FOS observations of G117-B15A and the blue edge of the ZZ Ceti instability strip

Details FOS observations of G117-B15A and the blue edge of the ZZ Ceti instability strip FOS observations of G117-B15A and the blue edge of the ZZ Ceti instability strip

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291l...9k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. L9-L12

Astronomy and Astrophysics

Astrophysics

56

Stellar Convection, Stellar Oscillations, Stellar Temperature, Ultraviolet Spectra, White Dwarf Stars, Hubble Space Telescope, Optical Thickness, Spectrographs, Ultraviolet Spectroscopy

Scientific paper

From an analysis of Faint-Object-Spectrograph (FOS) observations of G117-B15A, one of the hottest members of the ZZ Ceti class, we derive an effective temperature of 12,250 +/- 125 K. Since several other DA near the blue edge of the instability strip must have very similar temperatures according to their UV spectra, it is likely that the blue edge is lower than assumed until now. The spectrum can only be fitted, if we assume a relatively high convective efficiency, corresponding to a mixing-length parameter of about 2.

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