Issue |
A&A
Volume 381, Number 1, JanuaryI 2002
|
|
---|---|---|
Page(s) | 122 - 150 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011483 | |
Published online | 15 January 2002 |
Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star*
1
Université Paul Sabatier, Observatoire Midi-Pyrénées, CNRS/UMR5572, 14 Av. É. Belin, 31400 Toulouse, France
2
Copernicus Astronomical Center, Ul. Bartycka 18, 00-716 Warsaw, Poland
3
Observatoire de Paris-Meudon, DAEC, 92195 Meudon, France
4
Department of Astronomy and McDonald Observatory, Texas University at Austin, Austin, TX 78712, USA
5
Sloan Digital Sky Survey, Apache Pt. Observatory, PO Box 59, Sunspot, NM 88349, USA
6
Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
7
Department of Physics, University of Tromso, 9037 Tromso, Norway
8
Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain
9
Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
10
Instituto de Física-UFRGS, Av. B. Goncalves 9500, 91501-900 Porto-Alegre, RS, Brazil
11
Departamento de Física, Universidade Federal de Santa Catarina, CP 476, CEP 88040-900, Florianópolis, Brazil
12
Department of Physics, University of North Carolina, Chapel Hill, NC 27599-3255, USA
13
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
14
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
15
Joint Institute for Laboratory Astrophysics, University of Colorado, Box 440, Boulder, CO 80309, USA
16
Department of Physics and Astronomy, University of Arkansas at Little Rock, Little Rock, AR 72204, USA
17
Los Alamos National Laboratory, X-2, MS B-220, Los Alamos, NM 87545, USA
18
Guest Observer, Institute for Astronomy, Honolulu, HI, USA
19
Department of Physics and Space Sciences and SARA Observatory, Florida Institute of Technology, Melbourne, FL 32901, USA
20
Siding Spring Observatory, and Department of Mathematics, Australian National University, Canberra, Australia
21
Beijing Astronomical Observatory, Chinese Academy of Sciences, 20A, Datun Road, Beijing 100012, PR China
22
Indian Space Research Organization, Airport Road, Vimanapura PO, Bangalore 560017, India
23
Institute of Theoretical Physics and Astronomy, Gostauto 12, Vilnius 2600, Lithuania
24
Astronomical Institute, Astronomicheskaya 33, Tashkent 700052, Uzbekistan
25
Wise Observatory, Tel Aviv University, Tel Aviv 69978, Israel
26
Mt. Suhora Observatory, Cracow Pedagogical University, Ul. Podchorazych 2, 30-084 Cracow, Poland
27
Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland
Corresponding author: G. Vauclair, gerardv@obs-mip.fr
Received:
17
July
2001
Accepted:
15
October
2001
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.
Key words: stars: fundamental parameters / stars: individual (RXJ 2117+3412) / stars: oscillations
Based on data obtained in observing time allocated by the Bernard Lyot Telescope, INSU/CNRS, France, the TCS at Teide Observatory, Tenerife, Spain, the INT and JKT Telescopes at Roque de Los Muchachos Observatory, La Palma, Spain, the Laboratorio Nacional de Astrofisica/CNPq, Brazil, the McDonal Observatory, Texas, USA, the Steward Observatory, Arizona, USA, the Mauna Kea Observatory, University of Hawaii, USA, the Mount Stromlo and Siding Spring Observatory, Australia, the Beijing Observatory, China, the Vainu Bappu Observatory, India, the Maidanak Observatory, Uzbekistan, the Wise Observatory, Israel, and the Suhora Observatory, Poland.
© ESO, 2002
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