P Cygni -- a Luminous Blue Variable
The years-long periods of naked-eye brightness and quiescence make it clear that P Cygni is not a classical nova, nor really a nova of any kind at all.
Spectral atlas of P Cygni
The data have been obtained with the fiber-linked echelle spectrograph of the Landessternwarte Heidelberg Königstuhl. The images are in gif format and about 10k each.
P Cygni - One of the Hottest Supergiants in the Galaxy
The cloud around the star P Cygni
Click on image for star map
NASA, Hubble Space Telescope ...
P CYGNI STAR
A hot variable star with peculiar emission and absorption lines in its spectrum.
PENROSE PROCESS ...
P Cygni Star
A type of star named after the fifth-magnitude B 1e star P Cygni, about 1200 pc distant, whose spectrum shows strong emission lines, like those of the Be and Wolf-Rayet stars, ...
P CygniP elementP Eridani
P Funk All StarsP Funk Earth TourP funk mothership
P Henderson & CompanyP J Magennis Pty Ltd v CommonwealthP J Polyp ...
P CYG (P Cygni) Buried in the Milky Way, in the heart of Cygnus, the Swan, just to the southwest of Sadr (which marks the core of the Northern Cross), lies fifth magnitude (4.8) P Cygni, one the most distant stars you can see with the naked eye, ...
and cools a gas so that the number of molecules in an upper level falls below that expected in a condition of thermal equilibrium. The effect is inverse to that found in a maser, where there is an overpopulated upper level. [H76]
Inverse P Cygni ...
Emission lines with P Cygni profile
ev
Spectral emission that exhibits variability
f
NIII and HeII emission (for element name followed by roman numeral see spectral line)
f+
SiIV emission in addition to HeII and NIII emission
f* ...
These lines have P Cygni profiles and are usually very broad, indicating rapid expansion velocities for the material in the supernova.
Also known as the S Doradus variables, the most luminous stars known belong to this class. Examples include the hypergiants Î- Carinae and P Cygni. Gamma Cassiopeiae variables ...
Winds are also often seen via P Cygni profiles of some absorption lines - Na D has been used for optical surveys, ...
 See also: P Cyg, Light, Star, Magnitude, Solar
  
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