Constraining the Evolution of ZZ Ceti

Autor: Mukadam A. S., Kepler S. O., Winget D. E., Nather R. E., Kilic M., Mullally F., Hippel T. von, Kleinman S. J., Nitta A., Guzik J. A., Bradley P. A., Matthews J., Sekiguchi K., Sullivan D. J., Shobbrook R. R., Birch P., Jiang X. J., Xu D. W., Joshi S., Ashoka B.N., Ibbetson P., Leibowitz E., Ofek E. O., Meištas E. G., Janulis R., Ališauskas D., Kalytis R., Handler G., Kilkenny D., O’Donoghue D., Kurtz D. W., Müller M., Moskalik P., Ogłoza W., Zoła S., Krzesiński J., Johannessen F., Gonzalez-Perez J. M., Solheim J-E., Silvotti R., Bernabei S., Vauclair G., Dolez N., Fu J. N., Chevreton M., Manteiga M., Súarez O., Ulla A., Cunha M. S., Metcalfe T. S., Kanaan A., Fraga L., Costa A. F. M., Giovannini O., Fontaine G., Bergeron P., O’Brien M. S., Sanwal D., Wood M. A., Ahrens T. J., Silvestri N., Klumpe E. W., Kawaler S. D., Riddle R., Reed M. D., Watson T. K.

Publikováno v: Open Astronomy, Vol 12, Iss 1, Pp 71-103 (2003)

We report our analysis of the stability of pulsation periods in the DAV star (pulsating hydrogen atmosphere white dwarf) ZZ Ceti, also called R548. Based on observations that span 31 years, we conclude that the period 213.132605 s observed in ZZ Ceti

Externí odkaz: https://doaj.org/article/2f43468678c44bc7b5f349f3b424d8fd

Empirical Determination of Convection Parameters in White Dwarfs I : Whole Earth Telescope Observations of EC14012-1446

Autor: Provencal, J. L., Montgomery, M. H., Kanaan, A., Thompson, S. E., Dalessio, J., Shipman, H. L., Childers, D., Clemens, J. C., Rosen, R., Henrique, P., Bischoff-Kim, A., Strickland, W., Chandler, D., Walter, B., Watson, T. K., Castanheira, B., Wang, S., Handler, G., Wood, M., Vennes, S., Nemeth, P., Kepler, S. O., Reed, M., Nitta, A., Kleinman, S. J., Brown, T., Kim, S. -L., Sullivan, D., Chen, Wen-Ping, Yang, M., Shih, Chia-You, Jiang, X. J., Sergeev, A. V., Maksim, A., Janulis, R., Baliyan, K. S., Vats, H. O., Zola, S., Baran, A., Winiarski, M., Ogloza, W., Paparo, M., Bognar, Z., Papics, P., Kilkenny, D., Sefako, R., Buckley, D., Loaring, N., Kniazev, A., Silvotti, R., Galleti, S., Nagel, T., Vauclair, G., Dolez, N., Fremy, J. R., Perez, J., Almenara, J. M., Fraga, L.

We report on analysis of 308.3 hrs of high speed photometry targeting the pulsating DA white dwarf EC14012-1446. The data were acquired with the Whole Earth Telescope (WET) during the 2008 international observing run XCOV26. The Fourier transform of

Externí odkaz: http://arxiv.org/abs/1204.2558

Further Evidence for Variable Synchrotron Emission in XTE J1118+480 in Outburst

Autor: Hynes, R. I., Robinson, E. L., Pearson, K. J., Gelino, D. M., Cui, W., Xue, Y., Wood, M. A., Watson, T. K., Winget, D. E., Silver, I. M.

Publikováno v: Astrophys.J.651:401-407,2006

We present simultaneous multicolor infrared and optical photometry of the black hole X-ray transient XTE J1118+480 during its short 2005 January outburst, supported by simultaneous X-ray observations. The variability is dominated by short timescales,

Externí odkaz: http://arxiv.org/abs/astro-ph/0607314

Understanding the Cool DA White Dwarf, G29-38

Autor: Kleinman, S. J., Nather, R. E., Winget, D. E., Clemens, J. C., Bradley, P. A., Kanaan, A., Provencal, J. L., Claver, C. F., Watson, T. K., Yanagida, K., Nitta, A., Dixson, J. S., Wood, M. A., Grauer, A. D., Hine, B. P., Fontaine, G., Liebert, James, Sullivan, D. J., Wickramasinghe, D. T., Marar, N. Achilleos. T. M. K., Seetha, S., Ashoka, B. N., Meistas, E., Leibowitz, E. M., Moskalik, P., Krzesinski, J., Solheim, J. -E., Bruvold, A., Kurtz, D. W., Warner, B., Martinez, Peter, Vauclair, G., Dolez, N., Chevreton, M., Barstow, M. A., Kepler, S. O., Giovannini, O., Augusteijn, T., Hansen, C. J., Kawaler, S. D.

Publikováno v: Astrophys.J.495:424-434,1998

The white dwarfs are promising laboratories for the study of cosmochronology and stellar evolution. Through observations of the pulsating white dwarfs, we can measure their internal structures and compositions, critical to understanding post main seq

Externí odkaz: http://arxiv.org/abs/astro-ph/9711123

The pulsations of PG 1351+489

Autor: Redaelli, M., Kepler, S. O., Costa, José Eduardo, Winget, D. E., Handler, Gerald, Castanheira, B. G., Kanaan, A., Fraga, L., Henrique, P., Giovannini, O., Provençal, J. L., Shipman, H. L., Dalessio, J., Thompson, S. E., Mullally, Fergal, Brewer, M. M., Childers, D., Oksala, Mary 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, Candice J., Nitta, A., Kleinman, S. J., Claver, C. F., Brown, Timothy M., Sullivan, D. J., Kim, S.-L., Chen, Wen-Ping, Yang, M., Shih, C.-Y., Zhang, X., Jiang, X., Fu, J.-N., Seetha, S., Ashoka, B. N., Marar, T. M. K., Baliyan, Kiran S., Vats, H. O., Chernyshev, A. V., Ibbetson, P., Leibowitz, E. M., Hemar, S., Sergeev, A. V., Andreev, M. V., Janulis, R., Meistas, E. G., Moskalik, P. A., Pajdosz, G., Baran, A., Winiarski, M., Zola, S., Ogloza, W., Siwak, M., Bognar, Zs., Solheim, J.-E., Sefako, R., Buckley, D., O'Donoghue, Darragh, Nagel, T., Silvotti, R., Bruni, I., Fremy, Jean-René, Vauclair, Gérard, Chevreton, Michel, Dolez, N., Pfeiffer, B., Barstow, Martin A., Creevey, Orlagh L., Kawaler, Steven D., Clemens, J. C.

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2011, 415, pp.1220-1227. ⟨10.1111/j.1365-2966.2011.18743.x⟩

International audience; 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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::310d5511bbc07cb914f5c22ef68892e0
https://hal.science/hal-03732498/file/mnras0415-1220.pdf