2010A&A...513A..71S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST21:05:49

2010A&A...513A..71S - Astronomy and Astrophysics, volume 513, A71-71 (2010/4-1)

Echo outbursts in KS 1731-260.

SIMON V.

Abstract (from CDS):

The thermal-viscous instability of the accretion disk is thought to play an important role in the activity of low-mass X-ray binaries (LMXBs). It should also appear when a (quasi)persistent LMXB goes into its low state. We analyze the long-term X-ray activity of the neutron star LMXB KS 1731-260 during a part of its long main outburst and a complicated transition back to the low state (quiescence). We pay special attention to the variations during the state transition. We make use of the ASM/RXTE observations for a timeseries analysis of the longterm variations and investigation of the X-ray color changes in the 1.5-12keV passband. In our interpretation, the mass transfer rate {dot}(m)tr between the donor and neutron star significantly increased during the main outburst of KS 1731-260, which prolonged this event by keeping the disk ionized to its outer rim. Later on, a considerable fraction of the outer part of the disk was rapidly brought out of steady-state when {dot}(m)tr decreased again. Only a slow decrease of {dot}(m)tr continued even after the end of the main outburst. This lead to the formation of the central disk region, which was kept thermally stable, ionized by irradiation, and was surrounded by the outer, thermally unstable disk region. This configuration triggered the series of the echo outbursts. These outbursts are outside-in, caused by the still continuing {dot}(m)tr via the mass stream impinging the outer rim of the disk without overflow. We argue that introducing any strong bursts of matter from the donor to the disk as the cause of the echo outbursts is superfluous. The spectral evolution suggests that the disk returns to steady-state during the maxima of the echo outbursts. The X-ray emission between the echo outbursts is much higher than in the true quiescence and can be due to the ongoing {dot}(m)tr. We place the peculiar long-term activity of KS 1731-260 in the context of the systems with the echo outbursts, both soft X-ray transients and dwarf novae.

Abstract Copyright:

Journal keyword(s): stars: neutron - accretion, accretion disks - novae, cataclysmic variables - circumstellar matter - X-rays: binaries - stars: individual: KS 1731-260

Simbad objects: 32

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Number of rows : 32

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* V518 Per HXB 04 21 42.7231318463 +32 54 26.936934166 13.00 13.50 13.2     M4.5V 620 1
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5596 4
3 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 570 0
4 V* EZ Lyn DN* 08 04 34.2191501584 +51 03 49.367636054   17.1   17.4   ~ 53 0
5 V* SU UMa DN* 08 12 28.2694633475 +62 36 22.428029272           B2 469 0
6 V* EG Cnc DN* 08 43 03.9868348725 +27 51 49.696061650   11.9       DAe 157 0
7 V* V406 Hya CV* 09 05 54.7498123851 -05 36 08.482127031   19.8 16.5 19.1   ~ 49 0
8 V* MM Vel HXB 10 13 36.4107940553 -45 04 32.555813596   14.84 14.71     G5V-M0V 183 0
9 V* V803 Cen CV* 13 23 44.5334901172 -41 44 29.260966080   16.8 14.42     ~ 138 0
10 V* UZ Boo DN* 14 44 01.2110601160 +22 00 54.790288273   14.114       ~ 69 1
11 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 506 0
12 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1022 0
13 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 827 1
14 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 786 1
15 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1701 1
16 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1920 0
17 RX J1709.5-2639 LXB 17 09 34 -26 39.9           ~ 105 0
18 1H 1715-321 LXB 17 18 47.40 -32 10 40.0           ~ 73 0
19 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 377 2
20 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 393 0
21 1RXS J173546.9-302859 LXB 17 35 46.88 -30 29 00.4           ~ 66 1
22 2EG J1746-2852 LXB 17 44 33.09 -28 44 27.0           ~ 484 0
23 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11542 0
24 [KRL2007b] 304 LXB 18 06 59.8 -29 24 30           ~ 197 0
25 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 870 0
26 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 386 1
27 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 900 1
28 V* V406 Vul HXB 18 58 41.580 +22 39 29.40 15.00 15.65 15.31     G5V-K0V 316 0
29 4U 1857+01 LXB 19 08 26.97 +00 10 07.7 20.50 21.00 20.5     ~ 123 0
30 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1011 1
31 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 888 0
32 V* V1727 Cyg LXB 21 31 26.2132551598 +47 17 24.514506031 16.75 17.05 16.4     ~ 231 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-21:05:49

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