Statistics – Computation
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.107...19a&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 107, no. 1, Dec. 1984, p. 19-50.
Statistics
Computation
55
Astrometry, Mass Distribution, Milky Way Galaxy, Planetary Nebulae, Statistical Analysis, Stellar Evolution, Binary Stars, Computational Astrophysics, Distance, Electron Density (Concentration), Mass To Light Ratios, Spatial Distribution, White Dwarf Stars
Scientific paper
A new empirical scale of distances to planetary nebulae (PNs) is presented based on the interdependence between the PN diameter and the value of the surface brightness in the radio range. The dependence of the mean electron density in PNs on the diameter is determined, and the masses of the ionized matter in PNs are estimated. The variation of the properties of PNs as a function of the type of stellar population to which they belong is investigated, and the frequency of PN formation in the Galaxy is evaluated and compared with that of white dwarf formation. Finally, the dependence of the PN expansion velocity on linear size is defined.
Amnuél' P. R.
Guseinov Kh. O.
Novruzova Kh. I.
Rustamov Iu. S.
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