The distance to the planetary nebula NGC 7027

Details The distance to the planetary nebula NGC 7027 The distance to the planetary nebula NGC 7027

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..229p&link_type=abstract

Astronomy and Astrophysics, vol. 106, no. 2, Feb. 1982, p. 229-234. Research supported by the Rijksuniversiteit te Groningen.

Astronomy and Astrophysics

Astrophysics

46

Absorption Spectra, Centimeter Waves, Distance, H Beta Line, Planetary Nebulae, Radio Waves, Forbidden Bands, Intergalactic Media, Interstellar Matter, Milky Way Galaxy, Radiant Flux Density, Stellar Evolution, Thermal Emission

Scientific paper

Various direct methods for determining the distance to NGC 7027 are discussed. The first, 21 cm absorption in the intervening material, is shown to give very clear limits to the distance. These limits are still further sharpened by two other methods: a comparison of the intrinsic H-beta luminosities of NGC 7027 and extragalactic planetary nebulae; and a comparison of the density determined by H beta flux, which is dependent on the distance, with the density as determined by forbidden lines and radio recombination lines, which is not distance dependent. The result is a distance of between 1 and 1.5 kpc.

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