HST Observation of GD 358

The success of asteroseismology lies in the correct identification of the star's normal modes of oscillation. Winget et al. (1994) identified the normal modes of a helium white dwarf pulsator, GD 358, through the frequency distribution of the pulsation. Robinson et al. (1995) described a new mo...

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Veröffentlicht in:Baltic astronomy 1998-06, Vol.7 (2), p.203-210
Hauptverfasser: Nitta, A., Kepler, S. O., Winget, D. E., Koester, D., Krzesinski, J., Pajdosz, G., Jiang, Xiaojun, Zola, S.
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Sprache:eng
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Zusammenfassung:The success of asteroseismology lies in the correct identification of the star's normal modes of oscillation. Winget et al. (1994) identified the normal modes of a helium white dwarf pulsator, GD 358, through the frequency distribution of the pulsation. Robinson et al. (1995) described a new mode identification method by comparing the pulsation amplitudes in the UV and optical ranges. In order to cross-calibrate the two mode identification methods, we decided to apply the method used by Robinson et al. to GD 358. In August 1996, the HST took time-series spectroscopic data of GD 358 using the Faint Object Spectrograph. We also obtained nearly simultaneous ground-based optical data necessary to apply the method of Robinson et al. At this stage, we can only rule out the possibility of l = 3 for the three modes we analyzed, but cannot determine to which value the modes correspond. (Author)
ISSN:2543-6376
1392-0049
2543-6376
DOI:10.1515/astro-1998-0204