2008A&A...488..249S

Query : 2008A&A...488..249S

2008A&A...488..249S - Astronomy and Astrophysics, volume 488, 249-255 (2008/9-2)

XMM-Newton observations of the low-mass X-ray binary XB 1832-330 in the galactic globular cluster NGC 6652.

SIDOLI L., LA PALOMBARA N., OOSTERBROEK T. and PARMAR A.N.

Abstract (from CDS):

We report on two XMM-Newton observations performed in 2006 of the luminous low-mass X-ray binary XB 1832-330, which is located in the galactic globular cluster NGC 6652 and is probably an ultracompact binary (orbital period, Porb, of <1h). The aim of these observations is to investigate the low-energy absorption towards XB 1832-330 and in particular to search for the Ne-rich material local to the binary, which has been suggested as a possible spectral signature of Neon-rich, degenerate companions. XMM-Newton observed the source twice, in 2006 September and October. High resolution spectroscopy with the XMM-Newton RGS was used to estimate the ratio of the neutral neon-to-oxygen column densities to search for an anomalous Ne abundance in this X-ray binary. We find no evidence of anomalous Ne/O ratios, finding Ne/O=0.18±0.06 and Ne/O=0.17±0.03 (1σ uncertainties) in the two observations. These values are consistent with the one in the interstellar medium. Timing analysis of EPIC data suggests possible periodicities at 9170±235s and 18616±531s, which need confirmation. A by-product of these observations consists of the spatial analysis of the source field, which resulted in the detection of 46 faint sources within the EPIC field of view, which are not present in the Second XMM-Newton Serendipitous Source Catalogue. All these faint sources are probably foreground objects. We performed the first high spectral resolution observations of XB 1832-330, a probable ultracompact binary, without finding any evidence of an anomalous Ne abundance.

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Journal keyword(s): X-rays: individuals: XB 1832-330 - stars: neutron - X-rays: binaries - accretion, accretion disks

Simbad objects: 54

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Number of rows : 54
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 4U 0513-40 LXB 05 14 06.59 -40 02 37.0           ~ 166 1
2 V* V1055 Ori LXB 06 17 07.3565603963 +09 08 13.515857360   18.80 18.5     ~ 560 1
3 4U 0919-54 LXB 09 20 26.4818170056 -55 12 24.512806404 20.40 21.30 21.0     ~ 164 0
4 V* QU TrA LXB 15 47 54.6 -62 34 06           ~ 156 0
5 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 991 1
6 XMMU J183442.8-325840 X 18 34 42.0 -32 58 40           ~ 1 0
7 XMMU J183446.9-330143 X 18 34 46.0 -33 01 43           ~ 1 0
8 XMMU J183448.4-330107 X 18 34 48.0 -33 01 07           ~ 1 0
9 XMMU J183450.7-325705 X 18 34 50.0 -32 57 05           ~ 1 0
10 XMMU J183453.2-325851 X 18 34 53.0 -32 58 51           ~ 1 0
11 XMMU J183455.9-324948 X 18 34 55.0 -32 49 48           ~ 1 0
12 XMMU J183458.3-330548 X 18 34 58.0 -33 05 48           ~ 1 0
13 XMMU J183459.5-325430 X 18 34 59.0 -32 54 30           ~ 1 0
14 XMMU J183502.4-330257 X 18 35 02.0 -33 02 57           ~ 1 0
15 XMMU J183507.4-325911 X 18 35 07.0 -32 59 11           ~ 1 0
16 XMMU J183509.6-325607 X 18 35 09.0 -32 56 07           ~ 1 0
17 XMMU J183512.1-330324 X 18 35 12.0 -33 03 24           ~ 1 0
18 XMMU J183512.8-324755 X 18 35 12.0 -32 47 55           ~ 1 0
19 XMMU J183514.1-325623 X 18 35 14.0 -32 56 23           ~ 1 0
20 XMMU J183514.8-325354 X 18 35 14.0 -32 53 54           ~ 1 0
21 XMMU J183515.5-330637 X 18 35 15.0 -33 06 37           ~ 1 0
22 XMMU J183515.1-325016 X 18 35 15.0 -32 50 16           ~ 1 0
23 XMMU J183515.9-324703 X 18 35 15.0 -32 47 03           ~ 1 0
24 XMMU J183516.1-330602 X 18 35 16.0 -33 06 02           ~ 1 0
25 XMMU J183516.1-325724 X 18 35 16.0 -32 57 24           ~ 1 0
26 XMMU J183523.7-324836 X 18 35 23.0 -32 48 36           ~ 1 0
27 XMMU J183526.1-330933 X 18 35 26.0 -33 09 33           ~ 1 0
28 XMMU J183526.9-325422 X 18 35 26.0 -32 54 22           ~ 1 0
29 XMMU J183529.7-324734 X 18 35 29.0 -32 47 34           ~ 1 0
30 XMMU J183535.3-330808 X 18 35 35.0 -33 08 08           ~ 1 0
31 XMMU J183536.7-325217 X 18 35 36.0 -32 52 17           ~ 1 0
32 XMMU J183538.5-325139 X 18 35 38.0 -32 51 39           ~ 1 0
33 XMMU J183538.4-324701 X 18 35 38.0 -32 47 01           ~ 1 0
34 XMMU J183539.1-324747 X 18 35 39.0 -32 47 47           ~ 1 0
35 XMMU J183541.1-325339 X 18 35 41.0 -32 53 39           ~ 1 0
36 XMMU J183542.4-331107 X 18 35 42.0 -33 11 07           ~ 1 0
37 Cl* NGC 6652 SAW V10 LXB 18 35 43.649 -32 59 26.77     18.9     ~ 98 0
38 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 437 0
39 XMMU J183546.9-330617 X 18 35 46.0 -33 06 17           ~ 1 0
40 XMMU J183548.1-331137 X 18 35 48.0 -33 11 37           ~ 1 0
41 XMMU J183611.0-330725 X 18 36 11.0 -33 07 25           ~ 1 0
42 XMMU J183613.6-330039 X 18 36 13.0 -33 00 39           ~ 1 0
43 XMMU J183614.3-325949 X 18 36 14.0 -32 59 49           ~ 1 0
44 XMMU J183619.7-330714 X 18 36 19.0 -33 07 14           ~ 1 0
45 XMMU J183619.4-330357 X 18 36 19.0 -33 03 57           ~ 1 0
46 XMMU J183622.4-325338 X 18 36 22.0 -32 53 38           ~ 1 0
47 XMMU J183628.7-330409 X 18 36 28.0 -33 04 09           ~ 1 0
48 XMMU J183628.0-330001 X 18 36 28.0 -33 00 01           ~ 1 0
49 XMMU J183629.8-330208 X 18 36 29.0 -33 02 08           ~ 1 0
50 XMMU J183630.2-330708 X 18 36 30.0 -33 07 08           ~ 1 0
51 XMMU J183632.8-330509 X 18 36 32.0 -33 05 09           ~ 1 0
52 XMMU J183632.9-325653 X 18 36 32.0 -32 56 53           ~ 1 0
53 XMMU J183638.7-325144 X 18 36 38.0 -32 51 44           ~ 1 0
54 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 252 1

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