2007ApJ...670.1065L

Query : 2007ApJ...670.1065L

2007ApJ...670.1065L - Astrophys. J., 670, 1065-1073 (2007/December-1)

The surprising external upturn of the blue straggler radial distribution in M55.

LANZONI B., DALESSANDRO E., PERINA S., FERRARO F.R., ROOD R.T. and SOLLIMA A.

Abstract (from CDS):

By combining high-resolution HST and wide-field ground-based observations in ultraviolet and optical bands, we study the blue straggler star (BSS) population of the low-density galactic globular cluster M55 (NGC 6809) over its entire radial extent. The BSS projected radial distribution is found to be bimodal, with a central peak, a broad minimum at intermediate radii, and an upturn at large radii. Similar bimodal distributions have been found in other globular clusters (M3, 47 Tucanae, NGC 6752, and M5), but the external upturn in M55 is the largest found to date. This might indicate a large fraction of primordial binaries in the outer regions of M55, which seems somehow in contrast with the relatively low (∼10%) binary fraction recently measured in the core of this cluster.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: General - Stars: Blue Stragglers - Galaxy: Globular Clusters: Individual: Messier Number: M55 - Stars: Evolution

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3911 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1041 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3423 0
4 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2477 0
5 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1976 0
6 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 715 0
7 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
8 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 427 0
9 Cl* NGC 6809 MFRBS 47 WD? 19 38 37.5932307264 -31 04 39.978694848   17.135 17.006     ~ 8 0
10 Cl* NGC 6809 MFRBS 38 * 19 38 52.0821872256 -30 58 16.648124412   17.805 17.379     ~ 2 0
11 Cl* NGC 6809 MFRBS 43 * 19 38 53.5921455912 -31 01 45.510043836   18.474 18.055     ~ 2 0
12 Cl* NGC 6809 MFRBS 42 * 19 39 07.6532832360 -31 01 59.639846340   18.345 17.884     ~ 3 0
13 Cl* NGC 6809 MFRBS 28 * 19 39 11.2163837232 -31 00 03.818871396   16.330 15.873     ~ 2 0
14 Cl* NGC 6809 MFRBS 39 * 19 39 47.0363097144 -30 52 53.368854096   18.284 17.790     ~ 4 0
15 Cl* NGC 6809 MFRBS 44 * 19 39 48.0831683400 -30 47 05.703588240   17.732 17.379     ~ 2 0
16 Cl* NGC 6809 MFRBS 35 * 19 39 49.2700 -30 56 31.754   18.614 18.165     ~ 4 0
17 Cl* NGC 6809 MFRBS 16 * 19 39 52.8672 -30 57 38.790   19.027 18.574     ~ 4 0
18 Cl* NGC 6809 MFRBS 45 * 19 39 53.7451 -31 00 47.420   17.541 17.209     ~ 3 0
19 Cl* NGC 6809 MFRBS 14 * 19 39 53.98 -30 58 27.2   16.077 15.944     ~ 3 0
20 Cl* NGC 6809 MFRBS 48 * 19 39 54.8950 -30 55 13.792   18.443 18.007     ~ 2 0
21 Cl* NGC 6809 MFRBS 23 SX* 19 39 54.95 -30 58 21.2   17.36 17.02     ~ 9 0
22 Cl* NGC 6809 MFRBS 27 * 19 39 55.0647615288 -31 01 14.927071044   18.730 18.389     ~ 3 0
23 Cl* NGC 6809 MFRBS 13 * 19 39 56.3854 -30 58 19.015   18.213 17.798     ~ 2 0
24 Cl* NGC 6809 MFRBS 15 * 19 39 56.6111 -30 57 36.145   17.099 16.902     ~ 3 0
25 Cl* NGC 6809 MFRBS S12 SX* 19 39 57.67 -30 57 01.3   17.64 17.33     ~ 9 0
26 Cl* NGC 6809 MFRBS 21 SX* 19 39 58.14 -30 58 32.7   17.27 16.95     ~ 9 0
27 Cl* NGC 6809 MFRBS 40 * 19 39 58.1480095416 -30 40 10.630688736   17.525 17.097     ~ 2 0
28 Cl* NGC 6809 MFRBS 49 * 19 39 58.2422 -30 55 07.496   17.953 17.494     ~ 3 0
29 Cl* NGC 6809 MFRBS 34 * 19 39 58.5791 -30 54 22.905   17.167 16.881     ~ 3 0
30 Cl* NGC 6809 MFRBS 20 SX* 19 39 58.88 -30 58 15.6   17.11 16.71     ~ 10 0
31 Cl* NGC 6809 MFRBS 2 * 19 39 58.96 -30 56 23.7   17.582 17.325     ~ 3 0
32 Cl* NGC 6809 MFRBS 4 * 19 39 59.5684 -30 56 53.962   18.358 17.913     ~ 4 0
33 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 852 0
34 Cl* NGC 6809 MFRBS 1 * 19 39 59.9741 -30 58 00.208   16.477 16.165     ~ 3 0
35 Cl* NGC 6809 MFRBS 8 * 19 40 00.7984 -30 59 00.363   18.537 18.133     ~ 3 0
36 Cl* NGC 6809 MFRBS 11 SX* 19 40 00.99 -30 57 56.5   17.63 17.28     ~ 10 0
37 Cl* NGC 6809 MFRBS 7 * 19 40 01.0915 -30 58 00.978   17.540 17.179     ~ 3 0
38 Cl* NGC 6809 MFRBS 18 * 19 40 02.4131 -30 56 32.074   18.586 18.203     ~ 2 0
39 Cl* NGC 6809 MFRBS 9 * 19 40 02.5038 -30 58 49.327   17.927 17.446     ~ 2 0
40 Cl* NGC 6809 MFRBS 3 * 19 40 02.9205 -30 57 29.380   18.490 18.119     ~ 3 0
41 Cl* NGC 6809 MFRBS 10 SX* 19 40 02.95 -30 58 28.3   16.83 16.54     ~ 10 0
42 Cl* NGC 6809 MFRBS 5 * 19 40 04.0059 -30 58 13.673   17.468 17.118     ~ 2 0
43 Cl* NGC 6809 MFRBS 41 * 19 40 04.1895 -30 54 53.832   18.607 18.155     ~ 3 0
44 Cl* NGC 6809 MFRBS 6 * 19 40 04.6403 -30 57 57.813   16.728 16.484     ~ 3 0
45 Cl* NGC 6809 MFRBS 19 * 19 40 05.15 -30 58 49.8   17.692 17.391     ~ 3 0
46 Cl* NGC 6809 MFRBS 37 * 19 40 05.2277563920 -30 59 22.291169928   16.965 16.703     ~ 3 0
47 Cl* NGC 6809 MFRBS 17 * 19 40 06.1011 -30 58 22.060   19.067 18.636     ~ 2 0
48 Cl* NGC 6809 MFRBS 30 * 19 40 06.4584321888 -30 59 28.043746728   17.505 17.250     ~ 2 0
49 Cl* NGC 6809 MFRBS 22 SX* 19 40 06.87 -30 56 33.7   17.32 17.00     ~ 9 0
50 Cl* NGC 6809 MFRBS 46 * 19 40 07.9175 -30 56 50.479   17.660 17.380     ~ 3 0
51 Cl* NGC 6809 MFRBS 32 * 19 40 08.8110 -30 57 16.434   18.054 17.603     ~ 3 0
52 Cl* NGC 6809 MFRBS 31 * 19 40 08.89 -30 59 05.1   17.900 17.468     ~ 3 0
53 Cl* NGC 6809 MFRBS 29 * 19 40 13.07 -30 48 25.6   18.445 18.062     ~ 2 0
54 Cl* NGC 6809 MFRBS 36 * 19 40 16.5216644856 -30 59 04.703631000   17.662 17.246     ~ 3 0
55 Cl* NGC 6809 MFRBS 33 * 19 40 23.21 -30 56 50.4   17.244 16.861     ~ 2 0
56 Cl* NGC 6809 MFRBS 65 * 19 40 43.3849900944 -30 36 06.549163344   18.427 17.996     ~ 2 0
57 Cl* NGC 6809 MFRBS 64 * 19 40 49.5086796192 -30 38 47.178649932   17.735 17.357     ~ 2 0

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