Inter-Eclipse Spectroscopic Snapshot of Epsilon Aurigae with HST
release_roxm7xzp7ngepiy7a2leqdilcu
by
Yaron Sheffer,
David L. Lambert
1999
Abstract
A single-epoch low resolution GHRS spectrum of the eclipsing binary Epsilon
Aurigae was obtained while the secondary was orbiting towards eclipse by the
primary. The detected emission line profiles have the appearance of double-
peaked emission with a stronger red component at a radial velocity of +108
km/s, and a weaker blue emission bump at ca. -92 km/s. We compare these
observational results with known orbital properties of the epsilon Aur binary
system, and propose that the emission originates at the inner radius of the
disk surrounding the enigmatic secondary. We interpret the kinematic data as a
possible means to uncover the underlying stellar masses and we speculate about
the binary's relationship to other "high-mass" models.
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