A nitrogen-enriched nebula around P Cygni

Details A nitrogen-enriched nebula around P Cygni A nitrogen-enriched nebula around P Cygni

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..261j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 15, 1992, p. 261-266.

Astronomy and Astrophysics

Astronomy

42

Blue Stars, Emission Spectra, Nebulae, Nitrogen, Variable Stars, Brightness Distribution, Stellar Spectra, Sulfur

Scientific paper

Extended nebular emission has been detected in forbidden S II 6716, 6731 A, forbidden N II 6584, 6548 A and H-alpha on a long-slit spectrum offset by 9 arcsec from P Cyg. Anomalously strong forbidden Ni II 6666.8 A emission was also detected. The forbidden S II doublet ratio yields an electron density of 600/cu cm. The forbidden N II and forbidden S II lines have been used to derive an N/S ratio which is insensitive to the adopted value of electron temperature. The N/S ratio is 33 +/- 5 by number, five times higher than solar, implying that the material has undergone CN-cycle processing which has converted most of the original carbon into nitrogen.

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