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| Paper: |
The Be Disk Structure in A 0535+262/V725 Tau
During the X-Ray Giant Outburst |
| Volume: |
464, Circumstellar Dynamics at High Resolution |
| Page: |
285 |
| Authors: |
Moritani, Y.; Nogami, D.; Okazaki, A. T.; Imada, A.; Kambe, E.; Honda, S.; Hashimoto, O.; Ichikawa, K. |
| Abstract: |
The famous Be/X-ray binary A 0535+262/V725 Tau stayed in outburst phase from
2008 to 2011, emitting several X-ray outbursts including the two giant
outbursts in November/December 2009 and February 2011. We carried out a
high-dispersion spectroscopic monitoring of A 0535+262, aiming at the Be
disk structure in outburst phase, in particular during outbursts. Our
observations could cover the 2009 giant outburst. Observed emission line
profiles, reflecting the Be disk structure, showed drastic variabilities.
Blue “shoulder” feature in Hα line profile after the periastrons
indicates the dense gas stream from the outer part of the Be disk to the
neutron star. Other features such as the redshifted enhanced component, the
high equivalent width value and the departure from the V/R variabilities
suggest that the Be disk had tidally warped component in recent years. We
analyzed the radial velocity of the enhanced component and found that the
giant outbursts were likely caused by enormous mass transfer from the warped
Be disk to the neutron star. |
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