The proper motion distance to the remarkable bipolar planetary nebula KjPn 8

Details The proper motion distance to the remarkable bipolar planetary nebula KjPn 8 The proper motion distance to the remarkable bipolar planetary nebula KjPn 8

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292l..11m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. L11-L14

Astronomy and Astrophysics

Astronomy

13

Planetary Nebulae, Distance, Motion, Kinematics, Astronomical Photography

Scientific paper

The expansion proper motions of the high-speed groups of knots A1 and A2 at the tips of the inner bipolar lobes of the extraordinary bipolar nebula KjPn 8 have been measured as 34 +/- 3 mas/yr by comparing their images on a Palomar Observatory Sky Survey 1954 plate with one taken in 1991. This value has been used within a bowshock model for the generation of the emission line knots to derive a distance to KjPn 8 of D = 1600 +/- 230 pc. A kinematical age of T = 3400 +/- 300 yr for the two groups of knots is given directly by this measurement of proper motion and the 115-arcsec projected angular distance of the knots from the nebular core.

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