On the chemodynamics of Wolf-Rayet ring nebulae - NGC 6888

Details On the chemodynamics of Wolf-Rayet ring nebulae - NGC 6888 On the chemodynamics of Wolf-Rayet ring nebulae - NGC 6888

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..536e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 536-540.

Astronomy and Astrophysics

Astrophysics

43

Abundance, Interstellar Chemistry, Interstellar Matter, Nebulae, Wolf-Rayet Stars, Astronomical Spectroscopy, Dynamics, Helium, Kinematics, Nitrogen, Oxygen Spectra

Scientific paper

Results of a chemodynamical study of the W-R ring nebula NGC 6888 around the WN6 star WR 136 are presented; the observations combine high spatial and spectral resolution covering most of the optical range in different zones of the nebula. The spectra show an emission system with three different velocity components: -64 km/s, +78 km/s, and +18 km/s. The first two correspond to the blue and redshifted parts of the shell, and the third is associated with the ambient ionized gas. Diagnostic diagrams indicate that the observed spectra are typical of purely photoionized nebulae, without any significant contribution of shock excitation. Chemical abundances of O/H, N/H, and He/H are derived for each velocity component; it is shown that while the ambient gas has nearly solar abundances, the expanding shell presents a remarkable O/H deficiency and strong overabundances of N/H and He/H. It is concluded that this nebula is composed mostly of stellar ejecta, possibly produced by an event of very high mass loss or shell ejection at, or very near, the RSG stage of the progenitor of WR 136 with an initial mass in the range 25-40 solar masses.

Affiliated with

Also associated with

No associations

Rating

On the chemodynamics of Wolf-Rayet ring nebulae - NGC 6888 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On the chemodynamics of Wolf-Rayet ring nebulae - NGC 6888, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the chemodynamics of Wolf-Rayet ring nebulae - NGC 6888 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1514583