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Your search keyword '"J. R. Fremy"' showing total 2 results
Start Over Author "J. R. Fremy" Publisher springer netherlands
2 results on '"J. R. Fremy"'

1. Observation of a Variable, ZZ Ceti White Dwarf: GD154

Author

B. Pfeiffer, G. Vauclair, N. Dolez, M. Chevreton, J. R. Fremy, G. Herpe, M. Barstow, S. J. Kleinman, T. K. Watson, J. A. Belmonte, S. O. Kepler, A. Kan-Aan, O. Giovannini, R. E. Nather, D. E. Winget, J. Provencal, J. C. Clemens, P. Bradley, J. Dixson, A. D. Grauer, G. Fontaine, P. Bergeron, F. Wesemael, C. F. Claver, T. Matzeh, E. Leibowitz, and P. Moskalik

Published
1993
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2. Whole Earth Telescope Observations of the DBV White Dwarf PG1115+158: Preliminary Results

Author

D. Sullivan, T. M. K. Marar, Elia M. Leibowitz, B. N. Ashoka, Don Winget, Lilia Ferrario, A. Chen, S. Seetha, S. J. Kleinman, D. A. H. Buckley, J. S. Dixon, H. Mendelson, J. C. Clemens, Matt A. Wood, Antonio Kanaan, J. R. Fremy, Dayal Wickramasinghe, Souza Oliveira Kepler, Paul A. Bradley, G. Vauclair, R. E. Nather, D. O'Donoghue, Judith L. Provencal, M. Chevreton, Staszek Zola, Martin A. Barstow, J. Krzesinski, G. Odilon, Pawel Moskalik, and Chuck Claver

Subjects
Physics, Period (periodic table), White dwarf, chemistry.chemical_element, Astronomy, Astrophysics, Rotation, law.invention, Telescope, symbols.namesake, Fourier transform, chemistry, law, symbols, Astrophysics::Earth and Planetary Astrophysics, Multiplet, Helium, Earth (classical element)
Abstract

We present preliminary results from Whole Earth Telescope (WET) data on the DBV star PG1115+158. In the Fourier Transform of this data, we have tentatively identified peaks arranged in multiplets with common frequency splitting. The average period spacing between these multiplets is ~ 40s, very similar to the multiplet spacing found in the DBV GD358. Theoretical models show l = 1 modes with ~ 40s period spacing between modes of consecutive k for white dwarfs with niasses near 0.6M ⊙. If we assume the identified multiplets are l = 1 modes, then the rotation rate of the star is 0.45 days. Furthermore, the deviations of the period spacing between modes from the mean period spacing indicates that, like GD358, the surface Helium layer is thin, less than 10-4 M *.

Published
1993
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