FUSE Observations of the Symbiotic Binary EG And

Details FUSE Observations of the Symbiotic Binary EG And FUSE Observations of the Symbiotic Binary EG And

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712907e&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #129.07; Bulletin of the American Astronomical Society, Vol. 33, p.713

Astronomy and Astrophysics

Astronomy

Scientific paper

The eclipsing symbiotic binary EG And consists of a white dwarf with TWD ≈ 70,000 K orbiting an (apparently normal) red giant of spectral type M2.5 III. We have observed EG And on multiple occasions with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite with the goal of studying phase-dependent absorption first detected with IUE. Although far-UV data for EG And were obtained with the Hopkins Ultraviolet Telescope (HUT), our FUSE spectra are of significantly higher resolution and provide new insights into the conditions in ths system. Our first FUSE observation was made as the white dwarf was about to pass behind the red giant primary (\bar φ = 0.82), and our second observation was obtained post-eclipse and close to quadrature (\bar φ = 0.26). (A further observation is planned for \bar φ = 0.50 in December 2000.) Comparison of our first two observations reveals clear differences in both the strength and/or velocity of the absorbing material seen along the line-of-sight to the white dwarf. In particular, our FUSE spectra reveal the presence of a significant amount of hot gas (CIII*, SiIV, SIV, PV, SVI, OVI), that is significantly redshifted relative to the red giant primary, and which only partially obscures the surface of the white dwarf. We discuss our observations in terms of the diagnostics obtainable from our far-UV data, ranging from the temperature of molecular hydrogen and the column densities of ISM material, through to the density, temperature, amount, and location of both photoionized and shocked gas within the binary. SMcC acknowledges funding from NASA through a FUSE Guest Investigator grant.

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