Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star
G. VauclairUniversité Paul Sabatier, Observatoire Midi-Pyrénées, CNRS/UMR5572, 14 Av. É. Belin, 31400 Toulouse, FranceP. MoskalikCopernicus Astronomical Center, Ul. Bartycka 18, 00-716 Warsaw, PolandB. PfeifferUniversité Paul Sabatier, Observatoire Midi-Pyrénées, CNRS/UMR5572, 14 Av. É. Belin, 31400 Toulouse, FranceM. ChevretonObservatoire de Paris-Meudon, DAEC, 92195 Meudon, FranceN. DolezUniversité Paul Sabatier, Observatoire Midi-Pyrénées, CNRS/UMR5572, 14 Av. É. Belin, 31400 Toulouse, FranceB. SerreUniversité Paul Sabatier, Observatoire Midi-Pyrénées, CNRS/UMR5572, 14 Av. É. Belin, 31400 Toulouse, FranceS. J. KleinmanDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAM. A. BarstowDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UKA. E. SansomDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UKJ.‐E. SolheimDepartment of Physics, University of Tromso, 9037 Tromso, NorwayJuan Antonio BelmonteInstituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, SpainS. D. KawalerDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011, USAS. O. KeplerInstituto de Física-UFRGS, Av. B. Goncalves 9500, 91501-900 Porto-Alegre, RS, BrazilA. KanaanDepartamento de Física, Universidade Federal de Santa Catarina, CP 476, CEP 88040-900, Florianópolis, BrazilO. GiovanniniInstituto de Física-UFRGS, Av. B. Goncalves 9500, 91501-900 Porto-Alegre, RS, BrazilD. E. WingetDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAT. K. WatsonDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAR. E. NatherDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAJ. C. ClemensDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAJ. ProvencalDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAJ. S. DixsonDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAK. YanagidaDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAA. Nitta KleinmanDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAΜ. H. MontgomeryDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAE. W. KlumpeDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAA. BruvoldDepartment of Physics, University of Tromso, 9037 Tromso, NorwayM. S. O’BrienDepartment of Physics and Astronomy, Iowa State University, Ames, IA 50011, USACarl J. HansenJoint Institute for Laboratory Astrophysics, University of Colorado, Box 440, Boulder, CO 80309, USAA. D. GrauerDepartment of Physics and Astronomy, University of Arkansas at Little Rock, Little Rock, AR 72204, USAPaul A. BradleyDepartment of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USAM. A. WoodDepartment of Physics and Space Sciences and SARA Observatory, Florida Institute of Technology, Melbourne, FL 32901, USAN. AchilleosSiding Spring Observatory, and Department of Mathematics, Australian National University, Canberra, AustraliaShengyi JiangBeijing Astronomical Observatory, Chinese Academy of Sciences, 20A, Datun Road, Beijing 100012, PR ChinaJian-Ning FuBeijing Astronomical Observatory, Chinese Academy of Sciences, 20A, Datun Road, Beijing 100012, PR ChinaΤ. Μ. K. MararIndian Space Research Organization, Airport Road, Vimanapura PO, Bangalore 560017, IndiaΒ. N. AshokaIndian Space Research Organization, Airport Road, Vimanapura PO, Bangalore 560017, IndiaE. MeištasInstitute of Theoretical Physics and Astronomy, Gostauto 12, Vilnius 2600, LithuaniaА. В. ЧернышевAstronomical Institute, Astronomicheskaya 33, Tashkent 700052, UzbekistanT. MazehWise Observatory, Tel Aviv University, Tel Aviv 69978, IsraelE. LeibowitzWise Observatory, Tel Aviv University, Tel Aviv 69978, IsraelShirley HemarWise Observatory, Tel Aviv University, Tel Aviv 69978, IsraelJ. KrzesińskiMt. Suhora Observatory, Cracow Pedagogical University, Ul. Podchorazych 2, 30-084 Cracow, PolandG. PajdoszMt. Suhora Observatory, Cracow Pedagogical University, Ul. Podchorazych 2, 30-084 Cracow, PolandS. ZołaAstronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland
ABI
Аннотация
The pulsating PG 1159 planetary nebula central star RXJ 2117+3412 has been observed over three successive seasons of a multisite photometric campaign. The asteroseismological analysis of the data, based on the 37 identified modes among the 48 independent pulsation frequencies detected in the power spectrum, leads to the derivation of the rotational splitting, the period spacing and the mode trapping cycle and amplitude, from which a number of fundamental parameters can be deduced. The average rotation period is days. The trend for the rotational splitting to decrease with increasing periods is incompatible with a solid body rotation. The total mass is 0.56 and the He-rich envelope mass fraction is in the range 0.013–0.078 . The luminosity derived from asteroseismology is log( and the distance 760 pc. At such a distance, the linear size of the planetary nebulae is pc. The role of mass loss on the excitation mechanism and its consequence on the amplitude variations is discussed.
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