J/A+A/556/A139 Spectrum of SXP1062 (Sturm+, 2013)
Long-term evolution of the neutron-star spin period of SXP1062.
Sturm R., Haberl F., Oskinova L.M., Schurch M.P.E., Henault-Brunet V.,
Gallagher J.S.III, Udalski A.
<Astron. Astrophys. 556, A139 (2013)>
=2013A&A...556A.139S 2013A&A...556A.139S
ADC_Keywords: Binaries, X-ray ; Spectroscopy ; Spectra, red
Keywords: pulsars: individual: SXP1062 -
galaxies: individual: Small Magellanic Cloud -
stars: emission-line, Be - stars: neutron - X-rays: binaries
Abstract:
The Be/X-ray binary SXP 1062 is of especial interest owing to the
large spin period of the neutron star, its large spin-down rate, and
the association with a supernova remnant constraining its age. This
makes the source an important probe for accretion physics.
To investigate the long-term evolution of the spin period and
associated spectral variations, we performed an XMM-Newton
target-of-opportunity observation of SXP 1062 during X-ray outburst.
Spectral and timing analysis of the XMM-Newton data was compared with
previous studies, as well as complementary Swift/XRT monitoring and
optical spectroscopy with the SALT telescope were obtained.
The spin period was measured to be Ps=(1071.01±0.16)s on 2012 Oct
14. The X-ray spectrum is similar to that of previous observations. No
convincing cyclotron absorption features, which could be indicative
for a high magnetic field strength, are found. The high-resolution RGS
spectra indicate the presence of emission lines, which may not
completely be accounted for by the SNR emission. The comparison of
multi-epoch optical spectra suggest an increasing size or density of
the decretion disc around the Be star.
SXP 1062 showed a net spin-down with an average of
dPs/dt=(2.27±0.44)s/yr over a baseline of 915 days.
Description:
The spectra of SXP1062 were taken 2012-10-13 using the RSS
spectrograph on the Southern African Large Telescope (SALT). They
cover the approximate wavelength range 3800-5000Å and
6050-6950Å. The spectra have been redshift corrected for 150km/s
and then normalised.
Objects:
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RA (2000) DE Designation(s)
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01 27 45.95 -73 32 56.3 SXP1062 = CXOU J012745.9-733256
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
salt_red.dat 30 3014 *Normalised red spectrum of SXP1062
salt_blu.dat 30 3221 *Normalised blue spectrum of SXP1062
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Note on salt_*.dat: All spectra have been redshift corrected based on 150km/s
and normalised.
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See also:
J/MNRAS/353/601 : 2dF survey of the Small Magellanic Cloud (Evans+, 2004)
Byte-by-byte Description of file: salt_*.dat
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Bytes Format Units Label Explanations
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5- 15 F11.6 0.1nm lambda [3818/6957] Wavelength in Å
(redshift corrected)
23- 30 F8.6 --- Flux Normalised flux
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Acknowledgement:
Richard Sturm, <rsturm( at )mpe.mpg.de>,
Max Planck Institute for Extraterrestrial Physics
References:
Henault-Brunet, 2012MNRAS.420L..13H 2012MNRAS.420L..13H, Discovery of a Be/X-ray pulsar binary
and associated supernova remnant in the Wing of the Small Magellanic Cloud
Haberl, 2012A&A...537L...1H 2012A&A...537L...1H, SXP 1062, a young Be X-ray binary pulsar with
long spin period. Implications for the neutron star birth spin
(End) Richard Sturm [MPE] 18-Jul-2013