Hubble Space Telescope observations of white dwarfs in detached binaries

Details Hubble Space Telescope observations of white dwarfs in detached binaries Hubble Space Telescope observations of white dwarfs in detached binaries

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.172a2029b&link_type=abstract

Journal of Physics: Conference Series, Volume 172, Issue 1, pp. 012029 (2009).

Physics

6

Scientific paper

I describe three programs of Hubble Space Telescope (HST) observations of white dwarfs (WDs) in detached binaries. (1) I summarize the HST UV spectroscopy of the Hyades eclipsing binary V471 Tauri, containing a dK main-sequence star and a hot WD. By phasing time-resolved STIS spectra on the 9.25-min rotation period of the WD, we have shown that there are two opposite spots on the WD where there is magnetic accretion from the K star's wind. (2) Several programs of direct imaging and FGS astrometry are yielding high-precision visual orbits and dynamical masses, including the famous systems of Sirius and Procyon, as well as three fainter binaries in which both components are DC WDs. (3) Finally I discuss the bizarre nucleus of the low-surface-brightness planetary nebula EGB 6. The central star is associated with a compact emission-line nebula, which HST imaging shows is associated with a resolved dM companion. Why there should be a compact nebula around the cool star is puzzling; we speculate that it could be an accretion disk of material captured from the outflow that produced the surrounding faint PN. In a recent development, Spitzer has detected a 24 μm excess from EGB 6, indicating a dust component at a temperature of ~260 K; the location of this dust relative to the hot and cool stars and the compact nebula remains uncertain at present.

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