Planetary nebulae expansion distances

Details Planetary nebulae expansion distances Planetary nebulae expansion distances

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1965h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1965-1972

Astronomy and Astrophysics

Astronomy

53

Angular Resolution, Distance, Expansion, Planetary Nebulae, Time Measurement, Astronomical Maps, Astronomical Models, Doppler Effect, Radio Stars, Velocity, Very Large Array (Vla)

Scientific paper

We present two epochs of lambda 6 cm Very Large Array (VLA) maps of the planetary nebulae NGC 7027 and BD+30-3639 with subarsecond angular resolution. By taking advantage of the high dynamic range possible with the VLA as well as the almost 6 yr time baseline between the two epochs, we have constructed difference maps that show the signature characteristic of the radial expansion of the ionization front surrounding the nebulae. We have combined these results with the Doppler expansion velocities to estimate the distance to both objects. Our results indicate that DNGC 7027 = 703 +/- 95 pc and DBD+30 = 2680 +/- 810 pc.

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