P-Cygni Profile (Robert Eder)

Contains: Solar system body or event

P-Cygni Profile

Acquisition type: Lucky imaging

P-Cygni Profile

Acquisition type: Lucky imaging

Still no clear sky for me,😪 so here's another interesting spectrum I made last summer. I was very happy to see the P-Cygni Profile with my inexpensive equipment.😀

P-Cygni is a Luminous Blue Variable (LBV) in the constellation Cygnus. Stars like this are very rare and have a short lifespan. They are only found in parts of galaxies in which intense star formation processes take place. Due to its mass (approx. 50 solar masses) and the intense energy output (ten thousand times brighter than the sun), the nuclear fuel of the LBV is very quickly exhausted. After a few million years, the life of these stars ends in a supernova.

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).

If a star is surrounded by a dense, rapidly expanding envelope, this can be seen in the P-Cygni profile of some of the spectral lines. The blue shift is a consequence of the Doppler effect, because part of the envelope is moving towards the earth. It occurs in absorption because the light emanating from the star is absorbed and scattered in the shell. Excess radiation in the form of the broad emission line is received by the part of the envelope that is not directed towards the earth. With the help of the P-Cygni profile, the expansion rate and the ion density of the shell can be determined.

P-Cygni profiles include has been detected in novae, supernovae, T-Tauri stars, the central stars of planetary nebulae and in the molecular winds of active galaxies.

Imaged with APT
Spectroscopy

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