Fig. 10
The positions of IP Eri and its twin system HR 1608 (black circled crosses; Beavers & Eitter 1988, quoted by Landsman et al. 1993) in the eccentricity – period diagram are compared with those of the long-period sdB binaries, with (mostly) pre-mass-transfer binaries (normal K and M giants), and with post-mass-transfer binaries (Barium and S stars). Symbols are as indicated in the figure label.
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