Bibcode
Redaelli, M.; Kepler, S. O.; Costa, J. E. S.; Winget, D. E.; Handler, G.; Castanheira, B. G.; Kanaan, A.; Fraga, L.; Henrique, P.; Giovannini, O.; Provencal, J. L.; Shipman, H. L.; Dalessio, J.; Thompson, S. E.; Mullally, F.; Brewer, M. M.; Childers, D.; Oksala, M. E.; Rosen, R.; Wood, M. A.; Reed, M. D.; Walter, B.; Strickland, W.; Chandler, D.; Watson, T. K.; Nather, R. E.; Montgomery, M. H.; Bischoff-Kim, A.; Hansen, C. J.; Nitta, A.; Kleinman, S. J.; Claver, C. F.; Brown, T. M.; Sullivan, D. J.; Kim, S.-L.; Chen, W.-P.; Yang, M.; Shih, C.-Y.; Zhang, X.; Jiang, X.; Fu, J. N.; Seetha, S.; Ashoka, B. N.; Marar, T. M. K.; Baliyan, K. S.; Vats, H. O.; Chernyshev, A. V.; Ibbetson, P.; Leibowitz, E.; Hemar, S.; Sergeev, A. V.; Andreev, M. V.; Janulis, R.; Meištas, E. G.; Moskalik, P.; Pajdosz, G.; Baran, A.; Winiarski, M.; Zola, S.; Ogloza, W.; Siwak, M.; Bognár, Zs.; Solheim, J.-E.; Sefako, R.; Buckley, D.; O'Donoghue, D.; Nagel, T.; Silvotti, R.; Bruni, I.; Fremy, J. R.; Vauclair, G.; Chevreton, M.; Dolez, N.; Pfeiffer, B.; Barstow, M. A.; Creevey, O. L.; Kawaler, S. D.; Clemens, J. C.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 415, Issue 2, pp. 1220-1227.
Advertised on:
8
2011
Citations
15
Refereed citations
12
Description
PG 1351+489 is one of the 20 DBVs - pulsating helium-atmosphere white
dwarf stars - known and has the simplest power spectrum for this class
of star, making it a good candidate to study cooling rates. We report
accurate period determinations for the main peak at 489.334 48 s and two
other normal modes using data from the Whole Earth Telescope (WET)
observations of 1995 and 2009. In 2009, we detected a new pulsation mode
and the main pulsation mode exhibited substantial change in its
amplitude compared to all previous observations. We were able to
estimate the star's rotation period, of 8.9 h, and discuss a possible
determination of the rate of period change of (2.0 ± 0.9) ×
10-13 s s -1, the first such estimate for a DBV.