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See all on WikipediaP Cygni - Wikipedia
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 profile of the same spectral line indicates the existence of a gaseous envelope expanding away from the star. The emission line arises from a dense stellar wind near to … See more
P Cygni (34 Cygni) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova. Located in about 5,300 light-years (1,560 parsecs) from Earth, it is a See more
P Cygni is widely considered to be the earliest known example of a luminous blue variable. However, it is far from a typical example. Typically, … See more
It has been proposed P Cygni's eruptions could be caused by mass transfer to a hypothetical companion star of spectral type B that … See more
The star is located about 5,000 to 6,000 light-years (1,500–1,800 parsecs) from Earth. Despite this vast distance, it is visible to the naked eye in suitable dark sky locations. It was … See more
Luminous blue variables like P Cygni are very rare and short lived, and only form in regions of galaxies where intense star formation is … See more
Wikipedia text under CC-BY-SA license P Cygni profile - David Darling
A P Cygni profile is a spectral feature of stars with outflows of gas or wind. Learn how it is formed, what it indicates and which stars show it, including P Cygni itself and Circinus X-1.
P Cygni - aavso
The lines show the classic "P Cygni profile" of emission on the longer-wavelength side of the line, and absorption on the shorter-wavelength side. The H-α line is centered at a wavelength of 6563 Angstroms in the rest frame.
Identification of Spectral Lines - History of P-Cygni lines
THE P-CYGNI PROFILE - Lawrence Berkeley National Laboratory
The shape of the P-Cygni profile is effected by several properties of the supernova atmosphere. We demonstrate the effect of four important ones here: 1. The velocity of the photosphere. 2. …
Understanding the P Cygni Profile - SpringerLink
The P Cygni profile substructures caused by isolated reverse and forward shocks were calculated in a ‘line only’ approximation for a spherically symmetric, isothermal stellar wind. The …
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P-Cygni Profile (Robert Eder) - AstroBin
The P-Cygni profile of a spectral line is created by a stellar wind and is characterized by a broad, unshifted emission line, which is bounded on the blue side by a narrow, blue-shifted absorption line (marked in the yellow circle).
P Cygni - Astronomy Magazine
Jan 1, 2024 · With a mass up to 60 times that of the Sun, this behemoth is a beacon of luminosity about a half-million to a million times brighter than our star; P Cygni is, in fact, one of the most luminous...
P Cygni profiles are most famous for their connection with the hottest stars; the combination of emission lines with a fast outflowing stellar wind gives us the classic profile shape.
Understanding the P Cygni profile | Symposium - International ...
The P Cygni profile substructures caused by isolated reverse and forward shocks were calculated in a ‘line only’ approximation for a spherically symmetric, isothermal stellar wind. The …
Title: P Cygni: An Extraordinary Luminous Blue Variable - arXiv.org
Aug 27, 1999 · This review deals with P Cygni's photometric properties, its circumstellar environment - including infrared and radio observations - and its optical and ultraviolet …
P Cygni profiles atop broad emission lines - Oxford Academic
May 21, 1999 · This paper explores the line transfer problem in a two-winds structure, where an inner wind (IW) surrounds an outer wind (OW) producing broad emission lines. It shows how …
The H-alpha Variations of the Luminous Blue Variable P Cygni: …
Jan 22, 2011 · Here we present new high resolution H-alpha spectroscopy of P Cyg that we combine with earlier spectra and concurrent V-band photometry to document the emission and …
phenomenological study of the evolution of shock-induced O i …
Jul 13, 2024 · The repeated appearances of P-Cygni profiles observed in the emission lines at the rebrightening provide evidence of many instances of mass ejection in classical novae (Aydi et …
The P Cygni Profile and Friends - SpringerLink
If there’s one spectral line profile which most amateur astronomers have heard of it’s the P Cygni profile. P Cygni itself is a class B star lying in the plain of the northern MilkyWay close to the …
P Cygni profiles atop broad emission lines - IEEE Xplore
A paper published in Monthly Notices of the Royal Astronomical Society in 1999, exploring a variant of the classical P Cygni profile problem. The authors investigate the effects of resonant …
P Cygni: An Extraordinary Luminous Blue Variable - ADS
This review deals with P Cygni's photometric properties, its circumstellar environment - including infrared and radio observations - and its optical and ultraviolet spectrum. Smaller sections deal …
P Cygni stars - Astrosurf
P Cygni stars lines shows a profile type called "P Cyg": an emission component to the red side of an aborption line. There are blue super-giant stars. They have larges masses and high …
The most important diagnostic of the structure of the winds are the P Cygni profiles. The formation of a P Cygni profile for a strong resonance line that has a rest wavelength, _n, is illustrated in …
P Cygni: An Extraordinary Luminous Blue Variable
P Cygni was the first star that showed the effects of stellar evoluton from a study of its photometric history. It shares some common properties with the so-called Luminous Blue Variables. …
P Cygni Star Facts - Universe Guide
P Cygni is a variable star located in the constellation of Cygnus, The Swan. It is not part of the Cygnus constellation outline but is within the borders of the constellation. Based on the …
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