Two Post-Common-Envelope Binaries in the Hyades Cluster

Details Two Post-Common-Envelope Binaries in the Hyades Cluster Two Post-Common-Envelope Binaries in the Hyades Cluster

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8305b&link_type=abstract

HST Proposal ID #8305

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Hst Proposal Id #8305 Binary Stars

Scientific paper

V471 Tau and HZ 9 are two detached binaries that are members of the Hyades cluster and consist of hot white dwarfs with main-sequence K-M companions. They have emerged from common- envelope interactions which drastically reduced their initially wide separations. For V471 Tau we will use STIS to confirm and further explore the host of fascinating phenomena that we have found using GHRS in a very limited spectral range near Lyman-Alpha. We have shown that the white-dwarf component, which rotates with a 9.25-min period, has a polar cap of accreted metals. The implied accretion rate from the dK wind, however, is so low that a magnetic propeller mechanism must be rejecting most of the material that attempts to accrete. In fact, we tentatively find Zeeman splitting of a metallic line, implying a field strength of ~350 kG, sufficient for the propeller mechanism to work. The GHRS radial velocities imply a white dwarf mass of 0.85 M_odot, paradoxically much too massive for the star's high temperature. STIS, whose echelle can cover the entire UV spectrum from 1150-1710 Angstrom, is ideal for confirming and extending all of these exciting findings. We will also use STIS to obtain the first high-resolution UV spectra of HZ 9, to see to what extent the above phenomena occur in a non- magnetic system which is otherwise remarkably similar to V471 Tau, and to determine accurate component masses.

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