magnitude star is likely to be an unrelated background object. The spectroscopic pair are an orange supergiant of spectral type K3Ib and a blue-white star likely to be evolving off the main sequence with a spectral type of B2IV-V. The visible companion is a 7th-magnitude B5 main sequence star. 31 Cygni A is an Algol-type eclipsing binary and ranges between magnitudes 3.73 and 3.89 over a period of ten years. The eclipsing system has been studied in attempts to determine an accurate direct mass for a red supergiant. The value 6.73 M☉ is believed to be accurate to about 2%, but there are some discrepancies in the orbital fit. 30 Cygni is another naked eye star a tenth of a degree away, forming a bright triple. 32 Cygni is about a degree away to the north, also a detached eclipsing binary system. It comprises a large cool evolved star and a small hot main sequence or subgiant companion. (en) Ómicron1 Cygni (ο1 Cyg / 31 Cygni / V695 Cygni) es una estrella variable en la constelación del Cisne de magnitud aparente media +3,79. Comparte la denominación de Bayer «Ómicron» con ο2 Cygni, si bien no existe relación física entre las dos estrellas. Ómicron1 Cygni se encuentra probablemente a unos 600 años luz de distancia del Sistema Solar. Al igual que Almaaz (ε Aurigae), Ómicron1 Cygni es una binaria eclipsante amplia, compuesta por una gigante luminosa naranja de tipo espectral K2II y una estrella azul de la secuencia principal de tipo B3V. Las dos estrellas están separadas unas 11 UA. Cada 10,36 años la estrella gigante eclipsa parcialmente a su compañera, produciendo una disminución de brillo de una décima de magnitud; la duración del eclipse es de 63 días. El paso de la estrella azul por delante de la gigante naranja no es apreciable. La temperatura superficial de la gigante naranja es de aproximadamente 3900 K. Su luminosidad es 1800 veces mayor que la luminosidad solar, siendo su radio entre 100 y 120 veces más grande que el radio solar, lo que equivale a poco más de 0,5 UA. La gigante luminosa tiene una masa entre 4 y 6 masas solares, mientras que la estrella azul tiene un masa entre 6 y 7 masas solares. Dado que las estrellas más masivas evolucionan antes y la gigante naranja está claramente más evolucionada que su compañera, su menor masa actual se debe a una severa pérdida de masa estelar a lo largo de su historia. (es) Omicron1 Cygni, appelée également 31 Cygni ou V695 Cygni, est une étoile de la constellation du Cygne. C'est une binaire à éclipses de type Algol, sa luminosité varie entre les magnitudes 3,73 et 3,89 sur une période de dix ans ; les deux composantes sont une supergéante orange de type spectral K4Iab et une étoile bleue-blanche probablement en train de quitter la séquence principale avec un type spectral B4IV-V. (fr) Omicron1 Cygni (ο1 Cygni, ο1 Cyg/31 Cygni, 31 Cyg/V695 Cygni) è un sistema stellare della costellazione del Cigno distante circa 600 anni luce dal sistema solare. (it) Omikron1 Cygni eller 31 Cygni, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Svanen, som också har Bayer-beteckningen o1 Cygni och variabelbeteckningen V695 Cygni. Den har en genomsnittlig skenbar magnitud på ca 3,80 och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 4,3 mas, beräknas den befinna sig på ett avstånd på ca 750 ljusår (ca 230 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -7,5 km/s. Bayer-beteckningen Omicron Cygni har i olika sammanhang applicerats på två eller tre av stjärnorna 30, 31 och 32 Cygni. För tydlighetens skull är det att föredra att använda Flamsteed-beteckningen 31 Cygni snarare än en av Bayer-beteckningarna. (sv) Omicron1 Cygni (31 Cygni) é uma estrela na direção da constelação de Cygnus. Possui uma ascensão reta de 20h 13m 37.90s e uma declinação de +46° 44′ 28.8″. Sua magnitude aparente é igual a 3.80. Considerando sua distância de 1353 anos-luz em relação à Terra, sua magnitude absoluta é igual a −4.29. Pertence à classe espectral K2II+.... É uma estrela variável algol. (pt) 天鵝座31(天鵝座ο1)，又名BD+46 2882，HD 192577、SAO 49337、HR 7735，是天鵝座的一颗恒星，视星等为3.79，位于銀經82.68，銀緯6.78，其B1900.0坐标为赤經20h 10m 28.9s，赤緯+46° 6.78′ 16″。 (zh) |
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| dbp:names | V695 Cyg, HD 192577, BD+46°2882, HIP 99675, HR 7735, SAO 49337 (en) ο1 Cyg, ο2 Cyg, 31 Cyg, ADS 13554, WDS J20136+4644 (en) HD 192579, BD+46°2883, HIP 99676, SAO 49338 (en) |
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| rdfs:comment | Omicron1 Cygni, appelée également 31 Cygni ou V695 Cygni, est une étoile de la constellation du Cygne. C'est une binaire à éclipses de type Algol, sa luminosité varie entre les magnitudes 3,73 et 3,89 sur une période de dix ans ; les deux composantes sont une supergéante orange de type spectral K4Iab et une étoile bleue-blanche probablement en train de quitter la séquence principale avec un type spectral B4IV-V. (fr) Omicron1 Cygni (ο1 Cygni, ο1 Cyg/31 Cygni, 31 Cyg/V695 Cygni) è un sistema stellare della costellazione del Cigno distante circa 600 anni luce dal sistema solare. (it) Omicron1 Cygni (31 Cygni) é uma estrela na direção da constelação de Cygnus. Possui uma ascensão reta de 20h 13m 37.90s e uma declinação de +46° 44′ 28.8″. Sua magnitude aparente é igual a 3.80. Considerando sua distância de 1353 anos-luz em relação à Terra, sua magnitude absoluta é igual a −4.29. Pertence à classe espectral K2II+.... É uma estrela variável algol. (pt) 天鵝座31(天鵝座ο1)，又名BD+46 2882，HD 192577、SAO 49337、HR 7735，是天鵝座的一颗恒星，视星等为3.79，位于銀經82.68，銀緯6.78，其B1900.0坐标为赤經20h 10m 28.9s，赤緯+46° 6.78′ 16″。 (zh) 31 Cygni, also known as ο1 Cygni, Omicron1 Cygni, or V695 Cygni, is a triple star system about 750 light years away in the constellation Cygnus. The Bayer designation ο (omicron) has been variously applied to two or three of the stars 30, 31, and 32 Cygni. 31 Cygni has been designated, variously, as ο1 or ο2 Cygni — therefore for clarity, it is preferred to use the Flamsteed designation 31 Cygni. 30 Cygni is another naked eye star a tenth of a degree away, forming a bright triple. (en) Ómicron1 Cygni (ο1 Cyg / 31 Cygni / V695 Cygni) es una estrella variable en la constelación del Cisne de magnitud aparente media +3,79. Comparte la denominación de Bayer «Ómicron» con ο2 Cygni, si bien no existe relación física entre las dos estrellas. Ómicron1 Cygni se encuentra probablemente a unos 600 años luz de distancia del Sistema Solar. (es) Omikron1 Cygni eller 31 Cygni, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Svanen, som också har Bayer-beteckningen o1 Cygni och variabelbeteckningen V695 Cygni. Den har en genomsnittlig skenbar magnitud på ca 3,80 och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 4,3 mas, beräknas den befinna sig på ett avstånd på ca 750 ljusår (ca 230 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -7,5 km/s. (sv) |
| rdfs:label | 31 Cygni (en) Ómicron1 Cygni (es) Omicron1 Cygni (it) Omicron1 Cygni (fr) Omicron1 Cygni (pt) 31 Cygni (sv) 天鵝座31 (zh) |
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