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Issue A&A
Volume 392, Number 1, September II 2002
Page(s) 181 - 187
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020935



A&A 392, 181-187 (2002)
DOI: 10.1051/0004-6361:20020935

BeppoSAX observations of the three Gamma-ray pulsars PSR B0656+14, PSR B1055-52 and PSR B1706-44

T. Mineo1, E. Massaro2, 3, G. Cusumano1 and W. Becker4

1  Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR, Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
2  Dipartimento di Fisica, Universitá La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
3  Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR, Sezione di Roma, Via Fosso del Cavaliere, 00113 Roma, Italy
4  Max-Planck-Institut für Extraterrestrische Physik, 85740 Garching-bei-München, Germany

(Received 20 March (2002) / Accepted 4 June (2002))

Abstract
We report the results of the observations of the three $\gamma$-ray pulsars PSR B0656+14, PSR B1055-52 and PSR B1706-44 performed with BeppoSAX. We detected a pulsed emission only for PSR B1055-52: in the range 0.1-6.5 keV the pulse profile is sinusoidal and the statistical significance is $4.5 \sigma$. The pulsed fraction was estimated $0.64\pm 0.17$. This pulsation was detected also at energies greater than 2.5 keV suggesting either a non-thermal origin or a quite high temperature region on the neutron star surface. Spectral analysis showed that only the X-ray spectrum of PSR B1706-44 can be fitted by a single power-law component, while that of PSR B1055-52 requires also a blackbody component ( kT = 0.075 keV) and that of PSR B0656+14 two blackbody components ( kT1 = 0.059, kT2 = 0.12 keV).


Key words: stars: neutron -- stars: pulsars: general -- stars: pulsars: individual: PSR B0656+14, PSR B1055-52, PSR B1706 -44 -- X-rays: stars

Offprint request: T. Mineo, mineo@pa.iasf.cnr.it

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© ESO 2002


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