The structure of NGC 7027 and a determination of its distance by measurement of proper motions

Details The structure of NGC 7027 and a determination of its distance by measurement of proper motions The structure of NGC 7027 and a determination of its distance by measurement of proper motions

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..294m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 294-303. Research supported by Dudley Observatory.

Astronomy and Astrophysics

Astrophysics

101

Planetary Nebulae, Stellar Evolution, Stellar Luminosity, Astronomical Maps, Astronomical Models, Brightness Distribution, Ionized Gases, Very Large Array (Vla)

Scientific paper

Radio observations of the PN NGC 7027, obtained at 4.885 and 14.965 GHz (resolution 0.35 arcsec) using the B configuration of the VLA in 12-h runs during August 1982, May 1985, and September 1986, are reported. The data-reduction procedures are outlined, and the results are presented in tables, graphs, and contour maps. Extreme limb brightening is observed and attributed to inverse-square dilution of ionizing radiation from the central star. Comparison of the maps from three epochs reveals steady expansion and implies a distance of 880 + or - 150 pc.

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