Journal Article

The pulsations of PG 1351+489

M. Redaelli, S. O. Kepler, J. E. S. Costa, D. E. Winget, G. Handler, B. G. Castanheira, A. Kanaan, L. Fraga, P. Henrique, O. Giovannini, J. L. Provencal, H. L. Shipman, J. Dalessio, S. E. Thompson, F. Mullally, M. M. Brewer, D. Childers, M. E. Oksala, R. Rosen, M. A. Wood, M. D. Reed, B. Walter, W. Strickland, D. Chandler, T. K. Watson, R. E. Nather, M. H. Montgomery, A. Bischoff-Kim, C. J. Hansen, A. Nitta, S. J. Kleinman, C. F. Claver, T. M. Brown, D. J. Sullivan, S.-L. Kim, W.-P. Chen, M. Yang, C.-Y. Shih, X. Zhang, X. Jiang, J. N. Fu, S. Seetha, B. N. Ashoka, T. M. K. Marar, K. S. Baliyan, H. O. Vats, A. V. Chernyshev, P. Ibbetson, E. Leibowitz, S. Hemar, A. V. Sergeev, M. V. Andreev, R. Janulis, E. G. Meištas, P. Moskalik, G. Pajdosz, A. Baran, M. Winiarski, S. Zola, W. Ogloza, M. Siwak, Zs. Bognár, J.-E. Solheim, R. Sefako, D. Buckley, D. O'Donoghue, T. Nagel, R. Silvotti, I. Bruni, J. R. Fremy, G. Vauclair, M. Chevreton, N. Dolez, B. Pfeiffer, M. A. Barstow, O. L. Creevey, S. D. Kawaler and J. C. Clemens

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 2, pages 1220-1227
Published in print August 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18743.x
The pulsations of PG 1351+489

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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.

Keywords: stars: evolution; stars: individual: PG 1351+489; stars: oscillations; white dwarfs

Journal Article.  4210 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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