2009A&A...508..329M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET12:06:23

2009A&A...508..329M - Astronomy and Astrophysics, volume 508, 329-337 (2009/12-2)

The hard to soft spectral transition in LMXBs-affected by recondensation of gas into an inner disk.

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

Abstract (from CDS):

Soft and hard spectral states of X-ray transient sources reflect two modes of accretion, accretion via a geometrically thin, optically thick disk or an advection-dominated accretion flow (ADAF). The luminosity at transition between these two states seems to vary from source to source, or even for the same source during different outbursts, as observed for GX 339-4. We investigate how the existence of an inner weak disk in the hard state affects the transition luminosity. We evaluate the structure of the corona above an outer truncated disk and the resulting disk evaporation rate for different irradiation. In some cases, recent observations of X-ray transients indicate the presence of an inner cool disk during the hard state. Such a disk can remain during quiescence after the last outburst as long as the luminosity does not drop to very low values (10–4-10–3 of the Eddington luminosity). Consequently, as part of the matter accretes via the inner disk, the hard irradiation is reduced. The hard irradiation is further reduced, occulted and partly reflected by the inner disk. This leads to a hard-soft transition at a lower luminosity. The spectral state transition is expected at lower luminosity if an inner disk exists below the ADAF. This seems to be supported by observations for GX 339-4.

Abstract Copyright:

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

Simbad objects: 20

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Number of rows : 20

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 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1050 0
2 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 733 0
3 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 675 1
4 V* IL Lup HXB 15 47 08.2766679321 -47 40 10.284971214     11.96     ~ 423 1
5 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1056 0
6 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 357 0
7 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1741 1
8 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1811 0
9 SAX J1711.6-3808 XB* 17 11 37.1 -38 07 06           ~ 36 0
10 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 642 1
11 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3599 3
12 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 626 0
13 2MAXI J1753-013 LXB 17 53 28.2897263704 -01 27 06.256526637 15.30 16.73 16.46 16.15 15.64 ~ 299 0
14 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 366 1
15 [KRL2007b] 312 LXB 18 17 43.537 -33 01 07.80           ~ 142 0
16 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 405 1
17 [KRL2007b] 353 HXB 19 08 53.080 +09 23 04.84     15.80     ~ 87 0
18 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1034 1
19 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3982 0
20 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1121 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-12:06:23

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