Table 1.
Updated binary frequency among barium and S star samples from Jorissen et al. (1998).
| Class | N | SB19 | SB98 | SBO |
SB | SB? | No evidence SB | New HERMES SBO | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Total | Good | Preliminary | ||||||||
| Strong barium (Ba 3,4,5) | 37 | 37 | 35 | 36 | 36 | 0 | 1(a) | 0 | 0 | 2 |
| Mild barium (Ba 1,2) | 40 | 40 | 34 | 37 | 32 | 5 | 2(b) | 1(c) | 0 | 15 |
| S (no Tc) | 34 | 34 | 25/27 | 32 | 29 | 3 | 2(d) | 0 | 0 | 14 |
Notes. The S stars with radial-velocity jitter were not included. SB19 and SB98 stand for the number of spectroscopic binaries known in 2019 (present paper) and in 1998 (before HERMES), respectively, SBO denotes spectroscopic binaries with either good or preliminary orbits, SB stands for spectroscopic binaries with no orbit available yet, and SB? stands for suspected spectroscopic binary.
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