2005A&A...432..181M


Query : 2005A&A...432..181M

2005A&A...432..181M - Astronomy and Astrophysics, volume 432, 181-187 (2005/3-2)

Hysteresis in spectral state transitions - a challenge for theoretical modeling.

MEYER-HOFMEISTER E., LIU B.F. and MEYER F.

Abstract (from CDS):

Many low-mass X-ray binaries show both hard and soft spectral states. For several sources the transitions between these states have been observed, mostly from the soft to the hard state during a luminosity decrease. In a few cases also the transition from the hard to the soft state was observed, coincident with an increase of the luminosity. Surprisingly this luminosity was not the same as the one during a following change back to the hard state. The values differed by a factor of about 3 to 5. We present a model for this hysteresis in the light curves of low-mass X-ray binaries (sources with neutron stars or black holes). We show that the different amount of Compton cooling or heating acting on the accretion disk corona at the time of the transition causes this switch in the accretion mode at different mass accretion rates and therefore different luminosities. The inner disk during the soft state provides a certain amount of Compton cooling which is either not present or much less if the inner region is filled with a hot advection-dominated accretion flow (ADAF) that radiates a hard spectrum.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - X-rays: binaries - stars: neutron

Simbad objects: 13

goto Full paper

goto View the references in ADS

Number of rows : 13
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 X LMC X-3 HXB 05 38 56.6323605504 -64 05 03.317937504   17 17.2     B2.5Ve 646 0
2 X LMC X-1 HXB 05 39 38.8284304464 -69 44 35.531553624   14.8 14.5     O8(f)p 601 2
3 V* GU Mus HXB 11 26 26.5961559600 -68 40 32.877752952           K3V-K7V 690 1
4 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1098 0
5 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 871 1
6 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 369 0
7 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1932 0
8 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 658 1
9 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 374 1
10 X Aql X-1 LXB 19 11 16.0571313336 +00 35 05.868232692           ~ 1080 1
11 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2452 0
12 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4121 0
13 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1867 2

To bookmark this query, right click on this link: simbad:objects in 2005A&A...432..181M and select 'bookmark this link' or equivalent in the popup menu


2022.08.09-02:52:49

© Université de Strasbourg/CNRS

    • Contact