2015A&A...579A..50B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:31:30

2015A&A...579A..50B - Astronomy and Astrophysics, volume 579A, 50-50 (2015/7-1)

Time lags of the flickering in cataclysmic variables as a function of wavelength.

BRUCH A.

Abstract (from CDS):

Flickering is a ubiquitous phenomenon in cataclysmic variables (CVs). Although the underlying light source is one of the main contributors to the optical radiation, the mechanism leading to flickering is not understood as yet. The present study aims to contribute to the set of boundary conditions, defined by observations, which must be met by physical models that describe the flickering. In particular, time lags in the occurrence of flickering events at different wavelengths over the optical range are examined. To this end, the cross-correlation functions (CCFs) of numerous light curves of a sample of CVs are analysed that were observed simultaneously or quasi-simultaneously in different bands of various photometric systems. Deviations of the maxima of the CCFs from zero time-shift indicate a dependence of the flickering activity on the wavelength in the sense that flickering flares reach their maxima slightly earlier in the blue range than in the red. While the available observational material does not permit detecting this individually in all observed systems, the ensemble of all data clearly shows this effect. Particularly instructive are the cases of V603 Aql and TT Ari, where time lags of 15.1s and 4.3s, respectively, are observed between the U and R bands. In principle this can be understood if during the development of a flickering flare the radiation characteristics of the light source responsible for flickering change such that in the early phases of a flare more short-wavelength radiation is emitted, and later on, the peak of the emission shifts to the red. Respective scenarios are discussed and shown to be in qualitative and quantitative agreement with observations.

Abstract Copyright:

Journal keyword(s): binaries: close - stars: variables: general - novae, cataclysmic variables

Simbad objects: 31

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Number of rows : 31

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 V* WW Cet DN* 00 11 24.7725920913 -11 28 43.204274910           ~ 165 0
2 V* V709 Cas DQ* 00 28 48.8268573576 +59 17 22.032796584           ~ 113 0
3 V* RX And DN* 01 04 35.5373041151 +41 17 57.783687786   11.99 12.43     ~ 299 0
4 V* HT Cas DN* 01 10 13.1213309510 +60 04 35.489284826           M5.5e 366 0
5 V* TT Ari No* 02 06 53.0797667881 +15 17 41.849759579   10.73 10.20     Bep: 418 0
6 V* RW Tri NL* 02 25 36.1555561414 +28 05 50.893091344   13.50 12.50     M0V 287 0
7 V* GK Per No* 03 31 12.0096626899 +43 54 15.467450081   10.2 14.0     K1IV 866 0
8 V* CN Ori DN* 05 52 07.7840511235 -05 25 00.542923401           ~ 172 0
9 V* LU Cam DN* 05 58 17.8723907014 +67 53 46.054564955           ~ 14 0
10 V* KR Aur No* 06 15 43.9180386147 +28 35 08.574183087           ~ 146 0
11 V* U Gem DN* 07 55 05.2323858391 +22 00 05.045435077   15.3 14.54     DA 1046 0
12 V* IX Vel No* 08 15 18.9691696308 -49 13 20.669663769 8.64 10.04 10.10 9.84 9.347 sdOBe 217 0
13 V* QU Car No* 11 05 42.4860917672 -68 37 58.231655042 10.74 11.45 11.54 11.57   A 94 0
14 V* DO Dra DN* 11 43 38.4924789768 +71 41 20.559348288       13.747   DQ 195 1
15 V* BV Cen DN* 13 31 19.5106066705 -54 58 33.654781044   13.17 13.258   12.226 G5-8IV/V 177 0
16 V* UX UMa NL* 13 36 40.9533414077 +51 54 49.424110262   12.78 13.26     Oev: 498 0
17 V* T CrB Sy* 15 59 30.1619486506 +25 55 12.607985109   11.516 10.247 9.70   M3IIIe_sh 648 0
18 V* V2051 Oph DN* 17 08 19.0875545832 -25 48 31.695764973   17.5       ~ 225 0
19 V* V795 Her No* 17 12 56.1686428004 +33 31 19.239210099   12.53 12.64 12.69   ~ 163 0
20 V* RS Oph No* 17 50 13.1592776879 -06 42 28.481553668   12.29 4.30     OB+M2ep 922 0
21 V* V426 Oph DN* 18 07 51.6921098903 +05 51 47.802415954           ~ 156 0
22 V* AM Her AM* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 911 0
23 V* V603 Aql No* 18 48 54.6369118792 +00 35 02.855110952 10.73 11.65 11.64     OB+e: 511 0
24 V* MV Lyr No* 19 07 16.2886975947 +44 01 07.867270712   12.18 12.843   12.578 M5Ve 249 0
25 V* AE Aqr DQ* 20 40 09.1598509019 -00 52 15.057042857   12.46 10.40   10.191 K3-5IV/V 606 0
26 V* HR Del No* 20 42 20.3467536529 +19 09 39.304605595   12.46 3.70 12.69   ~ 461 0
27 V* SS Cyg DN* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1211 1
28 V* RU Peg DN* 22 14 02.5507273174 +12 42 11.275480341     12     sdBe+G8IV:n 289 0
29 V* AO Psc DQ* 22 55 17.9860142780 -03 10 39.982033015           ~ 286 0
30 V* IP Peg DN* 23 23 08.5362716048 +18 24 59.206210572           M2 358 0
31 GD 1662 NL* 23 29 00.4711137193 -29 46 45.980626470           OBe 142 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:31:31

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