2007A&A...464.1069F


Query : 2007A&A...464.1069F

2007A&A...464.1069F - Astronomy and Astrophysics, volume 464, 1069-1074 (2007/3-4)

Simultaneous INTEGRAL and RXTE observations of the accreting millisecond pulsar HETE J1900.1-2455.

FALANGA M., POUTANEN J., BONNING E.W., KUIPER L., BONNET-BIDAUD J.M., GOLDWURM A., HERMSEN W. and STELLA L.

Abstract (from CDS):

HETE J1900.1-2455 is the seventh known X-ray transient accreting millisecond pulsar and has been in outburst for more than one year. We compared the data on HETE J1900.1-2455 with other similar objects and made an attempt at deriving constraints on the physical processes responsible for a spectral formation. The broad-band spectrum of the persistent emission in the 2-300keV energy band and the timing properties were studied using simultaneous INTEGRAL and publicly available RXTE data obtained in October 2005. The properties of the X-ray bursts observed from HETE J1900.1-2455 were also investigated. The spectrum is well described by a two-component model consisting of a blackbody-like soft X-ray emission at 0.8 keV temperature and a thermal Comptonized spectrum with electron temperature of 30 keV and Thomson optical depth τT∼2 for the slab geometry. The source is detected by INTEGRAL up to 200keV at a luminosity of 5x1036erg/s (assuming a distance of 5kpc) in the 0.1-200keV energy band. We have also detected one type I X-ray burst which shows photospheric radius expansion. The burst occurred at an inferred persistent emission level of ∼3-4% of the Eddington luminosity. Using data for all X-ray bursts observed to date from HETE J1900.1-2455, the burst recurrence time is estimated to be about 2 days. No pulsations have been detected either in the RXTE or in the INTEGRAL data which puts interesting constraints on theories of magnetic field evolution in neutron star low-mass X-ray binaries.

Abstract Copyright:

Journal keyword(s): stars: pulsars: individual: HETE J1900.1-2455 - stars: neutron - X-rays: binaries - X-rays: bursts

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 265 1
2 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 245 0
3 2MAXI J1900-248 LXB 19 00 08.65 -24 55 13.7     18.09     ~ 209 0

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