2017A&A...600A..95H


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:37:23

2017A&A...600A..95H - Astronomy and Astrophysics, volume 600A, 95-95 (2017/4-1)

Hystereses in dwarf nova outbursts and low-mass X-ray binaries.

HAMEURY J.-M., LASOTA J.-P., KNIGGE C. and KORDING E.G.

Abstract (from CDS):

Context. The disc instability model (DIM) successfully explains why many accreting compact binary systems exhibit outbursts during which their luminosity increases by orders of magnitude. The DIM correctly predicts which systems should be transient and works regardless of whether the accretor is a black hole, a neutron star, or a white dwarf. However, it has been known for some time that the outbursts of X-ray binaries, which contain neutron-star or black-hole accretors, exhibit hysteresis in the X-ray hardness-intensity diagram (HID). More recently, it has been shown that the outbursts of accreting white dwarfs also show hysteresis, but in a diagram combining optical, EUV, and X-ray fluxes.
Aims. We examine the nature of the hysteresis observed in cataclysmic variables and low-mass X-ray binaries.
Methods. We used our disc evolution code for modelling dwarf nova outbursts, and constructed the hardness intensity diagram as predicted by the disc instability model.
Results. We show explicitly that the standard DIM, modified only to account for disc truncation, can explain the hysteresis observed in accreting white dwarfs, but cannot explain that observed in X-ray binaries.
Conclusions. The spectral evidence for the existence of different accretion regimes or components (disc, corona, jets, etc.) should only be based on wavebands that are specific to the innermost parts of the discs, i.e. EUV and X-rays; this task is difficult because of interstellar absorption. The existing data, however, indicate that a hysteresis is in the EUV - X-ray domain is present in SS Cyg.

Abstract Copyright: © ESO, 2017

Journal keyword(s): accretion, accretion disks - stars: dwarf novae - X-rays: binaries - instabilities - instabilities

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* RX And DN* 01 04 35.5373041151 +41 17 57.783687786   11.99 12.43     ~ 299 0
2 V* VW Hyi DN* 04 09 11.3966476826 -71 17 41.555169342   12.00 12.30 14.16   ?+L0:e 617 0
3 V* YZ Cnc DN* 08 10 56.6513272947 +28 08 33.259393864     15.24     ~ 240 0
4 V* EX Dra DN* 18 04 14.2486747659 +67 54 12.271788519   14.5 14.7     ~ 113 0
5 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 895 0
6 V* SS Cyg DN* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1218 1

    Equat.    Gal    SGal    Ecl

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2020.11.25-10:37:23

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