2007A&A...465..953I

Query : 2007A&A...465..953I

2007A&A...465..953I - Astronomy and Astrophysics, volume 465953-963 (2007/4-3)

Six new candidate ultracompact X-ray binaries.

IN'T ZAND J.J.M., JONKER P.G. and MARKWARDT C.B.

Abstract (from CDS):

Ultracompact X-ray binaries (UCXBs) appear able to sustain accretion onto the compact accretor at rates lower than in wider X-ray binaries. This may be understood by the smaller accretion disks in UCXBs: a lower X-ray luminosity suffices to keep a disk completely ionized through irradiation and, thus, keep the viscosity at a sufficiently high level to allow effective transport of matter to the compact object. We employ this distinguishing factor on data from RXTE and BeppoSAX to identify six new candidate UCXBs, thus increasing the population by one quarter. The candidates are drawn from the population of persistently accreting and type-I X-ray bursting low-mass X-ray binaries. The X-ray bursts establish the low-mass X-ray binary nature and provide a handle on the accretion rate. We find that the low accretion rates are supported by the long burst recurrence times and the hard X-ray spectra of the persistent emission as derived from the 2nd INTEGRAL catalog of soft γ-ray sources. We discuss the peculiar light curves of some new UCXB candidates.

Abstract Copyright: ∼

Journal keyword(s): X-rays: binaries - X-rays: bursts - accretion, accretion disks

CDS comments: 1RXS J172525.2-325717 is 1RXS J172525.5-325717 in Simbad. Paragraph 5.4 SLX 1735-369 is a misprint for SLX 1735-269. Table 1 NGC 6652B is [HEG2001] B in Simbad (2001ApJ...562..363H). Table 1 omega Cen qLMXB = CXOU J132619.7-472910 in SIMBAD (2004ApJ...613..512H).

Simbad objects: 65

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Number of rows : 65
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 4U 0513-40 LXB 05 14 06.59 -40 02 37.0           ~ 176 1
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 V* V1055 Ori LXB 06 17 07.3565603963 +09 08 13.515857360   18.80 18.5     ~ 594 1
4 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 660 0
5 4U 0919-54 LXB 09 20 26.4818170056 -55 12 24.512806404 20.40 21.30 21.0     ~ 175 0
6 V* BW Ant LXB 09 29 20.19 -31 23 03.2   18.50 18.63     ~ 194 0
7 4U 1246-58 LXB 12 49 39.4 -59 05 14   19.24 18.99     ~ 103 0
8 V* GR Mus LXB 12 57 37.1833002949 -69 17 18.996899563   19.40 19.1     ~ 275 0
9 2E 3049 X 13 26 19.796 -47 29 10.51   26.8   25.3   ~ 22 0
10 4U 1323-62 LXB 13 26 37.0 -62 08 09           ~ 192 0
11 V* BR Cir HXB 15 20 40.8532547060 -57 10 00.206639033   21.4 21.4     B5-A0I 849 1
12 V* QU TrA LXB 15 47 53.6 -62 34 11           ~ 168 0
13 V* UW CrB LXB 16 05 45.8746697208 +25 51 45.246497976     19.7     ~ 78 0
14 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 626 1
15 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 921 0
16 4U 1642-45 LXB 16 45 48.1 -45 36 42           ~ 467 1
17 V* V1101 Sco LXB 17 05 44.4916006152 -36 25 23.049324480   20.10 18.6     ~ 473 0
18 X Ara X-1 LXB 17 06 15.2 -43 02 11           ~ 296 1
19 1RXS J170855.6-440653 LXB 17 08 54.346 -44 06 08.38           ~ 406 1
20 4U 1705-32 LXB 17 08 55.1 -32 18 49           ~ 66 0
21 [KRL2007b] 225 LXB 17 10 12.8 -28 07 52           ~ 104 0
22 4U 1708-40 LXB 17 12 23.6 -40 50 36           ~ 70 0
23 [KRL2007b] 228 LXB 17 12 37.0 -37 38 42     12.25     ~ 81 0
24 RX J1718.4-4029 LXB 17 18 24.13 -40 29 30.4           ~ 50 0
25 [KRL2007b] 238 LXB 17 25 25.9 -32 57 13     14.50     ~ 54 0
26 ESO 454-29 GlC 17 27 33.24 -30 48 07.8           ~ 278 0
27 4U 1722-30 LXB 17 27 33.25 -30 48 07.4     12.50     ~ 278 1
28 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 329 1
29 NAME Slow Burster LXB 17 31 58.0 -33 49 58     15.50     ~ 865 1
30 1ES 1735-26.9 LXB 17 38 17.6 -26 59 39           ~ 177 0
31 V* V926 Sco LXB 17 38 58.2384053021 -44 27 00.699118812 16.90 17.70 17.5     ~ 480 0
32 2E 1737.5-2817 LXB 17 40 42.84 -28 18 08.5           ~ 87 0
33 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
34 2E 3943 LXB 17 46 05.3 -29 30 52           ~ 217 1
35 AX J1747.4-3000 LXB 17 47 26.0 -30 00 02           ~ 119 0
36 1RXS J174725.6-300241 LXB 17 47 26.2 -30 02 45           ~ 69 0
37 X Sgr X-1 LXB 17 47 56.3 -26 33 47           ~ 402 0
38 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
39 NAME TER 5 X-1 LXB 17 48 05.225 -24 46 47.66           ~ 229 1
40 4U 1746-371 LXB 17 50 12.66 -37 03 08.2     8.43     ~ 206 1
41 4U 1746-370 LXB 17 50 14 -37 02.8           ~ 11 0
42 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 262 0
43 [KRL2007b] 297 LXB 17 59 45.7 -22 01 39           ~ 68 1
44 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 705 1
45 X Sgr X-3 LXB 18 01 32.6 -20 31 45           ~ 254 1
46 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 228 0
47 V* V5512 Sgr LXB 18 14 31.3 -17 09 23     12.73     K5III 449 0
48 4U 1812-12 LXB 18 15 06.4 -12 05 48           ~ 124 2
49 V* NP Ser LXB 18 16 01.7 -14 02 09   18.8       K 683 2
50 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
51 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 1056 1
52 4U 1823-00 LXB 18 25 22.3 -00 00 41   23.00 22     ~ 95 0
53 H 1825-331 X 18 28 -33.1           ~ 8 0
54 V* V4634 Sgr LXB 18 29 28.8 -23 47 48 18.90 19.40 19     ~ 399 0
55 Cl* NGC 6652 SAW V11 LXB 18 35 44.551 -32 59 38.38         18.72 ~ 23 0
56 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
57 V* MM Ser LXB 18 39 57.8 +05 02 13   19.2 19.2     ~ 378 0
58 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 550 0
59 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 266 1
60 4U 1857+01 LXB 19 08 26.97 +00 10 07.7 20.50 21.00 20.5     ~ 132 0
61 V* V1405 Aql LXB 19 18 47.6 -05 14 18 20.90 21.40 21.0     ~ 495 0
62 CXOU J212958.1+121002 XB* 21 29 58.06 +12 10 02.6     16.6     ~ 87 1
63 4U 2129+12 LXB 21 29 58.3124 +12 10 02.670 14.50 15.70 15.8     ~ 326 1
64 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
65 V* V1341 Cyg LXB 21 44 41.1544345272 +38 19 17.066570988 15.00 15.13 14.68 15.00   A9III 1229 1

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