2010A&A...519A..69A


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.26CEST12:13:48

2010A&A...519A..69A - Astronomy and Astrophysics, volume 519, A69-69 (2010/9-1)

Wavelet and R/S analysis of the X-ray flickering of cataclysmic variables.

ANZOLIN G., TAMBURINI F., DE MARTINO D. and BIANCHINI A.

Abstract (from CDS):

Recently, wavelets and R/S analysis have been used as statistical tools to characterize the optical flickering of cataclysmic variables. Here we present the first comprehensive study of the statistical properties of X-ray flickering of cataclysmic variables in order to link them with physical parameters. We analyzed a sample of 97 X-ray light curves of 75 objects of all classes observed with the XMM-Newton space telescope. By using the wavelets analysis, each light curve has been characterized by two parameters, α and Σ, that describe the energy distribution of flickering on different timescales and the strength at a given timescale, respectively. We also used the R/S analysis to determine the Hurst exponent of each light curve and define their degree of stochastic memory in time. The X-ray flickering is typically composed of long time scale events (1.5≲α≲3), with very similar strengths in all the subtypes of cataclysmic variables (-3≲Σ≲-1.5). The X-ray data are distributed in a much smaller area of the α-Σ parameter space with respect to those obtained with optical light curves. The tendency of the optical flickering in magnetic systems to show higher Σ values than the non-magnetic systems is not encountered in the X-rays. The Hurst exponents estimated for all light curves of the sample are larger than those found in the visible, with a peak at 0.82. In particular, we do not obtain values lower than 0.5. The X-ray flickering presents a persistent memory in time, which seems to be stronger in objects containing magnetic white dwarf primaries. The similarity of the X-ray flickering in objects of different classes together with the predominance of a persistent stochastic behavior can be explained in terms of magnetically-driven accretion processes acting in a considerable fraction of the analyzed objects.

Abstract Copyright:

Journal keyword(s): novae, cataclysmic variables - X-rays: binaries - accretion, accretion disks - magnetic fields - methods: data analysis

Simbad objects: 85

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Number of rows : 85

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* WW Cet DN* 00 11 24.7725920913 -11 28 43.204274910           ~ 163 0
2 V* V709 Cas DQ* 00 28 48.8268573576 +59 17 22.032796584           ~ 112 0
3 V* HT Cas DN* 01 10 13.1213309510 +60 04 35.489284826           M5.5e 363 0
4 V* AI Tri AM* 02 03 48.6152251668 +29 59 25.898735063           M2.5 39 1
5 V* TT Ari No* 02 06 53.0797667881 +15 17 41.849759579   10.73 10.20     Bep: 415 0
6 V* WX Hyi DN* 02 09 50.8239743875 -63 18 39.830688329   10.70     13.038 ~ 191 0
7 V* XY Ari DQ* 02 56 08.185 +19 26 34.12           ~ 134 1
8 V* EF Eri NL* 03 14 13.2527107604 -22 35 42.917018996   15.4 14.53 13.5   ~ 409 0
9 V* GK Per No* 03 31 12.0096626899 +43 54 15.467450081   10.2 14.0     K1IV 855 0
10 V* UZ For AM* 03 35 28.6515678221 -25 44 21.765602833   18.2       M4.5 242 0
11 V* VW Hyi DN* 04 09 11.3966476826 -71 17 41.555169342   12.00 12.30 14.16   ?+L0:e 608 0
12 RX J0425.6-5714 AM* 04 25 38.6075199684 -57 14 36.210122720   19.1       ~ 10 1
13 1ES 0439-68.2 CV* 04 39 49.64 -68 09 01.4   21.5 21.7     Ss 55 0
14 V* UU Col DQ* 05 12 13.2336376173 -32 41 39.746182397   17.72       ~ 38 0
15 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 304 0
16 V* V1309 Ori AM* 05 15 41.4123841919 +01 04 40.479107028           M0.5 97 0
17 V* BY Cam AM* 05 42 48.8013255299 +60 51 31.375887904   16.60       ~ 231 0
18 2E 1550 XB* 05 43 34.1600994175 -68 22 22.189299745   15.9   17.2 16.54 ~ 304 0
19 OGLE LMC-SC20 113500 EB* 05 46 46.54 -71 08 53.9     19.163   18.886 ~ 239 0
20 V* SS Aur CV* 06 13 22.4341940496 +47 44 25.346818461   16.06 15.81     sdBe 243 0
21 V* MU Cam XB* 06 25 16.2520524762 +73 34 39.104874988       14.3   ~ 60 0
22 V* V418 Gem XB* 07 04 08.6690661945 +26 25 10.767757487           ~ 23 0
23 V* HS Cam AM* 07 19 14.5151105423 +65 57 44.305352490   19.01       ~ 23 0
24 V* PQ Gem DQ* 07 51 17.3278781437 +14 44 23.875020784           ~ 203 0
25 V* U Gem DN* 07 55 05.2323858391 +22 00 05.045435077   15.3 14.54     DA 1034 0
26 V* HT Cam DQ* 07 57 01.3365989918 +63 06 02.000878897   16.36       ~ 66 0
27 V* Z Cha DN* 08 07 27.7421647579 -76 32 00.679589237   12.00       M5.5 583 1
28 V* YZ Cnc DN* 08 10 56.6513272947 +28 08 33.259393864     15.24     ~ 240 0
29 V* CP Pup No* 08 11 46.0634990913 -35 21 04.986286529   15.0 15.00     ~ 244 1
30 V* SU UMa DN* 08 12 28.2694633475 +62 36 22.428029272           B2 462 0
31 V* IX Vel No* 08 15 18.9691696308 -49 13 20.669663769 8.64 10.04 10.10 9.84 9.347 sdOBe 216 0
32 V* Z Cam DN* 08 25 13.1988897787 +73 06 39.284432670   11.85 10.00     ~ 481 0
33 V* EI UMa DN* 08 38 21.9952271575 +48 38 02.163591536   14.9 14.78     ~ 72 1
34 RX J0925.7-4758 XB* 09 25 46.0017213799 -47 58 17.339989324   19.2       ~ 85 0
35 V* VZ Sex DN* 09 44 31.6824200550 +03 58 05.308838856     12.8     ~ 29 0
36 V* OY Car DN* 10 06 22.0792108747 -70 14 04.582997921           ~ 546 0
37 RX J1007.5-2017 AM* 10 07 34.6534874108 -20 17 32.448845919     18.0     ~ 25 0
38 V* SW Sex NL* 10 15 09.3650789592 -03 08 32.962346997           ~ 179 0
39 V* GG Leo AM* 10 15 34.6778640025 +09 04 41.987298295           ~ 43 0
40 V* DW UMa CV* 10 33 52.8751166936 +58 46 54.719916520   14.33   14.33 14.35 ~ 211 0
41 LP 731-60 DN* 10 50 10.8033679538 -14 04 36.759700652     16.76     ~ 20 0
42 V* AN UMa AM* 11 04 25.6556953228 +45 03 13.941355292     14.90     ~ 243 0
43 V* QZ Vir DN* 11 38 26.8240425768 +03 22 07.110214355     15.81     ~ 237 1
44 V* AM CVn CV* 12 34 54.6230046722 +37 37 44.120772480   14.02 14.13 14.47   DBnnp 373 0
45 V* EX Hya DN* 12 52 24.2220533405 -29 14 56.001981146   13.51 13.49 13.55   M5-6V 642 0
46 V* GP Com NL* 13 05 42.4008232413 +18 01 03.765282516   15.59   15.9   DBe 235 0
47 V* EV UMa AM* 13 07 53.8583243765 +53 51 30.498937628           ~ 59 0
48 2XMMp J131223.4+173659 AM* 13 12 23.4757159348 +17 36 59.206012851           ~ 7 0
49 V* V396 Hya No* 13 12 46.4403299058 -23 21 32.601548727   18.9   17.5   DD 80 0
50 V* UX UMa NL* 13 36 40.9533414077 +51 54 49.424110262   12.78 13.26     Oev: 493 0
51 V* CR Boo DN* 13 48 55.1859261603 +07 57 35.927051968           ~ 163 0
52 V* V834 Cen AM* 14 09 07.2853539143 -45 17 16.015131476   16.0       M6.5 297 0
53 V* HP Lib CV* 15 35 53.0716707077 -14 13 12.217891145   13.55       Bpec 85 0
54 V* NY Lup XB* 15 48 14.5960047636 -45 28 39.918343697     14.50 14.42   K0/3Ve 78 1
55 V* V2400 Oph DQ* 17 12 36.4232271717 -24 14 44.775129023     14.5     ~ 127 0
56 V* V795 Her No* 17 12 56.1686428004 +33 31 19.239210099   12.53 12.64 12.69   ~ 162 0
57 V* V2731 Oph DQ* 17 30 21.50 -05 59 33.5           ~ 70 0
58 V* V2487 Oph No* 17 31 59.805 -19 13 56.13   18.0       ~ 100 0
59 V* V442 Oph No* 17 32 15.1362979611 -16 15 22.067845629   12.60       ~ 78 0
60 V* V2301 Oph NL* 18 00 35.5318080632 +08 10 13.920659251           ~ 87 0
61 V* V1323 Her CV* 18 03 39.6643567211 +40 12 20.266605309   17.3   17.2   ~ 16 0
62 V* V426 Oph DN* 18 07 51.6921098903 +05 51 47.802415954           ~ 156 0
63 V* AM Her AM* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 903 0
64 V* V347 Pav AM* 18 44 48.2635326025 -74 18 34.218756613           ~ 57 0
65 V* V603 Aql No* 18 48 54.6369118792 +00 35 02.855110952 10.73 11.65 11.64     OB+e: 504 0
66 V* V1223 Sgr DQ* 18 55 02.3109253503 -31 09 49.589704079           ~ 299 0
67 NOVA Sgr 2002 c No* 19 01 09.38 -22 00 05.9           ~ 122 0
68 V* EP Dra AM* 19 07 06.1869434379 +69 08 43.874477498   18       ~ 55 0
69 RX J1914.4+2456 XB* 19 14 26.09 +24 56 44.6           ~ 121 0
70 V* QS Tel AM* 19 38 35.8145594082 -46 12 57.107614734           ~ 110 0
71 NOVA Cyg 2008 b No* 19 43 01.9773145314 +32 19 13.545320806 18.27 18.72 18.03 17.72 17.41 ~ 134 0
72 V* AB Dra DN* 19 49 06.5316904125 +77 44 23.339425388   12.00       ~ 109 0
73 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 882 0
74 V* AE Aqr DQ* 20 40 09.1598509019 -00 52 15.057042857   12.46 10.40   10.191 K3-5IV/V 599 0
75 V* HU Aqr AM* 21 07 58.1945403160 -05 17 40.557984218   15.1   15.4   D+M4V 249 1
76 V* CD Ind AM* 21 15 41.0456943110 -58 40 54.060875785           ~ 77 0
77 RX J2133.7+5107 CV* 21 33 43.6347819631 +51 07 24.730222487   15.80       ~ 61 0
78 V* CE Gru AM* 21 37 56.38 -43 42 13.1   19.5       ~ 34 0
79 V* SS Cyg DN* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1198 1
80 V* LS Peg DN* 21 51 57.9372002301 +14 06 53.267732979   11.89 12.10 12.18   ~ 81 0
81 V* FO Aqr DQ* 22 17 55.3796324299 -08 21 03.755362145           ~ 320 0
82 V* TY PsA DN* 22 49 39.9046847942 -27 06 53.138810237   15.61 15.67 16.19   DA 95 0
83 GD 552 DN* 22 50 39.9585471609 +63 28 38.333079055   16 16.47     ~ 51 1
84 V* AO Psc DQ* 22 55 17.9860142780 -03 10 39.982033015           ~ 284 0
85 GD 1662 NL* 23 29 00.4711137193 -29 46 45.980626470           OBe 142 0

    Equat.    Gal    SGal    Ecl

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2019.08.26-12:13:48

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