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RZ Gruis is a nova-like binary system in the constellation Grus composed of a white dwarf and an F-type main-sequence star. It is generally of apparent magnitude of 12.3 with occasional dimming to 13.4. Its components are thought to orbit each other roughly every 8.5 to 10 hours (much longer than most nova-like variables, which have periods of around 3 to 4 hours). It belongs to the UX Ursae Majoris subgroup of cataclysmic variable star systems, where material from the donor star is drawn to the white dwarf where it forms an accretion disc that remains bright and outshines the two component stars. The system is around 1,434 light-years away from Earth; or as much as just over 1,770 if Gaia, usually less calibrated, raw data is preferred.

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rdf:type
rdfs:label
  • RZ de la Grua (ca)
  • RZ Gruis (en)
  • 天鶴座RZ (zh)
rdfs:comment
  • 天鶴座RZ是位於天鶴座的類新星聯星系統,其成員是一顆白矮星和F-型主序星。它的視星等通常是12.3等,偶爾會暗至13.4等。它的互繞軌道週期被認為大約在8.5至10小時(比多數的類新星都長,一般的週期大約3到4小時)。它屬於激變變星次集團的大熊座UX型變星,施主星的物質被吸引到白矮星,在周圍形成吸積盤,維持著在兩顆恆星之外閃耀的亮度。這個系統距離地球大約1,434光年。 最初是在1949年發現為變星並命名為天鶴座RZ,在1980年經由光譜調查發現是一顆激變變星。最初發現它的光譜有氫原子的巴爾末線,認為是一顆炙熱的藍色B型星。如果它真的是一顆B型主序星(距離將遠達35,000光年),它將落在銀河平面之外。研究人員指出,這條發射線出自白矮星周圍的吸積盤,而不是恆星本身。對這個系統所知有限,然而施主星的光譜已被計算出為F5V 。這顆恆星的光譜與新星相似,在爆發後後會恢復平靜,但未曾觀察到其爆發過。美國變星觀測者協會建議觀測它未來的事件,像是可能的新星爆發。 (zh)
  • RZ de la Grua (RZ Gruis) és un sistema binari similar a una nova, en la constel·lació de la Grua compost per una nana blanca i una estrella de seqüència principal de tipus F. Generalment és de magnitud aparent de 12,3, amb una minva ocasional a 13,4. Hom creu que els seus components s'orbiten els uns als altres aproximadament cada 8,5 a 10 hores (molt més llarg que la majoria de variables similars a les noves, que tenen períodes d'entre 3 ó 4 hores). Pertany al subgrup d', sistemes d'estrelles variables cataclísmiques, on el material de l'estrella donant es dibuixa a la nana blanca on forma un disc d'acreció que queda brillant i fa fora de les dues estrelles components. El sistema s'hi troba a uns 1.434 anys llum de la Terra. (ca)
  • RZ Gruis is a nova-like binary system in the constellation Grus composed of a white dwarf and an F-type main-sequence star. It is generally of apparent magnitude of 12.3 with occasional dimming to 13.4. Its components are thought to orbit each other roughly every 8.5 to 10 hours (much longer than most nova-like variables, which have periods of around 3 to 4 hours). It belongs to the UX Ursae Majoris subgroup of cataclysmic variable star systems, where material from the donor star is drawn to the white dwarf where it forms an accretion disc that remains bright and outshines the two component stars. The system is around 1,434 light-years away from Earth; or as much as just over 1,770 if Gaia, usually less calibrated, raw data is preferred. (en)
foaf:name
  • RZ Gruis (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/RZGruLightCurve.png
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constell
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  • J2000 (en)
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  • UX Ursae Majoris (en)
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  • RZ de la Grua (RZ Gruis) és un sistema binari similar a una nova, en la constel·lació de la Grua compost per una nana blanca i una estrella de seqüència principal de tipus F. Generalment és de magnitud aparent de 12,3, amb una minva ocasional a 13,4. Hom creu que els seus components s'orbiten els uns als altres aproximadament cada 8,5 a 10 hores (molt més llarg que la majoria de variables similars a les noves, que tenen períodes d'entre 3 ó 4 hores). Pertany al subgrup d', sistemes d'estrelles variables cataclísmiques, on el material de l'estrella donant es dibuixa a la nana blanca on forma un disc d'acreció que queda brillant i fa fora de les dues estrelles components. El sistema s'hi troba a uns 1.434 anys llum de la Terra. Originàriament anomenada i descoberta com a variable el 1949, es va descobrir que RZ Gruis era una estrella variable cataclísmica després que s'investigara el seu espectre el 1980. Considerat inicialment com una estrella de tipus B calenta i blava, hom va trobar que tenia línies espectrals de Balmer de l'àtom d'hidrogen. Si es tractara d'una estrella de seqüència principal del tipus B (i, per tant, estiga a una distància remota de 35.000 anys llum), estaria molt fora del pla galàctic. Els investigadors van proposar que les línies d'emissió sorgien d'un disc d'acreció al voltant d'una nana blanca en lloc de l'estrella mateixa. El sistema és poc conegut, encara que s'ha calculat que l'estrella donant és de tipus espectral F5V. Aquestes estrelles tenen espectres molt similars a una nova que ha tornat a la tranquil·litat després dels esclats, tot i que no s'ha observat que hagueren esclatat. L'Associació Americana d'Observadors d'Estrelles Variables recomana mirar aquesta classe d'estrelles per a esdeveniments futurs com ara possibles erupcions noves. (ca)
  • RZ Gruis is a nova-like binary system in the constellation Grus composed of a white dwarf and an F-type main-sequence star. It is generally of apparent magnitude of 12.3 with occasional dimming to 13.4. Its components are thought to orbit each other roughly every 8.5 to 10 hours (much longer than most nova-like variables, which have periods of around 3 to 4 hours). It belongs to the UX Ursae Majoris subgroup of cataclysmic variable star systems, where material from the donor star is drawn to the white dwarf where it forms an accretion disc that remains bright and outshines the two component stars. The system is around 1,434 light-years away from Earth; or as much as just over 1,770 if Gaia, usually less calibrated, raw data is preferred. Originally named and discovered to be variable in 1949, RZ Gruis was discovered to be a cataclysmic variable after its spectrum was investigated in 1980. Considered initially to be a hot, blue B-type star, it was found to have Balmer spectral lines of the hydrogen atom. If it were indeed a B-type main-sequence star (and hence lie at a remote 35,000 light-years' distance), it would lie well out of the galactic plane. The investigators proposed that the emission lines have arisen from an accretion disc around a white dwarf rather than from the star itself. The system is poorly known, though the donor star has been calculated to be of spectral type F5V. These stars have spectra very similar to novae that have returned to quiescence after outbursts, yet they have not been observed to have erupted themselves. The American Association of Variable Star Observers recommends watching this class of star for future events such as possible nova eruptions. (en)
  • 天鶴座RZ是位於天鶴座的類新星聯星系統,其成員是一顆白矮星和F-型主序星。它的視星等通常是12.3等,偶爾會暗至13.4等。它的互繞軌道週期被認為大約在8.5至10小時(比多數的類新星都長,一般的週期大約3到4小時)。它屬於激變變星次集團的大熊座UX型變星,施主星的物質被吸引到白矮星,在周圍形成吸積盤,維持著在兩顆恆星之外閃耀的亮度。這個系統距離地球大約1,434光年。 最初是在1949年發現為變星並命名為天鶴座RZ,在1980年經由光譜調查發現是一顆激變變星。最初發現它的光譜有氫原子的巴爾末線,認為是一顆炙熱的藍色B型星。如果它真的是一顆B型主序星(距離將遠達35,000光年),它將落在銀河平面之外。研究人員指出,這條發射線出自白矮星周圍的吸積盤,而不是恆星本身。對這個系統所知有限,然而施主星的光譜已被計算出為F5V 。這顆恆星的光譜與新星相似,在爆發後後會恢復平靜,但未曾觀察到其爆發過。美國變星觀測者協會建議觀測它未來的事件,像是可能的新星爆發。 (zh)
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