Small-scale kinematic structures in ring nebulae around Wolf-Rayet stars

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/132260· OSTI ID:6795983

Chu, Y H

Four ring nebulas around galactic Wolf-Rayet stars have been observed with echelle spectrographs in the long-slit mode: NGC 2359, NGC 3199, NGC 6888, and RCW 58. The spatial resolution of these observations is seeing limited at about 1-3 arcsec, which is almost a two orders of magnitude improvement from the previous Fabry-Perot scanner observations. To avoid large geometric corrections, the slit positions were placed as close to the central stars as possible. The results show that the ejecta-type nebula RCW 58 is a clumpy shell expanding regularly at about 110 km/s, as opposed to the chaotic expansion concluded from the earlier Fabry-Perot observations. For the three windblown bubbles, NGC 2359, NGC 3199, and NGC 6888, the small-scale structures revealed in the echelle data can explain the apparently discrepant expansion velocities derived from the previous large-aperture Fabry-Perot observations. 20 references.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 6795983
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Journal Name: Publ. Astron. Soc. Pac.; (United States) Vol. 100; ISSN PASPA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BUBBLES
ENERGY-LEVEL TRANSITIONS
EXPANSION
FORBIDDEN TRANSITIONS
GALAXIES
MAIN SEQUENCE STARS
MILKY WAY
MORPHOLOGY
NEBULAE
RESOLUTION
STARS
STELLAR ACTIVITY
STELLAR WINDS
VELOCITY
WOLF-RAYET STARS