The long term temporal behavior of two high mass X-ray binaries in the LMC observed with ROSAT.

Astronomy and Astrophysics – Astrophysics

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X-Ray Binaries: Magellanic Clouds, X-Ray Binaries: X-Ray Light Curves, X-Ray Binaries: Be Stars

Scientific paper

The high mass X-ray binaries EXO 053109-6609.2 and RX J0532.5-6551 lie in a region in the Large Magellanic Cloud which was covered by 40 pointed ROSAT PSPC observations. The majority of the observations originate from a monitoring program of the nearby sources LMC X-4 and AB Dor. The authors present long term soft X-ray light curves of EXO 053109-6609.2, a Be/X-ray transient discovered by EXOSAT and RX J0532.5-6551, discovered in the ROSAT all-sky survey. EXO 053109-6609.2 was found in outburst lasting for more than two months in March to May 1993 with count rates up to 0.5 cts s-1. RX J0532.5-6551 exhibited a strongly variable X-ray flux between the detection limit and 0.05 cts s-1 during survey and similarly between pointed observations. The brightest optical object in the error box of RX J0532.5-6551 is Sk -65°66, cataloged as OB star in the LMC, suggesting a supergiant high mass X-ray binary system.

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