Table 3.
Formation rates and expected number counts for wide composite sdB binaries based on our MESA runs.
| Type | Thin | Thick | Bulge | Halo | Total |
|---|---|---|---|---|---|
| RMW, kyr−1 | 0.91 | 0.14 | 0.13 | 0.025 | 1.2 |
| NMW, tot/105 | 1.6 | 0.31 | 0.21 | 0.041 | 2.1 |
| nloc, kpc−3 | 141 | 3.7 | 0 | 0.0072 | 150 |
| N500pc | 43 | 1.6 | 0 | 0.0034 | 45 |
| N1kpc | 230 | 11 | 0 | 0.030 | 240 |
Notes. The columns represent the Galactic components: thin disc, thick disc, the Galactic bulge, the halo and the totals. The rows show the present-day formation rate (RMW) and the expected number counts (NMW, tot) for each Galactic component, as well as the local number density (nloc) and the number of systems within 500 pc (N500 pc) and within 1000 pc (N1 kpc) from each Galactic component. All the numbers in the table are given to two significant digits and correspond to sdB binaries which are both identifiable observationally as wide composite sdB binaries and are included in the Gaia cuts shown in Fig. 15. The values in this table may be rescaled to a different stellar mass of the Galaxy M⋆, new or a different average star formation rate R⋆, new over the Galactic age of TMW by multiplying them by a factor M⋆, new/(6.43 ⋅ 1010 M⊙) or (R⋆, new/(4.59 M⊙ yr−1)) ⋅ (TMW/(14 Gyr)), correspondingly.
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