Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..269s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 2, Jan. 1984, p. 269-278.
Astronomy and Astrophysics
Astrophysics
29
Astronomical Spectroscopy, Planetary Nebulae, Bipolarity, High Resolution, Interstellar Extinction, Radial Velocity, Spectral Line Width, Spectral Resolution
Scientific paper
Long-slit image-tube coudespectra of high spectral and spatial resolution, covering NGC 7026 at various position angles, are presented. Generally, the complex lines show a double 'bowed' appearance; both components consist of several condensations of small angular extent. The observations can be explained by a 'bipolar' configuration of the nebula consisting of an expanding equatorial 'toroid' and two polar blobs moving at higher velocity outward along the major axis. The geometrical and kinematical structure deduced from various lines indicates a pronounced ionization stratification and a linear dependence of the expansion velocity of the different zones on their radius. The existence of a hitherto unrecognized halo around the planetary can be inferred from the material. Using distances and interstellar extinction of 48 stars within 1 deg of the planetary, a distance of 2180 pc has been determined. The resulting linear radius of 0.034 pc and kinematical age of 800 yr reveals NGC 7026 as a young representative of the 'bona fide' planetary nebulae.
Solf Josef
Weinberger Ram
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