Table 5
L′ excess fractions in the Quintuplet 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 exc,corr | Comment |
|
|
||||||||||
| 1 | 4.0–5.5 | 599 +40/–57 | 684 | 18 (+1) | 20.5 (22) | 3.0 (3.2) | –0.2 | +0.3 | 3.0 (3.2) | J< 22.8 mag |
| 4.0–5.5 | 445 +32/–39 | 484 | 15 (+1) | 21.2 (+2) | 3.4 (3.6) | –0.3 | +0.3 | 4.4 (4.8) | J< 22 mag | |
| 2 | 4.0–5.0 | 80 +4/–16 | 96 | 3 | 4.2 | 3.8 | –0.2 | +0.2 | 4.4 | J< 22 main seq F2-F5 |
| 3 | 3.7–4.5 | 45 +9/–8 | 47 | 0 | – | 0.0 | – | – | no excess members | |
| 4 | 3.7–5.0 | 54 +9/–12 | 69 | 1 | 1.1 | 1.8 | –0.2 | +0.6 | 1.6: | low-sensitivity L′ |
| 5 | 3.7–4.7 | 99 +13/–9 | 115 | 4 (+1) | 5 (6) | 4.0 (5.0) | –0.4 | +0.4 | 4.2 (5.2) | excess at J = 22.1 included |
|
|
||||||||||
| 1,2,5a | – | 591 +49/-64 | 658 | 24 (+1) | 27 (+1) | 4.1 (4.2) | -0.3 | +0.5 | 4.1 (4.3) | main seq: F1/2/5 J< 22 |
| Alla | – | 681 +67/-84 | 766 | 25 (+1) | 28 (+1) | 3.7 (3.8) | -0.4 | +0.5 | 3.7 (3.8) | main seq: F1/2/3/4/5 J< 22 |
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 observed 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 2 duplicate excess sources in the overlap regions between Fields 2 and 5 with Field 1, and main-sequence number counts are reduced by 33 duplicates in F2 and F5 (plus 6 duplicates in F4), and incompleteness number counts are adjusted accordingly.
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