2008A&A...480..397S


Query : 2008A&A...480..397S

2008A&A...480..397S - Astronomy and Astrophysics, volume 480, 397-407 (2008/3-3)

XMM-Newton observations of the Galactic globular clusters NGC 2808 and NGC 4372.

SERVILLAT M., WEBB N.A. and BARRET D.

Abstract (from CDS):

Galactic globular clusters harbour binary systems that are detected as faint X-ray sources. These close binaries are thought to play an important role in the stability of the clusters by liberating energy and delaying the inevitable core collapse of globular clusters. The inventory of close binaries and their identification is therefore essential. We present XMM-Newton observations of two Galactic globular clusters: NGC 2808 and NGC 4372. We use X-ray spectral and variability analysis combined with ultra-violet observations made with the XMM-Newton optical monitor and published data from the Hubble Space Telescope to identify sources associated with the clusters. We compare the results of our observations with estimates from population synthesis models. Five sources out of 96 are likely to be related to NGC 2808. Nine sources are found in the field of view of NGC 4372, none being located inside its half-mass radius. We find one quiescent neutron star low mass X-ray binary candidate in the core of NGC 2808, and propose that the majority of the central sources in NGC 2808 are cataclysmic variables. An estimation leads to 20±10 cataclysmic variables with luminosity above 4.25x1031erg/s. Millisecond pulsars could also be present in the core of NGC 2808, and some sources outside the half-mass radius could possibly be linked to the cluster.

Abstract Copyright:

Journal keyword(s): Galaxy: globular clusters: individual: NGC 2808 - Galaxy: globular clusters: individual: NGC 4372 - X-rays: general - stars: binaries: close

VizieR on-line data: <Available at CDS (J/A+A/480/397): table2.dat table3.dat>

Nomenclature: Table 2: [SWB2008] NGC 2808 CN (Nos C1-C5), [SWB2008] NGC 2808 NN (Nos 1-92). Table 3: [SWB2008] NGC 4372 NN (Nos 1-10).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

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 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3747 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11931 1
3 [SWB2008] NGC 2808 69 X 09 10 59.37 -64 47 00.0           ~ 2 0
4 [SWB2008] NGC 2808 84 X 09 11 18.08 -64 44 00.0           ~ 2 0
5 HD 79548 * 09 11 33.2964756024 -64 51 03.306214800   10.56 10.30     A0V 8 0
6 [SWB2008] NGC 2808 34 X 09 11 37.72 -64 46 00.0           ~ 2 0
7 [SWB2008] NGC 2808 66 X 09 11 37.91 -64 48 00.0           ~ 2 0
8 [SWB2008] NGC 2808 C5 X 09 11 59.27 -64 51 00.0           ~ 2 0
9 [SWB2008] NGC 2808 C3 X 09 12 00.58 -64 52 00.0           ~ 2 0
10 [SWB2008] NGC 2808 C2 X 09 12 01.65 -64 51 00.0           ~ 3 0
11 [DKZ2005] 397 UV 09 12 02.3370 -64 51 53.705           ~ 2 0
12 [DKZ2005] 170 UV 09 12 02.3610 -64 51 38.764           ~ 2 0
13 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1345 0
14 [SWB2008] NGC 2808 C4 X 09 12 03.85 -64 52 00.0           ~ 2 0
15 2MASS J09120430-6450593 X 09 12 04.3035149088 -64 50 59.321031540           ~ 2 0
16 [DKZ2005] 222 UV 09 12 04.3320 -64 51 48.404           ~ 2 0
17 [SWB2008] NGC 2808 72 X 09 12 46.84 -65 04 00.0           ~ 2 0
18 [SWB2008] NGC 2808 48 * 09 13 37.4462341776 -64 58 59.007006732           ~ 2 0
19 [SWB2008] NGC 2808 65 X 09 14 07.11 -64 56 00.0           ~ 2 0
20 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 793 0
21 [SWB2008] NGC 4372 2 X 12 25 10.7 -72 27 03           ~ 2 0
22 [SWB2008] NGC 4372 9 X 12 25 27.760 -72 26 52.07           ~ 1 0
23 ASAS J122532-7228.1 Ro* 12 25 33.5544950896 -72 27 48.333445375   13.991 12.524 12.159 10.456 M0IV-Ve 6 0
24 UCAC2 1112924 Y*? 12 25 38.2965664488 -72 49 24.700783692   16.57 14.96 14.77 11.94 ~ 5 0
25 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 285 0
26 [JVH96] NGC 4372 8 X 12 25 47.7 -72 27 50           ~ 2 0
27 [JVH96] NGC 4372 9 X 12 26 23.5 -72 32 39           ~ 2 0
28 [SWB2008] NGC 4372 4 X 12 26 24.220 -72 32 37.25           ~ 1 0
29 [SWB2008] NGC 4372 5 X 12 26 47.980 -72 42 15.92           ~ 1 0
30 [JVH96] NGC 4372 13 X 12 26 48.0 -72 42 19           ~ 2 0
31 [JVH96] NGC 4372 12 X 12 27 31.0 -72 40 10           ~ 2 0
32 2MASS J12273247-7240135 X 12 27 32.47 -72 40 13.5           ~ 1 0
33 [SWB2008] NGC 4372 8 X 12 27 56.170 -72 41 04.30           ~ 1 0
34 [JVH96] NGC 4372 14 X 12 27 57.6 -72 43 17           ~ 2 0
35 [SWB2008] NGC 4372 6 X 12 28 01.0434110688 -72 43 17.365469628           ~ 1 0
36 [JVH96] NGC 4372 10 X 12 28 09.0 -72 33 37           ~ 2 0
37 [SWB2008] NGC 4372 7 X 12 28 09.690 -72 31 41.34           ~ 1 0
38 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1304 0
39 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2606 0
40 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1910 0
41 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3037 0

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2022.09.24-18:04:02

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