Issue |
A&A
Volume 436, Number 2, June III 2005
|
|
---|---|---|
Page(s) | L31 - L34 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200500117 | |
Published online | 30 May 2005 |
Letter to the Editor
INTEGRAL high energy observations of 2S 0114+65
1
LUTh, Observatoire de Paris, 92195 Meudon Cedex, France e-mail: erin.bonning@obspm.fr
2
CEA Saclay, DSM/DAPNIA/Service d'Astrophysique (CNRS FRE 2591), 91191 Gif-sur-Yvette, France
Received:
11
March
2005
Accepted:
28
April
2005
We report the first INTEGRAL timing and spectral analysis of the high
mass X-ray binary source 2S 0114+65 at high energies (5–100 keV). The pulse
period was found at 2.668 h with a high pulsed fraction, ~80%
in both the 20–40 keV and 40–80 keV energy bands. The spin-up trend
over ~8 years was measured to be
10-7 s s-1. The hard X-ray spectrum obtained with JEM-X/ISGRI is well described by a high energy exponential
cut-off power law model where the estimated luminosity is 1.8
1036 erg s-1 in the 5–100 keV energy band, for a source distance of 7.2 kpc. We tentatively identify a cyclotron
resonance scattering feature at ~22 keV with one harmonic, implying a
magnetic field of ~2.5
1012 G.
Key words: pulsars: individual: 2S 0114+65 / stars: neutron / X-rays: stars
© ESO, 2005
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