About: V476 Cygni

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V476 Cygni or Nova Cygni 1920 was a nova which occurred in the constellation Cygnus in 1920. It was discovered by William Frederick Denning, an English amateur astronomer, at 09:30 GMT on 20 August 1920, at which time it had a magnitude of 3.7. It reached a peak brightness of magnitude 1.7 on 23 August 1920. Its quiescent brightness is magnitude 17.09.

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  • V476 Cygni war eine Nova, die 1920 im Sternbild Schwan erschien und eine Helligkeit von 2,0 mag erreichte. Heute ist V476 Cygni 17,09 mag hell. (de)
  • V476 Cygni o Nova Cygni 1920 es una nova aparecida en la constelación de Cygnus en 1920.​ Fue vista por primera vez el 22 de agosto de ese año y alcanzó un brillo de magnitud aproximada de 1.9 la noche siguiente, para caer hasta 3.8 luego de 7 días, durante los cuales se la observaba a simple vista. En los primero dos meses de observaciones declinó cerca de 7 magnitudes, siendo esta declinación mayor que la de Nova Persei 1901, que se redujo 5.1 órdenes en igual periodo.​ El espectro fue clasificado como A2. A partir de las líneas H y K del espectro de absorción de la nova se determinó su velocidad radial en 18 km.​ (es)
  • V476 Cygni (ou Nova Cygni 1920) était une nova qui survint en 1920 dans la constellation du Cygne. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 2,0. Actuellement, V476 Cygni a une magnitude de 17,09. (fr)
  • V476 Cygni or Nova Cygni 1920 was a nova which occurred in the constellation Cygnus in 1920. It was discovered by William Frederick Denning, an English amateur astronomer, at 09:30 GMT on 20 August 1920, at which time it had a magnitude of 3.7. It reached a peak brightness of magnitude 1.7 on 23 August 1920. Its quiescent brightness is magnitude 17.09. V476 Cygni's light curve is quite unusual, showing a rapid decline from maximum brightness, followed by a slow nearly linear fading. It is classified as a very fast nova, with a very long tail. The light curve shows a "dust dip", a fast decline to a local brightness minimum, then a small increase in brightness, and finally a long, slow decline. This dust dip is believed to is believed to coincide with the formation of dust in the material ejected from the nova as it moves away from the star and cools. All novae consist of a close binary star pair, with a white dwarf star and a "donor" star orbiting each other. The stars are so close together that the less dense donor star transfers matter to the white dwarf. In the case of V476 Cygni, modeling indicates that the white dwarf has a mass of 1.18M⊙, and it is receiving 6×10−10 M⊙ of material from the donor star, per year. V476 Cygni has transitioned into a recurrent dwarf nova, although it has done so much earlier than expected. A small emission nebula (shell) is visible around the star, which resembles a planetary nebula. Santamaria et al. examined images of the nebula taken in 1944, 1993 and 2018 and found that the shell is clearly expanding. It is slightly elliptical, with major and minor axes of 14.6×13.4 arc seconds (as of 2018) expanding at a rate of 0.073×0.067 arc seconds per year, implying a physical expansion rate of 230×200 km/sec. Surprisingly, a 1997 attempt to image the shell using the Hubble Space Telescope, was unsuccessful. (en)
  • V476 Cygni eller Nova Cygni 1920 var en nova i stjärnbilden Svanen. Novan upptäcktes den 24 augusti 1920 av den flitige brittiske amatörastronomen William Frederick Denning V 476 Cygni nådde magnitud +1,9 i maximum och avklingade sedan snabbt. Stjärnan är numera av magnitud 17,1. (sv)
  • 天鵝座V476或1920天鵝座新星是1920年現在天鵝座的一顆新星。它是由英國業餘天文學家威廉·弗雷德里克·丹寧於1920年8月20日09:30格林威治標準時間發現的,當時它的亮度為3.7等。它在1920年8月23日達到了1.7等的峰值亮度。它的靜態亮度為17.09等。 天鵝座V476的光變曲線非常不尋常,顯示出從最大亮度迅速下降,隨後緩慢的近乎線性的衰減。它被歸類為非常快的新星,但尾巴很長。光變曲線呈現出「塵埃蛻降」,快速下降到局部亮度最小值,然後亮度小幅增加,最後是漫長而緩慢的下降。據信,這種塵埃蛻降與從新星中噴射出來物質,因為它遠離恆星並冷卻形成塵埃的過程相吻合。 所有新星都由一對緊密的雙星組成,一顆白矮星和一顆"施主"恆星相互圍繞著旋轉。這兩顆恆星之間的距離如此貼近,以至於密度較低的供體恆星向白矮星轉移了物質。在天鵝座V476的情況下,建立的模型表明白矮星的質量為1.18,並且它每年從供體恆星接收6×10−10 M⊙物質。而且天鵝座V476比預期的要早得多,已經轉變為一顆復發的矮新星。 在恆星周圍可以看到一個類似於行星狀星雲的小發射星雲(殼)。聖瑪麗亞(Santamaria)等人檢查了1944年,1993年和2018年拍攝的星雲圖像,發現殼體顯然正在膨脹。它略呈橢圓形,長軸和短軸為14.6×13.4弧秒(截至2018年),以每年0.073×0.067弧秒的速度膨脹,這意味著物實際的膨脹率為230×200 km/sec。令人驚訝的是,1997年使用哈伯太空望遠鏡對外殼進行成像的嘗試沒有成功。 (zh)
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  • V476 Cygni war eine Nova, die 1920 im Sternbild Schwan erschien und eine Helligkeit von 2,0 mag erreichte. Heute ist V476 Cygni 17,09 mag hell. (de)
  • V476 Cygni (ou Nova Cygni 1920) était une nova qui survint en 1920 dans la constellation du Cygne. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 2,0. Actuellement, V476 Cygni a une magnitude de 17,09. (fr)
  • V476 Cygni eller Nova Cygni 1920 var en nova i stjärnbilden Svanen. Novan upptäcktes den 24 augusti 1920 av den flitige brittiske amatörastronomen William Frederick Denning V 476 Cygni nådde magnitud +1,9 i maximum och avklingade sedan snabbt. Stjärnan är numera av magnitud 17,1. (sv)
  • V476 Cygni o Nova Cygni 1920 es una nova aparecida en la constelación de Cygnus en 1920.​ Fue vista por primera vez el 22 de agosto de ese año y alcanzó un brillo de magnitud aproximada de 1.9 la noche siguiente, para caer hasta 3.8 luego de 7 días, durante los cuales se la observaba a simple vista. En los primero dos meses de observaciones declinó cerca de 7 magnitudes, siendo esta declinación mayor que la de Nova Persei 1901, que se redujo 5.1 órdenes en igual periodo.​ (es)
  • V476 Cygni or Nova Cygni 1920 was a nova which occurred in the constellation Cygnus in 1920. It was discovered by William Frederick Denning, an English amateur astronomer, at 09:30 GMT on 20 August 1920, at which time it had a magnitude of 3.7. It reached a peak brightness of magnitude 1.7 on 23 August 1920. Its quiescent brightness is magnitude 17.09. (en)
  • 天鵝座V476或1920天鵝座新星是1920年現在天鵝座的一顆新星。它是由英國業餘天文學家威廉·弗雷德里克·丹寧於1920年8月20日09:30格林威治標準時間發現的,當時它的亮度為3.7等。它在1920年8月23日達到了1.7等的峰值亮度。它的靜態亮度為17.09等。 天鵝座V476的光變曲線非常不尋常,顯示出從最大亮度迅速下降,隨後緩慢的近乎線性的衰減。它被歸類為非常快的新星,但尾巴很長。光變曲線呈現出「塵埃蛻降」,快速下降到局部亮度最小值,然後亮度小幅增加,最後是漫長而緩慢的下降。據信,這種塵埃蛻降與從新星中噴射出來物質,因為它遠離恆星並冷卻形成塵埃的過程相吻合。 所有新星都由一對緊密的雙星組成,一顆白矮星和一顆"施主"恆星相互圍繞著旋轉。這兩顆恆星之間的距離如此貼近,以至於密度較低的供體恆星向白矮星轉移了物質。在天鵝座V476的情況下,建立的模型表明白矮星的質量為1.18,並且它每年從供體恆星接收6×10−10 M⊙物質。而且天鵝座V476比預期的要早得多,已經轉變為一顆復發的矮新星。 (zh)
rdfs:label
  • V476 Cygni (de)
  • Nova Cygni 1920 (es)
  • V476 Cygni (fr)
  • V476 Cygni (en)
  • V476 Cygni (sv)
  • 天鹅座V476 (zh)
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