Binary Star Orbits. V. The Nearby White Dwarf - Red Dwarf pair 40 Eri BC
Brian D. Mason, William I. Hartkopf, Korie N. Miles
TL;DR
This paper presents a new orbit solution and dynamical masses for the nearby white dwarf - red dwarf pair 40 Eri BC, refining previous measurements and resolving earlier inconsistencies.
Contribution
It provides the first precise dynamical masses for 40 Eri BC and updates its orbital parameters, improving understanding of this nearby binary system.
Findings
Orbital period of 230.09 years with high precision.
White dwarf mass of 0.575 solar masses.
Red dwarf mass of 0.2041 solar masses.
Abstract
A new relative orbit solution with new dynamical masses is determined for the nearby white dwarf - red dwarf pair 40 Eri BC. The period is 230.09+/-0.68y. It is predicted to close slowly over the next half-century getting as close as 1.32" in early 2066. We determine masses of 0.575+/-0.018 for the white dwarf and 0.2041+/-0.0064 for the red dwarf companion. The inconsistency of the masses determined by gravitational redshift and dynamical techniques, due to a premature orbit calculation, no longer exists.
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