High-frequency optical variables. II. Luminosity-variable white dwarfs and maximum entropy spectral analysis.
In a search for luminosity-variable white dwarf stars, two new periodic variables were found, EG 65 (Gi 17 - BiSA) and EG 197 (G169 - 34). The former has a period of 1311 5 while the latter varies on a time scale of 465 5. Using EG 65 as a typical variable of this class of stars, we show that the burning of hydrogen accreted from the interstellar medium can account for the energy needed to keep the star in oscillation. Maximum entropy power spectral analysis, which was used to identify the 1311-s period, is discussed in an appendix. Subject headings: pulsation - variable stars - white dwarf stars
The Astrophysical Journal
- Pub Date:
- September 1974