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Astron. Astrophys. 355, 1053-1059 (2000)

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The pulse shape and spectrum of the millisecond pulsar PSR J0218+4232 in the energy band 1-10 keV observed with BeppoSAX

T. Mineo 1, G. Cusumano 1, L. Kuiper 2, W. Hermsen 2, E. Massaro 3, W. Becker 4, L. Nicastro 1, B. Sacco 1, F. Verbunt 5, A.G. Lyne 6, I.H. Stairs 6 and S. Shibata 7

1 Istituto di Fisica Cosmica ed Applicazioni all'Informatica CNR, Via U. La Malfa 153, 90146, Palermo, Italy
2 SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
3 Istituto Astronomico, Unita' GIFCO Roma-1, Universita' "La Sapienza", Via Lancisi 29, 00161 Roma, Italy
4 Max-Planck-Institut für Extraterrestrische Physik, 85740 Garching bei München, Germany
5 Astronomical Institute Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands
6 University of Manchester, Jodrell Bank, Macclesfield SK11 9DL, UK
7 Department of Physics, Yamagata University, Kojirakawa, Yamagata 990-8560, Japan

Received 5 November 1999 / Accepted 21 January 2000


We present the results of a BeppoSAX observation of PSR J0218+4232 which, for the first time, provides detailed information on the pulsar's temporal and spectral emission properties in the broad band 1-10 keV. We detected X-ray pulses with a pulsed fraction of 73[FORMULA]12%. The pulse profile is characterized by two peaks phase separated by [FORMULA]. The pulsed spectrum is best described by a power-law of photon index 0.61[FORMULA]0.32 with an unabsorbed (2-10 keV) X-ray flux of 4.1[FORMULA]10-13 erg cm-2 s-1 implying a luminosity of [FORMULA] erg s-1 and an X-ray efficiency of [FORMULA] where [FORMULA] is the solid angle spanned by the emission beam.

Key words: stars: neutron – stars: pulsars: individual: PSR J0218+4232 – X-rays: stars

Send offprint requests to: T. Mineo (mineo@ifcai.pa.cnr.it)

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© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000