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. WoodM. 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, J. C. Clemens

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Abstract

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 489.33448s 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 8.9h, and discuss a possible determination of the rate of period change of (2.0 ± 0.9) × 10-13ss -1, the first such estimate for a DBV.

Original languageEnglish (US)
Pages (from-to)1220-1227
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume415
Issue number2
DOIs
StatePublished - Aug 1 2011

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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., ... Clemens, J. C. (2011). The pulsations of PG 1351+489. Monthly Notices of the Royal Astronomical Society, 415(2), 1220-1227. https://doi.org/10.1111/j.1365-2966.2011.18743.x