Variability of X-ray pulsars in a hard energy band observed with INTEGRAL

2); 5); 5) (1 - IKI; A.Lutovinov (1); Garching; Germany; 3 - ISDC; I.Bikmaev (4; Kazan; M.Chernyakova (3); Moscow

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Variability of X-ray pulsars in a hard energy band observed with INTEGRAL

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arxiv astro-ph/0407350 v1 submitted 2004-07-16 astro-ph

A.Lutovinov (1) , S.Tsygankov (1) , M.Revnivtsev (1 , 2) , M.Chernyakova (3) , I.Bikmaev (4 , 5) , S.Molkov (1)

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R.Burenin (1) N.Sakhibullin (4 5) (1 - IKI Moscow Russia; 2 - MPA Garching Germany; 3 - ISDC Versoix Switzerland; 4 - KGU Kazan Russia; 5 - AST Russia)

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keywords x-rayintegralexo1722-363hardinvestigatedorbitalperiodpulsars

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abstract

We present the first results of the observations of the X-ray pulsars LMC X-4, 4U0352+309 and EXO1722-363 performed with the INTEGRAL observatory. The LMC X-4 was investigated during the whole superorbital cycle ($\sim$30 days) and it was found that its period was not stable at this time scale. We detected a variable X-ray flux (18-60 keV) from the pulsar EXO1722-363, which could be connected with the orbital motion in the binary system. A more accurate position and the estimate of the orbital period for this source are reported. We also investigated a hard X-ray spectrum of 4U0352+309 (X Persei) measured with INTEGRAL and report the detection of the cyclotron absorption line at about 29 keV.

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