2017ApJ...841...53L

Query : 2017ApJ...841...53L

2017ApJ...841...53L - Astrophys. J., 841, 53-53 (2017/May-3)

Identification of faint Chandra X-ray sources in the core-collapsed globular cluster NGC 6752.

LUGGER P.M., COHN H.N., COOL A.M., HEINKE C.O. and ANDERSON J.

Abstract (from CDS):

We have searched for optical identifications for 39 Chandra X-ray sources that lie within the 1.'9 half-mass radius of the nearby (d=4.0 kpc), core-collapsed globular cluster, NGC 6752, using deep Hubble Space Telescope ACS/WFC imaging in B435, R625, and Hα. Photometry of these images allows us to classify candidate counterparts based primarily on color-magnitude and color-color diagram location. The color-color diagram is particularly useful for quantifying the Hα-line equivalent width. In addition to recovering 11 previously detected optical counterparts, we propose 20 new optical IDs. In total, there are 16 likely or less certain cataclysmic variables (CVs), 9 likely or less certain chromospherically active binaries, 3 galaxies, and 3 active galactic nuclei. The latter three sources, which had been identified as likely CVs by previous investigations, now appear to be extragalactic objects based on their proper motions. As we previously found for NGC 6397, the CV candidates in NGC 6752 fall into a bright group that is centrally concentrated relative to the turnoff-mass stars and a faint group that has a spatial distribution that is more similar to that of the turnoff-mass stars. This is consistent with an evolutionary scenario in which CVs are produced by dynamical interactions near the cluster center and diffuse to larger radius orbits as they age.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: individual: NGC 6752 - novae, cataclysmic variables - X-rays: binaries - X-rays: binaries

Simbad objects: 41

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Number of rows : 41
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 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
4 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
5 [PLH2002] CX26 G 19 10 39.162 -59 59 45.15   25.16   23.00   ~ 2 0
6 [G93] NGC 6752 A AGN 19 10 40.375 -59 58 41.47   21.76   20.97   ~ 11 0
7 [PLH2002] CX13 CV* 19 10 40.610 -60 00 05.91   24.60   24.32   ~ 9 0
8 [PLH2002] CX16 BY* 19 10 42.531 -59 58 43.03   19.39   18.33   ~ 5 0
9 [PLH2002] CX34 ** 19 10 45.694 -59 58 20.09   22.04   20.23   ~ 2 0
10 [PLH2002] CX39 G 19 10 46.352 -59 57 49.92   24.86   22.26   ~ 2 0
11 [PLH2002] CX21 CV? 19 10 49.516 -59 59 43.16   19.06   18.53   ~ 5 0
12 [PLH2002] CX36 CV* 19 10 49.585 -59 58 26.41   24.93   24.85   ~ 5 0
13 [PLH2002] CX40 ** 19 10 50.357 -59 59 13.89   21.18   19.72   ~ 2 0
14 [PLH2002] CX37 ** 19 10 50.509 -59 59 08.77   22.35   20.42   ~ 2 0
15 Cl* NGC 6752 SAW V27 CV* 19 10 51.0764787837 -59 59 12.157923910           ~ 16 0
16 [PLH2002] CX5 CV* 19 10 51.414 -59 59 05.18   19.65   18.57   ~ 11 0
17 [JVH94] NGC 6752 22 CV* 19 10 51.505 -59 59 27.10   24.07   23.87   ~ 10 0
18 Cl* NGC 6752 BRS 2 CV* 19 10 51.511 -59 58 56.85           ~ 18 0
19 Cl* NGC 6752 SAW V25 CV* 19 10 51.586 -59 59 01.73   21.09   20.10   ~ 18 0
20 [PLH2002] CX9 CV? 19 10 51.766 -59 58 59.25   24.40   22.42   ~ 8 0
21 [PLH2002] CX25 CV? 19 10 51.957 -59 58 40.55   25.73   25.51   ~ 5 0
22 [PLH2002] CX18 X 19 10 52.006 -59 59 03.69           ~ 6 0
23 [PLH2002] CX14 X 19 10 52.039 -59 59 09.12           ~ 6 0
24 [PLH2002] CX27 ** 19 10 52.059 -59 59 00.84   21.65   20.13   ~ 2 0
25 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
26 [PLH2002] CX35 CV? 19 10 52.165 -59 59 16.73   24.89   24.11   ~ 5 0
27 [PLH2002] CX29 CV? 19 10 52.293 -59 59 01.79   22.49   20.83   ~ 3 0
28 [PLH2002] CX11 CV* 19 10 52.376 -59 59 05.56           ~ 8 0
29 [PLH2002] CX23 CV? 19 10 52.546 -59 59 04.38   20.68   19.58   ~ 5 0
30 [PLH2002] CX24 CV? 19 10 52.670 -59 59 03.21   22.97   22.66   ~ 5 0
31 [PLH2002] CX12 X 19 10 52.694 -59 59 03.27           ~ 6 0
32 [PLH2002] CX20 ** 19 10 52.848 -59 59 02.54   21.99   20.20   ~ 2 0
33 [PLH2002] CX32 CV? 19 10 54.137 -59 59 11.04   22.12   20.54   ~ 5 0
34 [PLH2002] CX10 AGN 19 10 54.754 -59 59 13.86   20.16   19.70   ~ 7 0
35 [PLH2002] CX19 ** 19 10 55.600 -59 59 17.33   18.35   17.58   ~ 8 0
36 [PLH2002] CX15 AGN 19 10 55.847 -59 57 45.78   23.05   22.66   ~ 7 0
37 [G93] NGC 6752 D CV* 19 10 56.005 -59 59 37.33           ~ 12 0
38 [PLH2002] CX38 ** 19 11 02.151 -59 58 11.81   20.34   19.15   ~ 2 0
39 [PLH2002] CX8 CV? 19 11 02.944 -59 59 41.89           ~ 6 0
40 [PLH2002] CX17 G 19 11 05.258 -59 59 04.42           ~ 6 0
41 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0

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