Kinematics and morphology of the planetary nebula A 78 - A model

Details Kinematics and morphology of the planetary nebula A 78 - A model Kinematics and morphology of the planetary nebula A 78 - A model

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.237..611p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 237, April 1, 1989, p. 611-620.

Astronomy and Astrophysics

Astronomy

4

Planetary Nebulae, Velocity Distribution, Brightness Distribution, Fabry-Perot Interferometers, H Alpha Line, Morphology, Sky Surveys (Astronomy)

Scientific paper

The planetary nebula A 78 is known to exhibit structure and expansion velocities which are strikingly different in different spectral lines. Photographic Fabry-Perot interferometry and direct imaging in the H-alpha line have yielded a significant velocity structure. A confrontation of the velocity field obtained at 88 points, with the H-alpha image, together with the filamentary details of A 78 on PSS red plates, has led to the conclusion that the formation of the nebula has not been isotropic: it is essentially the product of collimated outflow from a region 8 deg at the far side of the equator of a rotating object with its axis inclined to the line-of-sight by 21 deg. The outflow velocity in H-alpha is about 27 km/s.

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