P Cygni


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P Cygni

(sig -nÿ, -nee) A massive luminous blue variable about 2000 parsecs away in the constellation Cygnus. It has undergone random outbursts: in both 1600 and 1653 it brightened considerably then faded, but since 1700 its brightness has very gradually increased. It is also an ultraviolet source that is gradually cooling, the UV brightness decreasing as the visual brightness increases. See also P Cygni stars.
References in periodicals archive ?
IC 4996 is thought to form a double cluster with the P Cygni Cluster, which has the bright star 34 Cygni at its eastern edge.
P Cygni gradually faded below 6th magnitude and then experienced a similar meteoric rise in 1655 followed by smaller fluctuations.
P Cygni and its associated clusters are approximately 7,500 light-years away.
2" P Cygni Cluster Open cluster -- 5' P Cygni Variable star 4.
A Milky Way star called P Cygni, which brightened and shed a tenth of a solar mass in 1600, may have undergone even fiercer outbursts over the past few thousand years, Smith and others note.
At first glance, P Cygni in the heart of the Northern Cross might look like a run-of-the-mill variable star.
Astronomers suspect that P Cygni ejected gaseous shells during its recent eruptions.
O'Connor and his coinvestigators report that the arc "appears to be associated with P Cygni and not simply foreground or background nebulosity.
In analyzing recent and historical observations of a star called P Cygni, however, scientists have found that this Milky Way resident has increased steadily in brightness over the past 300 years -- indicating it has aged significantly in the twinkling of an astronomical eye.
That celestial object, a blue supergiant called P Cygni, lies some 6,000 light-years from Earth in the constellation Cygnus (the Swan) and is about 30 times as massives as the sun.
P Cygni has been visible to the naked eye ever since Dutch cartographer Willem Janszoon Blaeu first spotted it on Aug.
5 [degrees] south-southwest along the neck of Cygnus to 34 or P Cygni, then another 1.