The cool ZZ Ceti star PG 2303+243: observations and analysis of variability in 2004
Abstract
PG 2303+243 is a cool DA variable (also called ZZ Ceti) star with a rich pulsation spectrum and variable amplitudes. A mini-campaign involving six observatories yielded time-resolved photometric measurements of PG 2303+243 during the period 2004 September 5-20. A duty cycle of 35 per cent was achieved. We detected 24 possible independent frequencies, their amplitudes and phases for future mode identification. We confirm the occurrence of short-term amplitude and frequency variations. Our analysis suggests an l= 1 rotational splitting around 8.4 μHz, implying a rotation period of 16.5 h.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2011
- DOI:
- 10.1111/j.1365-2966.2011.18781.x
- Bibcode:
- 2011MNRAS.415.1322P
- Keywords:
-
- stars: individual: PG 2303+243;
- stars: variables: general;
- white dwarfs