The Sigma-D Relation for Planetary Nebulae: Preliminary Analysis

Details The Sigma-D Relation for Planetary Nebulae: Preliminary Analysis The Sigma-D Relation for Planetary Nebulae: Preliminary Analysis

2007-04-03

arxiv.org/abs/0704.0421v3

Serb. Astron. J., vol. 174, p. 73-76 (2007)

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

10.2298/SAJ0774073U

An analysis of the relation between radio surface brightness and diameter, so-called Sigma-D relation, for planetary nebulae (PNe) is presented: i) the theoretical Sigma-D relation for the evolution of bremsstrahlung surface brightness is derived; ii) contrary to the results obtained earlier for the Galactic supernova remnant (SNR) samples, our results show that the updated sample of Galactic PNe does not severely suffer from volume selection effect - Malmquist bias (same as for the extragalactic SNR samples) and; iii) we conclude that the empirical Sigma-D relation for PNe derived in this paper is not useful for valid determination of distances for all observed PNe with unknown distances.

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