A self-consistent determination of the distances, physical parameters, and chemical composition for a large sample of galactic planetary nebulae: The distances and parameters of central stars and the optical depths of envelopes

Details A self-consistent determination of the distances, physical parameters, and chemical composition for a large sample of galactic planetary nebulae: The distances and parameters of central stars and the optical depths of envelopes A self-consistent determination of the distances, physical parameters, and chemical composition for a large sample of galactic planetary nebulae: The distances and parameters of central stars and the optical depths of envelopes

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arep...41..760m&link_type=abstract

Astronomy Reports, Volume 41, Issue 6, November 1997, pp.760-776

Astronomy and Astrophysics

Astronomy

14

Scientific paper

The distances and parameters of the central stars and the optical depths of the envelopes in the Lyman limits of neutral hydrogen and neutral helium were determined in a self-consistent way for 170 Galactic planetary nebulae (PNe). The distance to each PN was so chosen that the theoretically calculated evolutionary age of its nucleus was equal to the dynamical age of its expanding envelope. The effective temperature of the central star and its related parameters were determined either by the generalized energy-balance method or, where appropriate, by Zanstra's method. The derived distance estimates lend support to a `long' distance scale for PNe and are generally in agreement with current individual and statistical estimates of the distances to PNe available in the literature. The mean distance to the bulge PNe is 7.9 +/- 0.3 kpc, in agreement with the distance to the Galactic center. The masses of the central stars of PNe corresponding to the derived distances are closely correlated with the nebular nitrogen-to-oxygen abundance ratio.

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