  Further studies of the binary V658 Car (HD 92406) have now confirmed its
unique main features, i.e. a shell star primary component being eclipsed by a
hot low-mass star. Obviously, this binary is in its post-Algol evolutionary
stage, and containing a rapidly rotating primary star and a contracting hot
companion star. The analysis of old radial-velocity data indicating a primary
star of lower mass has now resulted in amended parameters for the binary.
According to stellar models the primary star should have a mass of 2.16 +/-
0.14 Msun and a radius of 1.64 +/- 0.04 Rsun for a Teff of 9700 +/- 500 K based
on known spectral type A0p. For the secondary star 1.46 +/- 0.04 Rsun and 12750
+/- 700 K Teff have been derived and are fitting well to an existing
evolutionary track for a contracting white dwarf precursor of 0.28 Msun. Our
photometric results have confirmed the concave shape of the large decretion
disk surrounding the primary star, as predicted by existing models.
