Table 7
L′ excess fractions in the Arches cluster.
| Field | Main seq J − Ks | n ms | n ms,corr | n ex | n ex,corr | f ex | σ fex,low | σ fex,high | f ex,corr | Comment |
|
|
||||||||||
| 1 | 4.0–6.2 | 231 +2/–7 | 546 | 10 (+2) | 66 (+6) | 4.3 (5.2) | –0.1 | +0.2 | 12.1 (13.2) | |
| 2 | 5.0–6.2 | 21 +5/–4 | 46 | 0 | – | 0.0 | – | – | – | no excess members |
| 3 | 3.7–5.5 | 83 +2/–6 | 199 | 5 | 10 | 6.0 | –0.1 | +0.5 | 5.0 | 1 excess also in F5 |
| 4 | 4.7–6.0 | 38 +1/–4 | 89 | 1 | 1.5 | 2.6 | –0.1 | +0.3 | 1.7: | just one excess |
| 5 | 4.0–5.3 | 62 +2/–7 | 126 | 6 | 14 | 9.7 | –0.3 | +1.2 | 11.1 | 2 excess also in F1 |
|
|
||||||||||
| 1,3,4,5a | – | 400 +7/–24 | 906 | 19 (+2) | 85 (+6) | 4.8 (5.3) | –0.1 | +0.3 | 9.4 (10.0) | main seq: F1/3/4/5 |
| Alla | – | 421 +12/–28 | 952 | 19 (+2) | 85 (+6) | 4.5 (5.0) | –0.1 | +0.3 | 8.9 (9.6) | main seq: F1/2/3/4/5 |
Notes. Column 2 contains the main-sequence colour selection for each field; Cols. 3, 4 and 5, 6 are the observed and completeness corrected number of main-sequence stars and excess sources, respectively; Col. 7 provides the observed excess fraction in per cent, while Col. 10 contains the completeness corrected excess fractions in per cent; Cols. 8 and 9 are the uncertainties in the derived excess fraction when shifting the red main-sequence boundary by ± 0.2 mag: adding these values to the excess fraction in Col. 5 yields the lower and upper limits of the excess fractions in each field and across the cluster area.
The total number counts used to calculate the combined excess fraction of the cluster in the final two rows are reduced by the number of 14 duplicate main sequence and 3 duplicate excess sources in the overlap regions between Fields 1, 3, and 5, and incompleteness number counts are adjusted accordingly.
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