Photometric Periodicities of Be/X-ray Pulsars in the Small Magellanic Cloud
نویسنده
چکیده
Analysis of the longterm photometric variability of 7 Be/X-ray-pulsar systems in the Small Magellanic Cloud has been carried out. We find a variety of types of variability are present, including: longterm irregular changes, periodic orbital outbursts due to interaction between the stars (weeks to months), low-amplitude quasi-periodic variations of the equatorial disk (days), and nonradial pulsations of the Be primary star (hours). This is the first time nonradial pulsations have been identified in Be/X-ray binaries, although they were previously known in some single Be stars. Subject headings: X-rays: binaries – stars: Be – (stars:) pulsars – stars: variable – stars: individual: XMMU J004723.7−731226, RX J0049.1−7250, XTE J0052−725, RX J0050.7−7316, CXOU J005455.6−724510, RX J0054.9−7226, XMMU J005517.9−723853
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