The pulsations of PG 1351+489
Matteo RedaelliInstituto de Fsica da Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, BrazilS. O. KeplerInstituto de Fsica da Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, BrazilJ. E. S. CostaInstituto de Fsica da Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, BrazilD. E. WingetDepartment of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712, USAG. HandlerInstitut fr Astronomie, Universitt Wien, Trkenschanzstrae 17, 1180 Wien, AustriaB. G. CastanheiraInstituto de Física, Universidade Federal do Rio Grande do Sul (91501-970 Porto Alegre, RS - Brazil)A. KanaanDepartamento de Fsica, Universidade Federal de Santa Catarina, 88040-900 Florianpolis, SC, BrazilL. FragaSouthern Observatory for Astrophysical Research, Casilla 603, La Serena, ChileP. HenriqueDepartamento de Fsica, Universidade Federal de Santa Catarina, 88040-900 Florianpolis, SC, BrazilO. GiovanniniDepartamento de Fsica e Qumica, Universidade de Caxias do Sul, 95070-560 Caxias do Sul, RS, BrazilJ. L. ProvençalDelaware Asteroseismic Research Center, Mt Cuba Observatory, Greenville, DE 19807, USAH. L. ShipmanUniversity of Delaware, Department of Physics and Astronomy Newark, DE 19716, USAJ. DalessioUniversity of Delaware, Department of Physics and Astronomy Newark, DE 19716, USASusan E. ThompsonDelaware Asteroseismic Research Center, Mt Cuba Observatory, Greenville, DE 19807, USASusan E. MullallySETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USAMike BrewerWilliam Jewell College, 500 College Hill Liberty, MO 64048, USADaniel P. ChildersDepartment of Math and Science, Delaware County Community College, 901 S. Media Road, Media, USAM. E. OksalaBartol Research Institute, University of Delaware, Newark, Delaware, USAR. RosenNational Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USAM. A. WoodFlorida Institute of Technology, Department of Physics and Space Sciences, Melbourne, FL 32901, USAM. D. ReedMissouri State University and Baker Observatory, 901 S. National, Springfield, MO 65897, USAB. WalterMeyer Observatory and Central Texas Astronomical Society, Waco, TX, USAW. StricklandMeyer Observatory and Central Texas Astronomical Society, Waco, TX, USADavid W. ChandlerMeyer Observatory and Central Texas Astronomical Society, Waco, TX, USAT. K. WatsonSouthwestern University, Georgetown, TX, USAR. E. NatherDepartment of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712, USAΜ. H. MontgomeryDepartment of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712, USAA. Bischoff‐KimDepartment of Chemistry, Physics and Astronomy, Georgia College & State University, Milledgeville, GA, USAC. J. HansenJILA, University of Colorado, Boulder, CO, USAA. NittaGemini Observatory, 670 N A'ohoku PI., Hilo, HI 96720, USAS. J. KleinmanGemini Observatory, 670 N A'ohoku PI., Hilo, HI 96720, USAC. F. ClaverKitt Peak National Observatory, National Optical Astronomy Observatory, Tucson, AZ, USAT. M. BrownLas Cumbres Observatory Global Telescope Network, Inc., 6740 Cortona Drive Suite 102, Santa Barbara, CA 93117, USAD. J. SullivanVictoria University of Wellington, Wellington, New ZealandS.-L. KimKorea Astronomy and Space Science Institute, Daejeon 305-348, KoreaW.-P. ChenLulin Observatory, National Central University, TaiwanMing YangLulin Observatory, National Central University, TaiwanC. ShihLulin Observatory, National Central University, TaiwanXiaowan ZhangNational Astronomical Observatories, Beijing 100012, ChinaXiaojun JiangNational Astronomical Observatories, Beijing 100012, ChinaJian-Ning FuDepartment of Astronomy, Beijing Normal University, Beijing, ChinaS. SeethaIndian Space Research Organization (Indian Space Research Organization, Airport Road, Vimanapura PO, Bangalore 560017, India - India)Β. N. AshokaIndian Space Research Organization, Airport Road, Vimanapura PO, Bangalore 560017, IndiaΤ. Μ. K. MararIndian Space Research Organization, Airport Road, Vimanapura PO, Bangalore 560017, IndiaK. S. BaliyanPhysical Research Laboratory, Ahmedabad 380009, IndiaHari Om VatsPhysical Research Laboratory, Ahmedabad 380009, IndiaА. В. ЧернышевAstronomical Institute, Astronomicheskaya 33, Tashkent, UzbekistanP. IbbetsonWise Observatory, Tel Aviv University, Tel Aviv, IsraelE. LeibowitzSchool of Physics and Astronomy and the Wise Observatory, Tel Aviv University, Tel Aviv, IsraelShirley HemarSchool of Physics and Astronomy and the Wise Observatory, Tel Aviv University, Tel Aviv, IsraelА. В. СергеевUkranian National Academy of Sciences, Main Astronomical Observatory, Golosiiv, Kiev 022 252650, UkraineM. AndreevUkranian National Academy of Sciences, Main Astronomical Observatory, Golosiiv, Kiev 022 252650, UkraineR. JanulisInstitute of Theoretical Physics and Astronomy, Vilnius University, Vilnius, LithuaniaE. G. MeištasVilnius University [Vilnius] (3 Universiteto St, LT-01513 Vilnius - Lithuania)P. MoskalikCopernicus Astronomical Center, Warsaw, PolandG. PajdoszCopernicus Astronomical Center, Warsaw, PolandA. S. BaranMt Suhora Observatory, Cracow Pedagogical University, Cracow, PolandM. WiniarskiMount Suhora Observatory, Cracow Pedagogical University (Ul. Podchorazych 2, 30-084 Krakow - Poland)S. ZołaAstronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, PolandW. OgłozaMt Suhora Observatory, Cracow Pedagogical University, Cracow, PolandM. SiwakAstronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, PolandZs. BognárKonkoly Observatory, Research Center for Astronomy and Earth Sciences (Konkoly Thege u. 15-17,
H-1121 Budapest - Hungary)J.‐E. SolheimInstitute of Theoretical Astrophysics, University of Oslo, NO 0315 Oslo, NorwayRamotholo SefakoSouth African Astronomical Observatory, Observatory 7935, Cape Town, South AfricaD. A. H. BuckleySouth African Astronomical Observatory, Observatory 7935, Cape Town, South AfricaD. O’DonoghueSouth African Astronomical Observatory, Observatory 7935, Cape Town, South AfricaT. NagelInstitut fr Astronomie und Astrophysik, Universitet Tbingen, Sand 1, 72076 Tbingen, GermanyR. SilvottiINAF Osservatorio Astronomico di Torino, strada dell Osservatorio 20, 10025 Pino Torinese, ItalyI. BruniINAF Osservatorio Astronomico di Torino, strada dell Osservatorio 20, 10025 Pino Torinese, ItalyJ. R. FremyLESIA, Observatoire de Paris-Meudon, Meudon, FranceG. VauclairLaboratoire d'Astrophysique de Toulouse-Tarbes CNRS-UMR5572, Universit de Toulouse, FranceM. ChevretonJanssen (France)N. DolezLaboratoire d'Astrophysique de Toulouse-Tarbes CNRS-UMR5572, Universit de Toulouse, FranceB. PfeifferLaboratoire d'Astrophysique de Toulouse-Tarbes CNRS-UMR5572, Universit de Toulouse, FranceM. A. BarstowAstronomy Department, Leicester University, University Road, Leicester LE1 7RHO. L. CreeveyInstituto de Astrofisica de Canarias, Tenerife, SpainS. D. KawalerDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50211, USAJ. C. ClemensDepartment of Physics and Astronomy, University of North Carolina, Philips Hall, CB 3255, Chapel Hill, NC 27599, USA
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Annotatsiya
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.
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