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 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
4 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
5 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
6 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
7 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
8 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
9 Cl* NGC 6809 MFRBS 47 WD* 19 38 37.5932307264 -31 04 39.978694848   17.135 17.006     DA 11 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 BS* 19 39 47.0363097144 -30 52 53.368854096 17.231 17.031 16.728 16.566 16.365 ~ 5 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 SAW V63 SX* 19 39 49.2879695833 -30 56 31.806120908 16.888 16.728 16.404 16.204 15.960 ~ 7 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 SAW V69 SX* 19 39 53.7643363342 -31 00 47.431505543 17.448 17.388 17.045 16.830 16.582 ~ 6 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 54.9503200669 -30 58 22.195973253 17.414 17.341 17.001 16.794 16.560 ~ 10 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 BS* 19 39 56.4047098774 -30 58 19.045984462 16.044 15.993 15.884 15.948 15.685 ~ 3 0
24 Cl* NGC 6809 MFRBS 15 BS* 19 39 56.6311053278 -30 57 36.177870859 17.256 17.011 16.778 16.599 16.515 ~ 4 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 BS* 19 39 58.2810909855 -30 55 07.343766806 18.158 18.285 17.775 17.158 17.024 ~ 4 0
29 Cl* NGC 6809 MFRBS 34 BS* 19 39 58.5966172277 -30 54 23.020609312 16.816 16.628 16.334 16.163 15.949 ~ 4 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 SAW V57 SX* 19 39 59.5820148079 -30 56 53.999448645 17.069 16.898 16.626 16.476 16.296 ~ 7 0
33 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 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 SAW V48 SX* 19 40 02.9360074389 -30 57 29.429725927 16.552 16.358 16.071 15.888 15.718 ~ 6 0
41 Cl* NGC 6809 MFRBS 10 SX* 19 40 02.9504061822 -30 58 29.287878475 17.058 16.854 16.536 16.327 16.111 ~ 11 0
42 Cl* NGC 6809 SAW V59 SX* 19 40 04.0209789789 -30 58 13.712981675 17.112 16.902 16.596 16.381 16.112 ~ 5 0
43 Cl* NGC 6809 MFRBS 41 BS* 19 40 04.2029975330 -30 54 53.912198412 17.278 17.228 16.854 16.609 16.364 ~ 4 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 BS* 19 40 05.1537033293 -30 58 49.791794783 17.753 17.693 17.322 17.085 16.800 ~ 4 0
46 Cl* NGC 6809 SAW V53 BS* 19 40 05.2277563920 -30 59 22.291169928 17.028 16.851 16.587 16.435 16.249 ~ 5 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 SX* 19 40 06.4584321888 -30 59 28.043746728 16.423 16.246 15.957 15.783 15.567 ~ 5 0
49 Cl* NGC 6809 MFRBS 22 SX* 19 40 06.8713104239 -30 56 33.033552217 17.356 17.310 16.970 16.768 16.533 ~ 10 0
50 Cl* NGC 6809 SAW V55 SX* 19 40 07.9281617856 -30 56 50.521030751 17.745 17.634 17.267 17.033 16.706 ~ 6 0
51 Cl* NGC 6809 SAW V45 SX* 19 40 08.8224194939 -30 57 16.469743156 16.760 16.587 16.328 16.178 15.988 ~ 7 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 BS* 19 40 16.5216644856 -30 59 04.703631000 16.992 16.795 16.506 16.340 16.154 ~ 4 0
55 Cl* NGC 6809 MFRBS 33 BS* 19 40 23.2131133886 -30 56 50.373304252 16.650 16.595 16.183 15.913 15.629 ~ 3 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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