2009A&A...503..889K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST17:23:56

2009A&A...503..889K - Astronomy and Astrophysics, volume 503, 889-897 (2009/9-1)

Restless quiescence: thermonuclear flashes between transient X-ray outbursts.

KUULKERS E., IN'T ZAND J.J.M. and LASOTA J.-P.

Abstract (from CDS):

For thermonuclear flashes to occur on neutron-star surfaces, fuel must have been accreted from a donor star. However, sometimes flashes are seen from transient binary systems when they are thought to be in their quiescent phase, during which no accretion, or relatively little, is expected to occur. We investigate the accretion luminosity during several such flashes, including the first-ever and brightest detected flash from Cen X-4 in 1969. We infer from observations and theory that immediately prior to these flashes the accretion rate must have been between about 0.001 and 0.01 times the equivalent of the Eddington limit, which is roughly 2 orders of magnitude less than the peak accretion rates seen in these transients during an X-ray outburst and 3-4 orders of magnitude more than the lowest measured values in quiescence. Furthermore, three such flashes, including the one from Cen X-4, occurred within 2 to 7 days followed by an X-ray outburst. A long-term episode of enhanced, but low-level, accretion is predicted near the end of the quiescent phase by the disk-instability model, and may thus have provided the right conditions for these flashes to occur. We discuss the possibility of whether these flashes acted as triggers of the outbursts, signifying a dramatic increase in the accretion rate. Although it is difficult to rule out, we find it unlikely that the irradiance by these flashes is sufficient to change the state of the accretion disk in such a dramatic way.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - binaries: close - binaries: general - stars: neutron - X-rays: binaries - X-rays: bursts

Simbad objects: 21

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Number of rows : 21

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* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4808 1
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5598 4
3 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4001 3
4 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 506 0
5 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 828 1
6 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1525 0
7 MXB 1658-298 LXB 17 02 06.54 -29 56 44.1 18.35 18.75 18.3     ~ 324 0
8 4U 1711-34 LXB 17 14 19.78 -34 02 47.3           ~ 42 0
9 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 393 0
10 2XMM J174716.1-281047 LXB 17 47 16.17 -28 10 48.2           ~ 45 0
11 [KRL2007b] 277 LXB 17 47 18.06 -27 20 38.9           ~ 70 0
12 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 346 0
13 ESO 455-49 GlC 17 50 46.40 -31 16 31.0           ~ 153 0
14 Granat 1747-312 LXB 17 50 46.862 -31 16 28.86           ~ 99 1
15 [KRL2007b] 294 LXB 17 54 14.60 -27 54 34.3           ~ 27 0
16 2S 1803-245 LXB 18 06 50.72 -24 35 28.6           ~ 70 0
17 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 871 0
18 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 662 0
19 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 288 0
20 4U 1857+01 LXB 19 08 26.97 +00 10 07.7 20.50 21.00 20.5     ~ 123 0
21 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1011 1

    Equat.    Gal    SGal    Ecl

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2020.07.16-17:23:56

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