HST Observation of GD 358

Details HST Observation of GD 358 HST Observation of GD 358

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998balta...7..203n&link_type=abstract

Baltic Astronomy, v.7, p.203-209.

Astronomy and Astrophysics

Astronomy

5

Stars: White Dwarfs, Oscillations, Individual: Gd 358

Scientific paper

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 ultraviolet 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 Hubble Space Telescope 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 l value the modes correspond.

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