2008A&A...492..135S


Query : 2008A&A...492..135S

2008A&A...492..135S - Astronomy and Astrophysics, volume 492, 135-143 (2008/12-2)

A group of outbursts with exponential decays in the Rapid Burster.

SIMON V.

Abstract (from CDS):

We present an analysis focused on a specific group of six intense outbursts (abbreviated as group A) that displays strong persistent emission in the unique low-mass X-ray binary Rapid Burster (MXB 1730-335). Observations taken from ASM/RXTE in the 1.5-12keV passband were utilized. We interpret the exponential decay of these outbursts as arising from irradiation of the disk by X-rays strong enough to ionize all of the disk out to its outer edge without self-shadowing, using earlier models. The parameters of irradiation apparently remained stable with a relatively high degree of consistency for all six events of group A, but they underwent a large and rapid change in twelve outbursts of the subsequent set (group B). We argue that this was because of a change in the conditions for the disk irradiation. We interpret the irradiation in terms of the slim accretion disk region. We find that the vertical dimension of the irradiating source, hence its ability to irradiate the disk, decreases with the increasing luminosity of the outbursts with exponential decays in neutron-star, soft X-ray transients of a comparable orbital period length, and is exceptionally small in the Rapid Burster. The group A outburst profiles indicate that the Rapid Burster is an ultra-compact system. The difference between the intensities and profiles of the group A and group B outbursts is not caused by a different absorption and the irradiating source remains the same for both groups. Fluctuations in the outburst profile display striking regularities, not only inside each group, but also between both groups. We interpret them as due to the spiral arms reaching the disk center. The very rapid rise of outbursts in both groups speaks in favor of a small radius for the optically thin, advection-dominated flow prior to an outside-in outburst. We argue in favor of a relatively weak magnetic field of the neutron star in this system and against a significant role for the propeller effect.

Abstract Copyright:

Journal keyword(s): stars: neutron - accretion, accretion disks - binaries: close - circumstellar matter - X-rays: binaries - stars: individual: Rapid Burster

Simbad objects: 15

goto Full paper

goto View the references in ADS

Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5106 0
2 M 1 SNR 05 34 32 +22 00.8           ~ 6006 1
3 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 605 0
4 V* V822 Cen LXB 14 58 21.9347842080 -31 40 07.515432768 11.95 12.85 12.8     K3-K7V 535 0
5 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 886 1
6 RX J1709.5-2639 LXB 17 09 34 -26 39.9           ~ 117 0
7 Liller 1 Cl* 17 33 24.50 -33 23 20.0           ~ 242 0
8 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 402 2
9 3FHL J1746.2-2852 LXB 17 44 33.09 -28 44 27.0           ~ 517 0
10 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 242 0
11 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 214 0
12 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 948 0
13 4U 1857+01 LXB 19 08 26.97 +00 10 07.7 20.50 21.00 20.5     ~ 127 0
14 X Aql X-1 LXB 19 11 16.0571313336 +00 35 05.868232692           ~ 1095 1
15 V* V1727 Cyg LXB 21 31 26.2133156448 +47 17 24.512055396 16.75 17.05 16.4     ~ 237 0

To bookmark this query, right click on this link: simbad:objects in 2008A&A...492..135S and select 'bookmark this link' or equivalent in the popup menu


2023.02.09-09:30:56

© Université de Strasbourg/CNRS

    • Contact