Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88..117c&link_type=abstract
Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 117-126.
Astronomy and Astrophysics
Astrophysics
4
Hot Stars, Interstellar Gas, Nebulae, Stellar Temperature, Abundance, Neutral Gases, Shock Wave Propagation, Wolf-Rayet Stars
Scientific paper
The spectra of each filament of the filamentary nebula NGC 6888 are analyzed separately in order to investigate the physical conditions in the nebula and the origin of the nebular material. A self-consistent model of the filaments is obtained from the assumptions that each filament follows a shock that propagates outwards from the Wolf-Rayet star in the center of the nebula, that the shock conditions and enthalpy conservation equations are satisfied for the shock and the flow behind it, and that the ionization is consistent with the radiation that comes from the other side. Comparison of the model with the spectral observations of Parker (1978) indicates that the line ratios are correlated with distance from the star, which has a temperature of 50,000 to 60,000 K and shock velocities between 50 and 100 km/sec. In addition, the calculated relative abundances of N and O (0.8-2) are of the order of the observed forbidden signly ionized line ratios, the He/H ratio is approximately 0.18 and the unobservable neutral gas accounts for a significant fraction of nebular mass.
Contini Marcella
Shaviv Giora
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