The pulsations of PG 1351+489

Autor: Redaelli, Maurício, Kepler, Souza Oliveira, Costa, Jose Eduardo da Silveira, Winget, Donald Earl, Handler, Gerald, Castanheira, Bárbara Garcia, Kanaan Neto, Antonio Nemer, Fraga, Luciano, Henrique, P., Giovannini Junior, Odilon, Provencal, Judith L., Shipman, Harry L., Dalessio, J., Thompson, S. E., Mullally, Fergal, Brewer, M. M., Childers, D., Oksala, M. E., Rosen, Rachel, Wood, Matthew A., Reed, M. D., Walter, B., Strickland, Willie, Chandler, Dean W., Watson, Todd K., Nather, R. Edward, Montgomery, Michael Houston, Bischoff-Kim, Agnès, Hansen, Carl J., Nitta, Atsuko, Kleinman, Scot James, Claver, C.F., Brown, Tim, Sullivan, Denis J., Kim, Seung-Lee, Chen, Wen-Ping, Yang, M., Shih, Chia-You, Zhang, X, Jiang, Xiaojun, Fu, Jianning Ning, Seetha, S., Ashoka, B.N., Marar, T.M. Krishnan, Baliyan, Kiran S., Vats, Hari Om, Chernyshev, A.V., Ibbetson, Peter A., Leibowitz, Elia M., Hemar, Shirley, Sergeev, A., Andreev, M., Janulis, Rimvydas, Meistas, Edmundas G., Moskalik, Pawel, Pajdosz, Gabriel, Baran, Andrzej, Winiarski, M., Zola, Staszek, Ogloza, Waldemar, Siwak, Michal, Bognár, Zsófia, Solheim, Jan-Eric, Sefako, R., Buckley, David A.H., O'Donoghue, Darragh, Nagel, Thorsten, Silvotti, Roberto, Bruni, I., Fremy, J. R., Vauclair, Gérard, Chevreton, Michel, Dolez, Noël, Pfeiffer, Ben, Barstow, Martin A., Creevey, o, Kawaler, Steven D., Clemens, J. Christopher

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

PG 1351+489 is one of the 20DBVs – pulsating helium-atmospherewhite 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 th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::d03745808ee70215fb9b16872abad91c

Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope

Autor: Kurtz, Donald W., Kawaler, Steven D., Riddle, Reed L., Reed, M. D., Cunha, Margarida S., Wood, Matthew A., Silvestri, Nicole M., Watson, Todd K., Dolez, Noël, Moskalik, Pawel, Zola, Staszek, Pallier, E., Guzik, Joyce Ann, Metcalfe, Travis S., Mukadam, Anjum Shagufta, Nather, R. Edward, Winget, Donald Earl, Sullivan, Denis J., Sullivan, Terry, Sekiguchi, Kazuhiro, Jiang, Xiaojun, Shobbrook, Robert R., Ashoka, B.N., Seetha, S., Joshi, Santosh, O'Donoghue, Darragh, Handler, Gerald, Mueller, M., Gonzalez Perez, Jose Miguel, Solheim, Jan-Eric, Johannessen, F., Ulla, Ana, Kepler, Souza Oliveira, Kanaan Neto, Antonio Nemer, Costa, Alex Fabiano Murillo da, Fraga, Luciano, Giovannini Junior, Odilon, Matthews, Jaymie M., WET collaboration

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 and 34.6 μmHz, with a s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::89c69a3060e6f8853061be161d7e06dd

Whole earth telescope observations of am canum venaticorum-discoseismology at last

Autor: Solheim, Jan-Eric, Provencal, Judith L., Bradley, Paul A., Vauclair, Gérard, Barstow, Martin A., Kepler, Souza Oliveira, Fontaine, Gilles, Graver, A.D., Winget, Donald Earl, Marar, T.M. Krishnan, Leibowitz, Elia M., Enanvelsen, P.I., Chevreton, Michel, Dolez, Noël, Kanaan Neto, Antonio Nemer, Bergeron, Pierre, Claver, C.F., Clemens, J. Christopher, Kleinman, Scot James, Hine, B.P., Seetha, S., Shoka, B.N., Mazeh, Tsevi, Sansom, A.E., Tweedy, P.W., Meistas, Edmundas G., Bruvold, A., Massacand, C.N.

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We report the results of 143.2 hours of time-series photometry over a 12 day period for AM CVn (= HZ 29) as part of the Whole Earth Telescope (WET) project.ˡ This star is believed to be an ultra-short period cataclysmic binary. In the temporal spect

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::615c65534c21f235eb060084c7e39864

The unusual helium variable AM Canum Venaticorum

Autor: Provencal, Judith L., Winget, Donald Earl, Nather, R. Edward, Robinson, E.L., Solheim, Jan-Eric, Clemens, J. Christopher, Bradley, Paul A., Kleinman, Scot James, Kanaan Neto, Antonio Nemer, Claver, C.F., Hansen, Carl J., Marar, T.M. Krishnan, Seetha, S., Ashoka, B.N., Leibowitz, Elia M., Meistas, Edmundas G., Bruvold, A., Vauclair, Gérard, Dolez, Noël, Chevreton, Michel, Barstow, Martin A., Sansom, A.E., Tweedy, R.W., Fontaine, Gilles, Bergeron, Pierre, Kepler, Souza Oliveira, Wood, Matthew A., Grauer, Albert D.

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

The unusual variable star AM CVn has puzzled astronomers for over 40 years. This object, both a photometric and spectroscopic variable, is believed to contain a pair of hydrogen-deficient white dwarfs of extreme mass ratio, transferring material via

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::3ef267c4ea275f083dc12124ac0de1b2

Whole Earth Telescope observations and seismological analysis of the pre-white dwarf pg 2131+066

Autor: Kawaler, Steven D., O'Brien, M. Sean, Clemens, J. Christopher, Nather, R. Edward, Winget, Donald Earl, Watson, Todd K., Yanagida, K., Dixson, James S., Bradley, Paul A., Wood, Matthew A., Sullivan, Denis J., Kleinman, Scot James, Meistas, Edmundas G., Leibowitz, Elia M., Moskalik, Pawel, Zola, Staszek, Pajdosz, Y., Krzesinski, Jerzy, Solheim, Jan-Eric, Bruvold, A., O'Donoghue, Darragh, Katz, M., Vauclair, Gérard, Dolez, Noël, Chevreton, Michel, Barstow, Martin A., Kanaan Neto, Antonio Nemer, Kepler, Souza Oliveira, Giovannini Junior, Odilon, Provencal, Judith L., Hansen, Carl J.

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

As transition objects between the asymptotic giant branch (AGB) and cooling white dwarfs, the PG 1159 stars are key objects for understanding the late stages of stellar evolution. The pulsations exhibited by many members of the PG 1159 spectral class

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::c70b78e992e97945435df4721ddb115f