Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-22
Mon.Not.Roy.Astron.Soc.Lett. 370 (2006) L56-L60
Astronomy and Astrophysics
Astrophysics
5 pages, 6 figures, 2 tables, accepted for publication in MNRAS Letters
Scientific paper
10.1111/j.1745-3933.2006.00188.x
The number of discovered non-radially pulsating white dwarfs (WDs) in cataclysmic variables (CVs) is increasing rapidly by the aid of the Sloan Digital Sky Survey (SDSS). We performed photometric observations of two additional objects, SDSS J133941.11+484727.5 (SDSS 1339), independently discovered as a pulsator by Gansicke et al., and SDSS J151413.72+454911.9, which we identified as a CV/ZZ Ceti hybrid. In this Letter we present the results of the remote observations of these targets performed with the Nordic Optical Telescope (NOT) during the Nordic-Baltic Research School at Moletai Observatory, and follow-up observations executed by NOT in service mode. We also present 3 candidates we found to be non-pulsating. The results of our observations show that the main pulsation frequencies agree with those found in previous CV/ZZ Ceti hybrids, but specifically for SDSS 1339 the principal period differs slightly between individual observations and also from the recent independent observation by Gansicke et al. Analysis of SDSS colour data for the small sample of pulsating and non-pulsating CV/ZZ Ceti hybrids found so far, seems to indicate that the r-i colour could be a good marker for the instability strip of this class of pulsating WDs.
Nilsson Ricky
Solheim Jan-Erik
Uthas Helena
Warner Brian
Ytre-Eide M.
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