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White Dwarfs and Planetary Central Stars
| Content Provider | Scilit |
|---|---|
| Author | Liebert, James |
| Copyright Year | 1989 |
| Description | Studies of hot white dwarf samples constrain the properties and evolution of planetary nuclei and the nebulae. In particular, the white dwarf and planetary nebulae formation rates are compared. I discuss the overlap of the sequences of white dwarfs having hydrogen (DA) and helium-rich (DO) atmospheres with known central stars of high surface gravity. There is evidence that the hydrogen atmosphere nuclei have “thick” outer hydrogen layers (≳ $10^{−4}$ $M_{⊙}$), but that DA white dwarfs may have surface hydrogen layers orders of magnitude thinner. Finally, a DA planetary nucleus is discussed (0950+139) which has undergone a late nebular ejection; this object may be demonstrating that a hydrogen layer can be lost even after the star has entered the white dwarf cooling sequence. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/F29FE2DF9084B6F87923D7A28F2D6426/S0074180900139166a.pdf/div-class-title-white-dwarfs-and-planetary-central-stars-div.pdf |
| Ending Page | 554 |
| Page Count | 10 |
| Starting Page | 545 |
| ISSN | 00741809 |
| DOI | 10.1017/s0074180900139166 |
| Journal | Symposium - International Astronomical Union |
| Volume Number | 131 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 1989-01-01 |
| Access Restriction | Open |
| Subject Keyword | International Astronomical Union Astronomy and Astrophysics White Dwarf Hydrogen Layers |
| Content Type | Text |
| Resource Type | Article |
