2008A&A...486..523L


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET21:14:01

2008A&A...486..523L - Astronomy and Astrophysics, volume 486, 523-528 (2008/8-1)

Stability of helium accretion discs in ultracompact binaries.

LASOTA J.-P., DUBUS G. and KRUK K.

Abstract (from CDS):

Stellar companions of accreting neutron stars in ultra compact X-ray binaries (UCXBs) are hydrogen-deficient. Their helium or C/O accretion discs are strongly X-ray irradiated. Both the chemical composition and irradiation determine the disc stability with respect to thermal and viscous perturbations. At shorter periods, UCXBs are persistent, whereas longer-period systems are mostly transient. To understand this behaviour one has to derive the stability criteria for X-ray irradiated hydrogen-poor accretion discs. We use a modified and updated version of the Dubus et al. code describing time-dependent irradiated accretion discs around compact objects. We obtained the relevant stability criteria and compared the results to observed properties of UCXBs Although the general trend in the stability behaviour of UCXBs is consistent with the prediction of the disc instability model, in a few cases the inconsistency of theoretical predictions with the system observed properties is weak enough to be attributed to observational and/or theoretical uncertainties. Two systems might require the presence of some amount of hydrogen in the donor star.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: low-mass, brown dwarfs - X-rays: binaries - stars: white dwarfs - stars: evolution

Simbad objects: 12

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Number of rows : 12

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* BW Ant LXB 09 29 20.19 -31 23 03.2   18.50 18.63     ~ 168 0
2 V* QU TrA LXB 15 47 54.6 -62 34 06           ~ 126 0
3 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 521 1
4 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 225 0
5 SWIFT J1756.9-2508 LXB 17 56 57.35 -25 06 27.8           ~ 89 0
6 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 194 0
7 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 891 1
8 NGC 6712 GlC 18 53 04.32 -08 42 21.5   9.85 8.69     ~ 458 0
9 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 228 1
10 4U 1857+01 LXB 19 08 26.97 +00 10 07.7 20.50 21.00 20.5     ~ 123 0
11 V* V1405 Aql LXB 19 18 47.871 -05 14 17.09 20.90 21.40 21.0     ~ 433 0
12 CXOU J212958.1+121002 XB* 21 29 58.06 +12 10 02.6     16.6     ~ 60 1

    Equat.    Gal    SGal    Ecl

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2019.11.14-21:14:01

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