The structures of and distances to BD +30 deg 3639 and NGC 6572

Details The structures of and distances to BD +30 deg 3639 and NGC 6572 The structures of and distances to BD +30 deg 3639 and NGC 6572

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..243m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 243-250.

Astronomy and Astrophysics

Astrophysics

68

Planetary Nebulae, Stellar Evolution, Interstellar Matter, Luminosity, Optical Thickness, Radiant Flux Density, Velocity Distribution, Very Large Array (Vla)

Scientific paper

New high-resolution VLA maps of the dense planetary nebulae BD +30 deg 3639 and NGC 6572 are presented. A prolate-ellipsoidal model was used to account for the appearance of these nebulae in quantitative detail, along with a recently developed technique of measuring expansion motions with the VLA to determine the distances to these dense planetary nebulae. Both nebulae have significantly greater distances than previously expected: 2.8 + 47.0 or - 1.2 kpc is the estimated distance to BD +30 deg 3639, and 1.7 + 6.1 or - 0.8 kpc is the one to NGC 6572. The upward revision of the distance, has important implications for the state of the nebulae, reducing their calculated densities and increasing their luminosities. The discrepancy between the new distances for dense nebulae and those calculated from statistical assumptions casts some doubt on the use of statistical methods for such objects. Luminous, optically thick nebulae may have been systematically undercounted, thus affecting studies of mass return to the interstellar medium and of the evolution of central stars.

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