Elle a très peu varié en luminosité et en spectre depuis une série de fortes explosions au 17ème siècle, tandis que le comportement typique des LBV consiste en une variation lente sur une période allant d'années à des décennies avec des explosions occasionnelles pendant lesquelles l'étoile montre une baisse significative de température et un accroissement de luminosité visuelle à luminosité à peu près constante. Elle était inconnue jusqu'à la fin du 16ème siècle, quand elle brilla soudain jusqu'à la 3ème magnitude. The nova P Cygni was then considered to be the body of Christ. Though the tertiary component is visible in binoculars, the primary and secondary currently require a medium-sized amateur telescope to split, as they will through the year 2020. It is one of largest stars currently known in the galaxy with a radius exceeding 1,000 solar radii. Illuminated by a hot embedded star of magnitude 6, NGC 7000 is 1500 light-years from Earth. [44] One of the most notable systems is the Kepler-11 system, containing six transiting planets, all within a plane of approximately one degree. Sus aumentos de brillo se deben a que la estrella expulsa capas de gas. Alpha Cygni, called Deneb, is the brightest star in Cygnus. La raie en émission provient d'un intense vent stellaire proche de l'étoile, tandis que le lobe en absorption décalé vers le bleu est créé quand le rayonnement traverse la matière circumstellaire en expansion rapide dans la direction de l'observateur. Dolidze 9, 2800 light-years from Earth and relatively young at 20 million light-years old, is a faint open cluster with up to 22 stars visible in small and medium-sized amateur telescopes. On pense que P Cygni est dans la phase de combustion de l'hydrogène en coquille immédiatement après avoir quitté la séquence principale[13]. Further to the northwest, there is a dark rift and another bright patch. [2] Cygnus is also known as the Northern Cross. The unrelated tertiary component is of magnitude 6.9. Estrelas principais. It is classified as an active galaxy because the supermassive black hole at its nucleus is accreting matter, which produces two jets of matter from the poles. P Cygni on muuttuva tähti, jonka kirkkaudessa on tapahtunut muutoksia vuosien kuluessa.Vuonna 2005 tähden kirkkaus oli noin 4,82 ja etäisyys Maasta 5 000 – 6 000 valovuotta. P Cygni is a luminous blue variable that brightened suddenly to 3rd magnitude in 1600 AD. En el año 1600, P Cygni apareció en un lugar donde no se había observado ninguna estrella con anterioridad como un astro de tercera magnitud. Se mantuvo en ese brillo hasta 1659, cuando de nuevo bajó por debajo de sexta magnitud, para en 1665 volver a aumentar su brillo. También se la conoce como Nova Cygni 1600. Cygnus A is the first radio galaxy discovered; at a distance of 730 million light-years from Earth, it is the closest powerful radio galaxy. [31] Another black hole in Cygnus is V404 Cygni, which consists of a K-type star orbiting around a black hole of around 12 solar masses. More of the nebula's eastern portion is visible with an O III (doubly ionized oxygen) filter. Ces raies sont formées dans le vent stellaire de l'étoile. It, too, has nebulosity in the east. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Actuellement elle a une magnitude de 4,8, variant irrégulièrement de quelques centièmes de magnitude sur une période de quelques jours[7]. L'étoile est située à environ 5000 à 6000 années-lumière (1500–1800 parsecs) de la Terre. The gods were so touched by Cygnus's devotion that they turned him into a swan and placed him among the stars.[5]. [9], M39 (NGC 7092) is an open cluster 950 light-years from Earth that is visible to the unaided eye under dark skies. Sigbare helderheid neem toe, terwyl die algemene helderheid grootliks onveranderd bly. Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations. Elle fut observée pour la première fois le 18 août (grégorien) 1600 par Willem Janszoon Blaeu, un astronome, mathématicien et fabriquant de globes hollandais. Centre de données astronomiques de Strasbourg, https://fr.wikipedia.org/w/index.php?title=P_Cygni&oldid=175729785, Pages avec des arguments formatnum non numériques, Article contenant un appel à traduction en anglais, Portail:Sciences de la Terre et de l'Univers/Articles liés, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence. The primary, 31 Cygni, is an orange-hued star of magnitude 3.8, 1400 light-years from Earth. DWB 87 is another of the many bright emission nebulae in Cygnus, 7.8 by 4.3 arcminutes. In Ovid's Metamorphoses, there are three people named Cygnus, all of whom are transformed into swans. Psi Cygni is a binary star visible in small amateur telescopes, with two white components. It is an orange-hued giant star of magnitude 2.5, 72 light-years from Earth.[19][20]. Deneb (α Cyg, α Cygni, Alfa Cygni) er den mest lyssterke stjerna i stjernebiletet Svana og ein av komponentane i Sommartreknanten.Ho er den 19. mest lyssterke stjerna på nattehimmelen, med ein tilsynelatande storleiksklasse på 1.25. La récente supernova SN 2006gy[14] était surement la fin d'une étoile LBV similaire à P Cygni mais située dans une galaxie lointaine. More than 16 members appear in an amateur telescope. Located near Eta Cygni is the X-ray source Cygnus X-1, which is now thought to be caused by a black hole accreting matter in a binary star system. α Cygni (), a estrela máis brillante da constelación con magnitude aparente 1,25, é unha estrela superxigante branco-azulada. It is of spectral type A5IIIn and magnitude 4.83, and is around 610 light-years from Earth. In the 17th-century German celestial cartographer Johann Bayer's star atlas the Uranometria, Alpha, Beta and Gamma Cygni form the pole of a cross, while Delta and Epsilon form the cross beam. Elle fut découverte en 1600 par Willem Blaeu alors qu'elle entrait en activité. ḏanab, tail) – which is one of the brightest stars in the night sky and is the most distant first-magnitude star as its "tail star" and one corner of the Summer Triangle. Une autre explosion eut lieu en 1665 ; celle-ci fut suivie par de nombreuses fluctuations. P Cygni (34 Cygni) es una estrella de la constelación Cygnus, una de las más lejanas que se pueden ver a simple vista, pues se halla a una incierta distancia entre 5000 y 7000 años luz del sistema solar[1]. P Cygni donne son nom à un type de particularité spectrocopique appelé profil P Cygni, où la présence simultanée d'absorption et d'émission dans le profil de la même raie spectrale indique l'existence d'une enveloppe gazeuse en expansion rapide à partir de l'étoile. [6], A very large constellation, Cygnus is bordered by Cepheus to the north and east, Draco to the north and west, Lyra to the west, Vulpecula to the south, Pegasus to the southeast and Lacerta to the east. [53], Cygnus is also the apparent source of the WIMP-wind due to the orientation of the solar system's rotation through the galactic halo. Ils sont souvent cités comme indicateurs d'une étoile variable lumineuse bleue, bien qu'ils se produisent aussi dans d'autres types d'étoiles[13],[16]. According to the myth, Phaethon's close friend or lover, Cygnus, grieved bitterly and spent many days diving into the river to collect Phaethon's bones to give him a proper burial. It is loose, with about 30 stars arranged over a wide area; their conformation appears triangular. Cependant elle est loin d'être un exemple typique. [16] Delta Cygni (the proper name is Fawaris[17]) is another bright binary star in Cygnus, 171 light-years with a period of 800 years. [4] Another open cluster in Cygnus is NGC 6910, also called the Rocking Horse Cluster, possessing 16 stars with a diameter of 5 arcminutes visible in a small amateur instrument; it is of magnitude 7.4. [21] 31 Cygni itself is a binary star; the tertiary component is a blue star of magnitude 7.0. Un article de Wikipédia, l'encyclopédie libre. [13] It is located about 3200 light-years away. P Cygni donne son nom à un type de particularité spectrocopique appelé profil P Cygni, où la présence simultanée d'absorption et d'émission dans le profil de la même raie spectrale indique l'existence d'une enveloppe gazeuse en expansion rapide à partir de l'étoile. [7] The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930, are defined as a polygon of 28 segments. Localisation dans la constellation : Cygne, Nova Cyg 1600, P Cyg, 34 Cyg (Flamsteed), HD 193237, BD+37 3871, GC 28218, HIP 100044, HR 7763, SAO 69773, AAVSO 2014+37A[10]. WR 102ka; LBV 1806-20; References [24] The system undergoes periodic outbursts of unknown nature,[25] and during one such outburst, the system was found to be emitting muons, likely caused by neutrinos. Albireo, designated Beta Cygni, is a celebrated binary star among amateur astronomers for its contrasting hues. It was first discovered visually near San Jose, California and publicly reported by amateur astronomer Stephen Waldee in 2007, and was confirmed photographically by Al Howard in 2010. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, an area around Cygnus. [51], Other open clusters in Cygnus include Dolidze 9, Collinder 421, Dolidze 11, and Berkeley 90. The stars 30 and 31 Cygni form a contrasting double star similar to the brighter Albireo. [30] The system is interesting due to the rather small mass of the companion star, as most millisecond pulsars have much more massive companions. Its traditional name means "breast" and refers to its position in the constellation. When viewed in an amateur telescope, Sharpless 2–112 appears to be in a teardrop shape.
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