Computer Science
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008coast.157..303e&link_type=abstract
Communications in Asteroseismology, Vol.157, p. 303-304
Computer Science
Scientific paper
We present preliminary models for HD 19994, a star which is part of a binary system and also harbors an extrasolar planet. We compute evolutionary tracks with the Toulouse-Geneva evo- lution code, using four different metallicity values. Large and small separations are computed, and the echelle diagrams are given for a few models. From the currently known spectroscopic data, we found that HD 19994 could be either an overmetallic main sequence star with a mass range between 1.24 and 1.36 M&sun; or a less massive subgiant star, with a mass range of 1.18-1.28 M&sun; and a solar metallicity. We also found that, in some cases, the small separations can become negative at a given frequency, which is related to the presence of a convective and helium-rich core. This is a preliminary approach: a more precise asteroseismic study of this star, based on recent (November 2007) data from the HARPS spectrograph will be given later.
Escobar M. E.
Soriano Marcos
Theado Sylvie
Vauclair Sylvie
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