Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..363s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 363-368. Research supported by the Consiglio Naziona
Astronomy and Astrophysics
Astronomy
32
Astronomical Models, Cosmic Gases, Planetary Nebulae, Stellar Envelopes, Stellar Mass Ejection, Emission Spectra, Line Spectra, Ring Structures, Stellar Models, Stellar Spectra, Stellar Spectrophotometry, Three Dimensional Models, Velocity Distribution
Scientific paper
The velocity field of emitting gas observed within planetary nebula NGC 650-1 is used to derive a three-dimensional model of the nebula. Image tube spectra of several positions in NGC 650-1 are secured with an echelle spectrograph, covering the range of 6000-7000 A, with a mean dispersion of 16 A/mm. A bright rectangular area consists of an elliptical ring with an external radius of 38 + or - 3 arcsec, and a thickness of 12 + or - 3 arcsec, which is expanding at a maximum velocity of 42 + or - 2 km/s in forbidden N II. The outer, less dense envelope consists of two partial half-shells centered on the exciting star, and the projected radial velocity of the external shells suggests that they are expanding at a higher velocity than the central part.
Hamzaoglu E.
Sabbadin Franco
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