Table 2.
Summary of the population of massive, evolved stars within the GC broken down by location and spectral type.
| Isolated | Arches | Quint. | Gal Cen. | ||
|---|---|---|---|---|---|
| Sub-type | Total | ||||
| O4-6 Ia | 5 | 35 | 0 | 0 | 40 |
| O7-8 Ia | 0 | 0 | 19 | 0 | 19 |
| O9-B0 Ia | 3 | 0 | 9 | 0 | 12 |
| OB Ia | 1 | 0 | 10 | 26 | 37 |
| O4-5 Ia+ | 3 | 3 | 0 | 0 | 6 |
| O5-6 Ia+ | 0 | 2 | 0 | 1 | 3 |
| O6-7 Ia+ | 2 | 2 | 2 | 0 | 6 |
| O7-8 Ia+ | 3 | 1 | 0 | 0 | 4 |
| WN7-9ha | 12 | 13 | 2 | 0 | 27 |
| WN9-11h/ | 9 | 0 | 10 | 8 | 27 |
| early-B HG | |||||
| sgB[e]/LBV/ | 8 | 0 | 3 | 0 | 11 |
| late-B HG | |||||
| WN5-7 | 8 | 0 | 1 | 4 | 13 |
| WN8 | 0 | 0 | 0 | 5 | 5 |
| WN/WC | 0 | 0 | 0 | 2 | 2 |
| WC5-6 | 0 | 0 | 0 | 1 | 1 |
| WC8-9 | 16 | 0 | 14 | 13 | 43 |
Notes. Numbers derive from this work, Clark et al. (2018a,b, 2019b) and Paumard et al. (2006). We expect the census for the Arches to be largely complete for WNLha stars and O hypergiants (Sect. 4.3); however following from Bartko et al. (2010) the numbers for the GC cluster are lower limits, while it is almost certain that the same is true for both the Quintuplet cluster members and isolated stars (Sect. 4.3). Given the uncertainty in spectral types for supergiants within the GC cluster we assign them a generic OB Ia classification; see text for details. For brevity we assign the isolated B0-3 Ia star 2MASS J17444501-2919307 to this cohort and the hybrid star P75 to the WN7-9ha total. See footnotes 5 and 11 regarding the totals derived for the Quintuplet; the generic OB Ia stars listed for this cluster are the faint cohort identified by Clark et al. (2018b; mF205W > 13). Finally the 35 O4-6Ia stars within the Arches include five objects with luminosity class I–III for completeness.
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