2010A&A...513A..16H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST22:10:36

2010A&A...513A..16H - Astronomy and Astrophysics, volume 513, A16-16 (2010/4-1)

Study of Hubble space telescope counterparts to Chandra X-ray sources in the globular cluster M71.

HUANG R.H.H., BECKER W., EDMONDS P.D., ELSNER R.F., HEINKE C.O. and HSIEH B.C.

Abstract (from CDS):

We report on archival Hubble Space Telescope (HST) observations of the globular cluster M71 (NGC 6838). These observations, covering the core of the globular cluster, were performed by the Advanced Camera for Surveys (ACS) and the Wide Field Planetary Camera 2 (WFPC2). Inside the half-mass radius (rh=1.65') of M71, we find 33 candidate optical counterparts to 25 out of 29 Chandra X-ray sources, while 6 possible optical counterparts to 4 X-ray sources are found outside the half-mass radius. Based on the X-ray and optical properties of the identifications, we find 1 certain and 7 candidate cataclysmic variables (CVs). We also classify 2 X-ray sources as certain and 12 as potential chromospherically active binaries (ABs), respectively. The only star in the error circle of the known millisecond pulsar (MSP) is inconsistent with being the optical counterpart. The number of X-ray faint sources with LX>4x1030erg/s (0.5-6.0keV) found in M71 is higher than extrapolations from other clusters on the basis of either collision frequency or mass. Since the core density of M71 is relatively low, we suggest that those CVs and ABs are primordial in origin.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: M71 - globular clusters: individual: NGC 6838

Nomenclature: Table 2: [HBE2010] sNNa N=38 among (Nos s01-s54b).

Simbad objects: 56

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Number of rows : 56

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3548 0
2 PSR B0021-72W Psr 00 24 06.0580 -72 04 49.088           ~ 66 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 919 0
4 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
5 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 684 0
6 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
7 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1677 0
8 PSR J1701-3006E Psr 17 01 12 -30 06.0           ~ 8 0
9 M 62 GlC 17 01 12.60 -30 06 44.5   8.55 7.39     ~ 512 0
10 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 261 0
11 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1799 1
12 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 662 0
13 V* BY Dra BY* 18 33 55.7719224141 +51 43 08.903033617 10.22 9.23   8.733   K4Ve+K7.5Ve 594 0
14 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1807 0
15 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 758 0
16 [HBE2010] s41 X 19 53 40.30 +18 47 47.1         20.77 ~ 1 0
17 [HBE2010] s01 XB? 19 53 41.45 +18 47 09.7         19.94 ~ 1 0
18 [P2009] NGC 6838-1 XB* 19 53 42.62 +18 45 47.2         16.32 ~ 3 0
19 [HBE2010] s03c ? 19 53 43.61 +18 47 25.1         22.81 ~ 1 0
20 [HBE2010] s03b XB? 19 53 43.62 +18 47 24.4 19.32 19.09     18.11 ~ 1 0
21 [HBE2010] s03a XB? 19 53 43.66 +18 47 24.0 18.68 18.35     17.56 ~ 1 0
22 [HBE2010] s04 XB? 19 53 43.86 +18 45 58.3         16.01 ~ 2 0
23 [HBE2010] s05 X 19 53 44.39 +18 46 10.1         21.79 ~ 1 0
24 [HBE2010] s49b ? 19 53 44.51 +18 48 19.6         18.35 ~ 1 0
25 [HBE2010] s49a ? 19 53 44.52 +18 48 20.1   19.87     16.72 ~ 1 0
26 [HBE2010] s06 XB? 19 53 45.17 +18 46 25.0         16.91 ~ 2 0
27 PSR J1953+1846A Psr 19 53 46.0 +18 46 42           ~ 15 0
28 [HBE2010] s08 Psr 19 53 46.44 +18 47 04.7         19.96 ~ 2 0
29 [HBE2010] s07 XB? 19 53 46.45 +18 46 47.1 16.26 15.16     13.89 ~ 2 0
30 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1024 0
31 [HBE2010] s10 X 19 53 46.68 +18 46 35.9         23.4 ~ 1 0
32 [HBE2010] s12 XB? 19 53 47.23 +18 48 06.0 16.40 15.60     14.82 ~ 2 0
33 [HBE2010] s14a ? 19 53 47.43 +18 48 00.1         20.87 ~ 1 0
34 [HBE2010] s14b ? 19 53 47.45 +18 47 59.4         28 ~ 1 0
35 [HBE2010] s14c ? 19 53 47.47 +18 47 59.9         23.46 ~ 1 0
36 [HBE2010] s15 X 19 53 47.90 +18 45 17.5         19.98 ~ 1 0
37 [HBE2010] s16 X 19 53 48.02 +18 47 17.6 19.9 18.62     16.88 ~ 2 0
38 [HBE2010] s19b XB? 19 53 48.83 +18 46 34.1 19.52 18.93     18.05 ~ 1 0
39 [HBE2010] s18 XB* 19 53 48.84 +18 46 18.9 17.25 16.96     15.92 ~ 2 0
40 [HBE2010] s19a XB? 19 53 48.85 +18 46 33.9 18.20 17.79     16.50 ~ 2 0
41 [HBE2010] s19c XB? 19 53 48.86 +18 46 34.4         20.04 ~ 1 0
42 2MASS J19534895+1847138 XB* 19 53 48.9549424857 +18 47 13.830042566 16.16 15.21 14.87   13.61 ~ 4 0
43 [HBE2010] s21 X 19 53 49.38 +18 45 50.4         26.5 ~ 1 0
44 [HBE2010] s22 X 19 53 49.38 +18 48 00.4 19.01 18.22     17.22 ~ 2 0
45 [EHC2008] s23 XB? 19 53 49.434 +18 45 56.54 18.11 17.75     16.73 ~ 1 0
46 [HBE2010] s24 X 19 53 49.81 +18 46 07.6   20.3     18.16 ~ 2 0
47 [HBE2010] s25 X 19 53 50.71 +18 46 55.1         23.3 ~ 1 0
48 [EHC2008] s26 X 19 53 50.841 +18 47 51.85   19.3     17.50 ~ 2 0
49 [HBE2010] s54b ? 19 53 50.91 +18 48 28.4         20.72 ~ 1 0
50 [HBE2010] s54a XB? 19 53 50.98 +18 48 28.6         14.46 ~ 1 0
51 [HBE2010] s27b XB? 19 53 51.43 +18 46 00.4 19.18 18.41     17.45 ~ 1 0
52 [HBE2010] s27a XB? 19 53 51.48 +18 46 00.5 16.06 15.15 17.42   13.70 ~ 3 0
53 [HBE2010] s28b XB? 19 53 52.71 +18 46 35.8         19.28 ~ 1 0
54 [HBE2010] s28a ? 19 53 52.74 +18 46 35.3         18.81 ~ 1 0
55 2MASS J19535278+1846475 CV* 19 53 52.785 +18 46 47.54 21.0       20.76 ~ 2 0
56 W 64 Rad 20 19.6 +37 02           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-22:10:36

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