2004A&A...416..311W


Query : 2004A&A...416..311W

2004A&A...416..311W - Astronomy and Astrophysics, volume 416, 311-318 (2004/3-2)

X-ray spectral evolution of SAX J1747.0-2853 during outburst activity and confirmation of its transient nature.

WERNER N., IN'T ZAND J.J.M., NATALUCCI L., MARKWARDT C.B., CORNELISSE R., BAZZANO A., COCCHI M., HEISE J. and UBERTINI P.

Abstract (from CDS):

SAX J1747.0-2853 is an X-ray transient which exhibited X-ray outbursts yearly between 1998 and 2001, and most probably also in 1976. The outburst of 2000 was the longest and brightest. We have analyzed X-ray data sets that focus on the 2000 outburst and were obtained with BeppoSAX, XMM-Newton and RXTE. The data cover unabsorbed 2-10keV fluxes between 0.1 and 5.3x10–9erg/s/cm2. The equivalent luminosity range is 6x1035 to 2x1037erg/s. The 0.3-10keV spectrum is well described by a combination of a multi-temperature disk blackbody, a hot Comptonization component and a narrow Fe-K emission line at 6.5 to 6.8keV with an equivalent width of up to 285eV. The hydrogen column density in the line of sight is (8.8±0.5)x1022/cm2. The most conspicuous spectral changes in this model are represented by variations of the temperature and radius of the inner edge of the accretion disk, and a jump of the equivalent width of the Fe-K line in one observation. Furthermore, 45 type-I X-ray bursts were unambiguously detected between 1998 and 2001 which all occurred during or close to outbursts. We derive a distance of 7.5±1.3kpc which is consistent with previous determinations. Our failure to detect bursts for prolonged periods outside outbursts provides indirect evidence that the source returns to quiescence between outbursts and is a true transient.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - X-rays: bursts - X-rays: individual: SAX J1747.0-2853

Simbad objects: 2

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Number of rows : 2
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* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1974 0
2 [KRL2007b] 275 LXB 17 47 02.60 -28 52 58.9     14.20     ~ 172 0

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2023.02.02-19:05:45

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