AB Dor: A single star with RSCVn like activity in X-ray band |
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| Authors: | M Alev M A Alpar A Esendemir Ü Kiziloğlu |
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| Institution: | (1) Physics Department, Middle East Technical University, 06531 Ankara, Turkey |
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| Abstract: | Using the archival ROSAT PSPC observations, AB Dor is found to be variable in X-rays. The periodic variations are consistent with previously reported rotational period of 0
d
.514. The average spectrum of AB Dor is best represented with two-temperature Raymond-Smith model with kT values of 0.19±0.07 and 1.17±0.02 keV. The quiescent luminosity of the system is found to be 4.36±0.6×1030 ergs s–1. A flare with a rise time of  350 seconds is detected during which X-ray luminosity rises from 5.8±1.6×1030 to 15.8±4.9×1030 ergs s–1. We conclude that AB Dor is very similar to the active components of RS CVn binaries and other active classes. In view of the wide separation from the binary companion Rst 137B, this activity must be intrinsic to the active star. |
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| Keywords: | Stars: activity flare Binaries: visual X-rays: stars |
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