Episodic symmetric jets in the planetary nebula FG 1

Details Episodic symmetric jets in the planetary nebula FG 1 Episodic symmetric jets in the planetary nebula FG 1

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..194l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 194-198.

Astronomy and Astrophysics

Astronomy

36

Astronomical Spectroscopy, Infrared Astronomy Satellite, Planetary Nebulae, Radio Jets (Astronomy), Ellipticity, Point Sources, Protoplanets

Scientific paper

Deep CCD imaging and long-slit spectrosgopy have been obtained for the planetary nebula Fg 1. The discovery of a symmetric jet-like structure, consisting of two strings of ionized nebular knots, highly reminiscent of Herbig-Haro objects is reported. The strings are bent in opposite directions and span 2 arcmin to either side of the PN. The main body of Fg 1 consists of an orthogonal system of elliptical structures. The major axis size for the brighter of these structures is about 38 arcsec. The generatrix of the strings has as vertix the central star and coincides with the minor axis of the bright elliptical structure. The spectra from the opposite innermost bright knots, intersected by the slit, show opposite sign velocities, indicating an expansion radial velocity of 43 km/s and line ratios typical of collisionally excited gas. A velocity difference of about 33 km/s is measured from the southern to the northern side of the main body of the PN. The pairs of opposite knots that make up the strings are symmetric and equidistant with respect to the planetary nebula nucleus (PNN). These knots are interpreted as multiple ansae that have been formed and blown away in episodic events by symmetric, collimated flows probably produced by a precessing source. It is estimated that the outermost ansae system was produced between 3.42 x 10 exp 4 and 1.34 x 10 exp 4 years ago, when Fg 1 was in proto-planetary stage.

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