Pulsating white dwarf
ZZ Ceti stars (ZZ Ceti objects, ZZ Ceti variables) are non-radially pulsating white dwarfs with periods between 30 s to 25 min. They are found in a rather narrow range of effective temperature, between about 12,500 and 11,100 K.[1] There are three types of ZZ Ceti stars[2]:
| ZZA | DA spectral type, having only hydrogen absorption lines in their spectra |
| ZZB | DB spectral type having only helium absorption lines in their spectra |
| ZZO | DO spectral type showing He II and C IV absorption lines in their spectra |
Notes
- ^ Bergeron, P. "On the Purity of the ZZ Ceti Instability Strip: Discovery of More Pulsating DA White Dwarfs on the Basis of Optical Spectroscopy". The Astrophysical Journal. Retrieved 2007-06-06.
{{cite web}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ "ZZ Ceti variables". Centre de
Données astronomiques de Strasbourg. Retrieved 2007-06-06.
{{cite web}}: Cite has empty unknown parameter:|coauthors=(help); line feed character in|publisher=at position 10 (help)
See also
External links
 | This variable star–related article is a stub. You can help Wikipedia by expanding it. |