C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET21:21:55

2009A&A...498..217M - Astronomy and Astrophysics, volume 498, 217-222 (2009/4-4)

Pulsed thermal emission from the accreting pulsar XMMU J054134.7-682550.


Abstract (from CDS):

Soft X-ray excesses have been detected in several Be/X-ray binaries and interpreted as the signature of hard X-ray reprocessing in the inner accretion disk. The system XMMU J054134.7-682550, located in the LMC, featured a giant Type II outburst in August 2007. The geometry of this system can be understood by studying the response of the soft excess emission to the hard X-ray pulses. We have analyzed series of simultaneous observations obtained with XMM-Newton/EPIC-MOS and RXTE/PCA in order to derive spectral and temporal characteristics of the system, before, during and after the giant outburst. Spectral fits were performed and a timing analysis has been carried out. Spectral variability, spin period evolution and energy dependent pulse shapes are analysed. The outburst (LX=3x1038erg/s≃LEDD) spectrum could be modeled successfully using a cutoff powerlaw, a cold disk emission, a hot blackbody, and a cyclotron absorption line. The magnetic field and magnetospheric radius could be constrained. The thickness of the inner accretion disk is broadened to a width of 75km. The hot blackbody component features sinusoidal modulations indicating that the bulk of the hard X-ray emission is emitted preferentially along the magnetic equator. The spin period of the pulsar decreased very significantly during the outburst. This is consistent with a variety of neutron star equations of state and indicates a very high accretion rate.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: emission-line, Be - accretion, accretion disks - Magelanic Clouds

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 917 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15214 1
3 UCAC2 2073373 HXB 05 41 34.3044817531 -68 25 48.449467067   14.03 14.01 14.12 13.83 B0-B1IIIe 25 1

    Equat.    Gal    SGal    Ecl

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