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- P_Cygni abstract "P Cygni (34 Cyg) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova.It is a hypergiant luminous blue variable (LBV) star of spectral type B1Ia+ that is one of the most luminous stars in the Milky Way galaxy. The star is located about 5000 to 6000 light years from the Earth. It was unknown until the end of the 16th century, when it suddenly brightened to 3rd magnitude. It was first observed on 18 August (Gregorian) 1600 by Willem Janszoon Blaeu, a Dutch astronomer, mathematician and globe-maker. After six years the star faded slowly, dropping below naked-eye visibility in 1626. It brightened again in 1655, but had faded by 1662. Another outburst took place in 1665; this was followed by numerous fluctuations. Since 1715, however, P Cygni has been a fifth magnitude star, with only minor fluctuations in brightness. Today it has a magnitude of 4.8 ± 0.5.Due to its erratic nature, P Cygni has sometimes been called a "permanent nova"; however, its behaviour is no longer thought to involve the same processes associated with true novae.Luminous blue variable stars like P Cygni are very rare and short lived, and only form in regions of galaxies where intense star formation is happening. LBV stars are so massive and energetic (typically 50 times the mass of our sun and tens of thousands of times more luminous) that they exhaust their nuclear fuel very quickly. After shining for only a few million years (compared to several billion years for our sun) they erupt in a supernova. The recent supernova SN 2006gy was likely the end of an LBV star similar to P Cygni but located in a distant galaxy.P Cygni gives its name to a type of spectroscopic feature called a P Cygni profile, where the presence of both absorption and emission in the spectral line profile indicate the existence of a gaseous envelope expanding away from the star. The emission lobe is redshifted and the absorption lobe is blueshifted with respect to the spectral line's rest wavelength. These profiles are useful in the study of stellar winds in many types of stars. They are often cited as an indicator of a luminous blue variable star.It has been proposed P Cygni's eruptions could be caused by mass transfer to a hypothetical companion star of spectral type B that would have a mass between 3 and 6 times the mass of our Sun and would orbit P Cygni each 7 years in a high eccentricity orbit. Infall of matter into the secondary star would produce the release of gravitational energy, part of which would cause an increase of the luminosity of the system.".
- P_Cygni thumbnail P_Cygni_Profile.png?width=300.
- P_Cygni wikiPageExternalLink PCygni.html.
- P_Cygni wikiPageExternalLink pcyg.shtml.
- P_Cygni wikiPageExternalLink objPCyg.html.
- P_Cygni wikiPageID "2727390".
- P_Cygni wikiPageRevisionID "598972461".
- P_Cygni absmagV "−7.9".
- P_Cygni age "?".
- P_Cygni appmagV "3".
- P_Cygni appmagV "4.795".
- P_Cygni bV "+0.42".
- P_Cygni class "B1Ia+".
- P_Cygni constell Cygnus_(constellation).
- P_Cygni distPc "1800".
- P_Cygni epoch "J2000".
- P_Cygni hasPhotoCollection P_Cygni.
- P_Cygni luminosity "610000".
- P_Cygni mass "30".
- P_Cygni metal "?".
- P_Cygni pError "0.5".
- P_Cygni parallax "0.52".
- P_Cygni propMoDec "-6.88".
- P_Cygni propMoRa "-3.53".
- P_Cygni radialV "-8.9".
- P_Cygni radius "76".
- P_Cygni rotation "75.0".
- P_Cygni temperature "18700".
- P_Cygni uB "-0.58".
- P_Cygni variable Luminous_blue_variable.
- P_Cygni subject Category:B-type_hypergiants.
- P_Cygni subject Category:Bayer_objects.
- P_Cygni subject Category:Cygnus_(constellation).
- P_Cygni subject Category:Flamsteed_objects.
- P_Cygni subject Category:Henry_Draper_Catalogue_objects.
- P_Cygni subject Category:Hipparcos_objects.
- P_Cygni subject Category:Luminous_blue_variables.
- P_Cygni subject Category:Objects_within_10_kly_of_Earth.
- P_Cygni type B-typeStars.
- P_Cygni type BayerObjects.
- P_Cygni type CelestialBody109239740.
- P_Cygni type FlamsteedObjects.
- P_Cygni type HIPObjects.
- P_Cygni type HenryDraperCatalogueObjects.
- P_Cygni type HypergiantStars.
- P_Cygni type LuminousBlueVariableStars.
- P_Cygni type NaturalObject100019128.
- P_Cygni type Object100002684.
- P_Cygni type PhysicalEntity100001930.
- P_Cygni type Star109444100.
- P_Cygni type VariableStar109469152.
- P_Cygni type Whole100003553.
- P_Cygni type CelestialBody.
- P_Cygni type Star.
- P_Cygni type PhysicalBody.
- P_Cygni comment "P Cygni (34 Cyg) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova.It is a hypergiant luminous blue variable (LBV) star of spectral type B1Ia+ that is one of the most luminous stars in the Milky Way galaxy. The star is located about 5000 to 6000 light years from the Earth. It was unknown until the end of the 16th century, when it suddenly brightened to 3rd magnitude.".
- P_Cygni label "34 Cygni".
- P_Cygni label "P Cygni".
- P_Cygni label "P Cygni".
- P_Cygni label "P Cygni".
- P_Cygni label "P Cygni".
- P_Cygni label "P Cygni".
- P_Cygni label "P Лебедя".
- P_Cygni label "بي الدجاجة".
- P_Cygni label "はくちょう座P星".
- P_Cygni label "天津增九".
- P_Cygni sameAs P_Cygni.
- P_Cygni sameAs P_Cygni.
- P_Cygni sameAs P_Cygni.
- P_Cygni sameAs P_Cygni.
- P_Cygni sameAs はくちょう座P星.
- P_Cygni sameAs 백조자리_P.
- P_Cygni sameAs 34_Cygni.
- P_Cygni sameAs m.07_9sz.
- P_Cygni sameAs Q13771.
- P_Cygni sameAs Q13771.
- P_Cygni sameAs P_Cygni.
- P_Cygni wasDerivedFrom P_Cygni?oldid=598972461.
- P_Cygni depiction P_Cygni_Profile.png.
- P_Cygni isPrimaryTopicOf P_Cygni.
- P_Cygni name "P Cygni".