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Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..516f&link_type=abstract
17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 516-519 (2010).
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White Dwarfs, Convection, Astronomical Observatories, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Natural Convection, Observatories And Site Testing
Scientific paper
The ZZ Ceti HS 0507+0434B is of special interest because it lies in a common proper motion system with HS 0507+0434A, another DA white dwarf of Teff = 20000 K. It lies in the middle of the instability strip and is a potentially useful pulsator to study the convection-pulsation interaction. Its pulsation spectrum has shown 10 independent frequencies and a number of linear combinations. In an effort to better constrain its internal structure, we have performed new observations of HS 0507+0434B. We describe these new data obtained from mono-site as well as multi-site campaigns between 2007 and 2010. The analysis of these data reveals a complex behavior of the pulsator, with both frequency and amplitude variations on this 1.5 year time scale. We identify 7 l = 1 multiplets. We computed a grid of models and their l = 1 g-modes. We then applied a χ2 fit method to derive a preliminary best fit model with: M*/Msolar = 0.70, L/Lsolar = 3.5×10-3, Teff = 12080 K, MH/M* = 10-4.4.
Alvarez Marcelo
Chevreton M.
Dolez Noel
Fox Machado L.
Fu Jian-Ning
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