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Table 3
Collection of literature binary fraction estimates.
| ID | fbin | note | region | reference |
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| E 3 | 0.29 ± 0.09 | lower limit | within 2 core radius | Veronesi et al. (1996) |
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| ARP 2 | >0.08 | lower limit | within core | Sollima et al. (2007) |
| 0.329-0.521 | all | within core | Sollima et al. (2007) | |
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| NGC 104 (47 Tucanae) | 0.14 ± 0.04 | all | within half-mass radius | Albrow et al. (2001) |
| >0.05 | lower limit | outside half-mass radius | De Marchi & Paresce (1995) | |
| ~0.02 | all | outside half-mass radius | Anderson (1997) | |
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| NGC 288 | >0.10 | lower limit | 1-6 core radius | Bolte (1992) |
| 0.10-0.20 | all | within half-mass radius | Bellazzini et al. (2002) | |
0.01 |
all | outside half-mass radiu | Bellazzini et al. (2002) | |
| >0.06 | lower limit | within core | Sollima et al. (2007) | |
| 0.116-0.145 | all | within core | Sollima et al. (2007) | |
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| NGC 362 | 0.21 ± 0.06 | all | within half-mass radius | Fischer et al. (1993) |
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| NGC 2808 | 0.20 ± 0.04 | outside half-mass radius | Alcaino et al. (1998) | |
| 0.04 ± 0.01 | all | outside half-mass radius | Milone et al. (Milone2010) | |
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| NGC 3201 | <0.10 | upper limit | outside half-mass radius | Cote et al. (2007) |
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| NGC 4590 | >0.09 | lower limit | within core | Sollima et al. (2007) |
| 0.142-0.186 | all | within core | Sollima et al. (2007) | |
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| NGC 5053 | >0.08 | lower limit | within core | Sollima et al. (2007) |
| 0.110-0.125 | all | within core | Sollima et al. (2007) | |
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| NGC 5139 (ω Centauri) | <0.05 | upper limit | outside half-mass radius | Elson et al. (1995) |
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| NGC 5272 (M3) | “low” | all | outside half-mass radius | Gunn & Griffin (1979) |
| ~0.04 | all | outside half-mass radius | Pryor et al. (1988) | |
| 0.14 ± 0.08 | all | inside half-mass radius | Zhao & Bailyn (2005) | |
0.02 |
all | outside half-mass radius | Zhao & Bailyn (2005) | |
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| NGC 5466 | >0.08 | lower limit | within core | Sollima et al. (2007) |
| 0.095-0.117 | all | within core | Sollima et al. (2007) | |
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| NGC 5897 | >0.07 | lower limit | within core | Sollima et al. (2007) |
| 0.132-0.171 | all | within core | Sollima et al. (2007) | |
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| NGC 6101 | >0.09 | lower limit | within core | Sollima et al. (2007) |
| 0.156-0.210 | all | within core | Sollima et al. (2007) | |
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| NGC 6121 (M4) |
|
all | inside half-mass radius | Cote & Fischer (1996) |
| ~0.02 | all | outside half-mass radius | Richer et al. (2004) | |
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| NGC 6341 (M92) |
|
lower limit | outside half-mass radius | Anderson (1997) |
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| NGC 6362 | >0.06 | lower limit | within core | Sollima et al. (2007) |
| 0.118-0.127 | all | within core | Sollima et al. (2007) | |
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| NGC 6397 | <0.07 | upper limit | within half-mass radius | Cool & Bolton (2002) |
| 0.051 ± 0.010 | all | within half-mass radius | Davis et al. (2008) | |
| 0.012 ± 0.004 | all | 1.3-2.8 half-mass radii | Davis et al. (2008) | |
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| NGC 6656 (M22) |
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all | outside half-mass radius | Cote et al. (1996) |
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| NGC 6723 | >0.06 | lower limit | within core | Sollima et al. (2007) |
| 0.161-0.218 | all | within core | Sollima et al. (2007) | |
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| NGC 6752 | 0.27 ± 0.12 | all | within core | Rubenstein & Bailyn (1997) |
| 0.03 ± 0.01 | lower limit, q > 0.5 | within core | Milone et al. (2010) | |
| 0.02 |
all | between core and half-mass radius | Rubenstein & Bailyn (1997) | |
| 0.01 ± 0.01 | lower limit, q > 0.5 | between core and half-mass radius | Milone et al. (2010) | |
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| NGC 6792 | “low” | all | outside half-mass radius | Catelan et al. (2008) |
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| NGC 6809 (M55) | >0.06 | lower limit | within core | Sollima et al. (2007) |
| 0.096-0.108 | all | within core | Sollima et al. (2007) | |
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| NGC 6838 (M71) | 0.22 |
all | within half-mass radius | Yan & Mateo (1994) |
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| NGC 6981 | >0.10 | lower limit | within core | Sollima et al. (2007) |
| 0.281-0.399 | all | within core | Sollima et al. (2007) | |
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| NGC 7078 (M15) | ~0.07 | all | within half-mass radius | Gebhardt et al. (1994) |
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| NGC 7099 (M30) | <0.05 | upper limit | outside half-mass radius | Alcaino et al. (1998) |
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| PALOMAR 12 | >0.18 | lower limit | within core | Sollima et al. (2007) |
| 0.408-0.506 | all | within core | Sollima et al. (2007) | |
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| PALOMAR 13 | >0.30 ± 0.04 | lower limit | inside ~18 core radii | Clark et al. (2004) |
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| TERZAN 7 | >0.21 | lower limit | within core | Sollima et al. (2007) |
| 0.509-0.649 | all | within core | Sollima et al. (2007) | |
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