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He-rich white dwarfs: Birth-rate and kinematics of different groups of white dwarfs

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Abstract

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% of He-rich white dwarfs have masses<0.55M ⊙. Space density and birth-rate for different mass groups of H-rich and He-rich white dwarfs are obtained. Birth-rate is 1×10−12 pc−3 yr−1 and 1.5×10−12pc−3yr−1 for He-rich and H-rich white dwarfs, respectively. The mean mass of nascent white dwarfs is about 0.55M ⊙. It is shown thatV Tand its dispersion σ are correlated with the mass of white dwars, and from this progenitors' masses — of different mass groups of white dwarfs are estimated.

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Authors and Affiliations

  1. Institute of Physics, Baku, U.S.S.R.

    O. H. Guseinov, H. I. Novruzova & Yu. S. Rustamov

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  1. O. H. Guseinov
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  2. H. I. Novruzova
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  3. Yu. S. Rustamov
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Guseinov, O.H., Novruzova, H.I. & Rustamov, Y.S. He-rich white dwarfs: Birth-rate and kinematics of different groups of white dwarfs. Astrophys Space Sci 97, 305–322 (1983). https://doi.org/10.1007/BF00653488

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