Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.113...59a&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 113, no. 1, July 1985, p. 59-81.
Astronomy and Astrophysics
Astrophysics
8
Far Ultraviolet Radiation, Planetary Nebulae, Stellar Evolution, Stellar Mass, Stellar Temperature, Chromosphere, Diameters, Mass Distribution, Red Giant Stars, Stellar Magnitude, White Dwarf Stars
Scientific paper
On the basis of data on planetary nebula (PN) central star temperatures obtained by measurements in the ultraviolet (UV) range, the empirical calibration dependence between the number of Lyman photons emitted by a central star S' and PN diameter D, is constructed. The temperatures of 118 PN central stars are estimated with this dependence. It is shown that the central star masses are distributed in a wide interval from ≈0.5 to ≈1.2 M_sun;. The averaged empirical tracks of evolution of low-mass (<0.6 M_sun;) and massive (>0.6 M_sun;) central stars differing considerably from each other are constructed. The PN originates as a result of ionization of the matter ejected by a red giant at the superwind stage. The cause for this ionization is the UV radiation of the PN central star.
Amnuél' P. R.
Guseinov Kh. O.
Novruzova Kh. I.
Rustamov Iu. S.
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