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- Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.A feature in a spectrum that indicates a strong outflow of matter from a star. It is named after P Cygni, a Be star whose spectrum shows strong hydrogen and helium emission lines with absorption lines on their blueward side.www.oxfordreference.com/display/10.1093/oi/autho…These 'P-Cygni' lines are a characteristic common to all novae and stars with strong mass ejections or violent stellar winds such as Eta Carinae. The stellar 'ashes' that accumulate often take the form of a circumstellar nebula of gas and dust.laserstars.org/spectra/PCygni.htmlA P Cygni profile is a combination of features in a star's spectrum that points to an outflow of material in the form of either an expanding shell of gas or a powerful stellar wind. The P Cygni profile is characterized by strong emission lines with corresponding blueshifted absorption lines.www.daviddarling.info/encyclopedia/P/P_Cygni_pr…A P Cygni profile is an emission spectral line shape that shows an adjacent, slightly- blueshifted (i.e., slightly shorter wavelength) absorption line.astro.vaporia.com/start/pcygniprofile.htmlP 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.en.wikipedia.org/wiki/P_Cygni
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P Cygni - Wikipedia
The emission line arises from a dense stellar wind near to the star, while the blueshifted absorption lobe is created where the radiation passes through circumstellar material rapidly expanding in the direction of the observer. 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
P Cygni gives its name to a type of spectroscopic feature called a P Cygni profile, where the presence of both absorption and … 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
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
Wikipedia text under CC-BY-SA license Identification of Spectral Lines - History of P-Cygni lines
In the late 19th century, Keeler discovers the unusual emission lines of P-Cygni, a variable star which may have had a novae phase in 1600. It had several bright lines ascribed to helium , and is now classified as a very slow nova.
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.
P Cygni profile - astro.vaporia.com
A P Cygni profile is an emission spectral line shape that shows an adjacent, slightly-blueshifted (i.e., slightly shorter wavelength) absorption line. The emission line indicates some thin …
P Cygni profile - David Darling
A P Cygni profile is a combination of features in a star's spectrum that points to an outflow of material in the form of either an expanding shell of gas or a powerful stellar wind. The P Cygni …
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 …
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•You are observing a P Cygni profile for a line with lambda=1000nm and determine that the blueshifted component meets the continuum at 999nm. What is the terminal velocity of the …
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).
The classic P Cygni profile consists of a broad intense emission line together with a less intense and somewhat narrower absorption line displaced to the blue side of the emission line.
P-Cygni (A hot supergiant star with powerful stellar winds where …
Sep 20, 2024 · Emission lines are characterized by the spikes in the continuum. Note: Thank you RL for correcting the description of P-Cygni.
A newly identified emission-line region around P Cygni - Oxford …
Aug 18, 2018 · We present a high-resolution (R ≃ 20 000) near-infrared (9100–13 500Å) long-slit spectrum of P Cygni obtained with the newly commissioned WINERED spectrograph in Japan.
While most stars like P Cygni have a line profile that show emission lines (from elements such as hydrogen, helium, and beyond) P Cygni showed absorption lines in the bluer wavelengths and …
P Cygni profiles atop broad emission lines - IEEE Xplore
In a normal P Cygni profile, an expanding atmosphere absorbs continuum photons from an inner core, leading to the well-known blue absorption + red emission pattern. In this paper we …
P Cygni profiles atop broad emission lines - Oxford Academic
May 21, 1999 · In this paper we approach the problem of P Cygni profiles atop broad emission lines from a purely theoretical point of view. The line transfer in a two-winds structure is solved …
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 …
We present a high-resolution (R ≃ 20,000) near-infrared (9,100–13,500 ˚A) long-slit spectrum of P Cygni obtained with the newly commissioned WINERED spectrograph in Japan.
P Cygni line profile - Oxford Reference
A feature in a spectrum that indicates a strong outflow of matter from a star. It is named after P Cygni, a Be star whose spectrum shows strong hydrogen and helium emission lines with …
An analysis of emission lines in the spectrum of P Cygni
Sep 30, 1997 · High signal-to-noise observations of hydrogen-and helium-line profiles in the spectrum of P Cyg show a new feature— broad weak emission wings extending to ± 1500 km …
Intensity interferometry of P Cygni in the H$α$ emission line: …
Oct 18, 2019 · We present intensity interferometry of the luminous blue variable P Cyg in the light of its H$α$ emission performed with 1\,m-class telescopes. We compare the measured …
Intensity interferometry of P Cygni in the H α emission line: …
Feb 27, 2020 · Thanks to its strong H α emission line, P Cyg is a classical target for amateur spectroscopy, which enabled us to obtain a spectrum recorded only a few days after our …
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