Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..97..305g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 97, no. 2, Dec. 1983, p. 305-322.
Astronomy and Astrophysics
Astrophysics
20
Helium, Stellar Evolution, Stellar Mass, Stellar Spectrophotometry, Stellar Temperature, White Dwarf Stars, Abundance, Atmospheric Composition, Kinematics, Mass Distribution, Space Density, Stellar Atmospheres
Scientific paper
The temperatures, radii, and masses of 81 He-rich white dwarfs are calculated from photometric data. It is shown that, on the average, they are less massive than DA white dwarfs; 70 percent of He-rich white dwarfs have masses of less than 0.55 solar mass. Space density and birth-rate for different mass groups of H-rich and He-rich white dwarfs are obtained. Birth-rate is 1 x 10 to the -12th/cu pc yr and 1.5 x 10 to the -12th/cu pc yr for He-rich and H-rich white dwarfs, respectively. The mean mass of nascent white dwarfs is about 0.55 solar mass. It is shown that VT and its dispersion sigma are correlated with the mass of white dwarfs, and from this progenitors' masses - of different mass groups of white dwarfs are estimated.
Guseinov Kh. O.
Novruzova Kh. I.
Rustamov Iu. S.
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