INTEGRAL high energy observations of 2S 0114+65

Free access article

Issue		A&A Volume 436, Number 2, June III 2005


Page(s)		L31 - L34
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500117

A&A 436, L31-L34 (2005)
DOI: 10.1051/0004-6361:200500117

Letter

INTEGRAL high energy observations of 2S 0114+65

E. W. Bonning¹ and M. Falanga²

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 )

Abstract
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 $\dot P = -8.9$ $\times$ 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 $\times$ 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 $\times$ 10¹² G.

Key words: pulsars: individual: 2S 0114+65 -- stars: neutron -- X-rays: stars

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