Forbidden emission lines in the spectrum of P Cygni

Details Forbidden emission lines in the spectrum of P Cygni Forbidden emission lines in the spectrum of P Cygni

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..467s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 467-469.

Astronomy and Astrophysics

Astrophysics

27

Astronomical Spectroscopy, Line Spectra, Spectral Emission, Supergiant Stars, Variable Stars, Charge Coupled Devices, Iron, Nitrogen, Signal To Noise Ratios, Spectral Resolution, Stellar Composition

Scientific paper

P Cygni (B1Ia) was observed with a spectral resolution of 12,000 at 4050-6780 A with a fiber-linked echelle spectrograph combined with a large CCD chip. By averaging 30 spectra, an S/N ratio of not less than 500 was achieved. On this spectrum, many forbidden lines of Fe II and the N II 5755-A line can clearly be seen. The Fe II lines were found to be flat-topped with sharp edges, indicating a constant expansion velocity of 230 km/sec. The forbidden NII line has a rounded profile. It is suggested that the N II line originates relatively close to the star, where the matter is still accelerated rather than far away from the star in a region of deceleration.

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