4U 0115+63: A Bonanza of Cyclotron Resonance Scattering Features

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Mueller_TopicB.pdf (1.46 MB)

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https://www.cosmos.esa.int/documents/332006/954765/Mueller_TopicB.pdf

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http://hdl.handle.net/11603/29804

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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UMBC Physics Department

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https://orcid.org/0000-0002-4656-6881

Date

2011

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posters
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Abstract

We report on an outburst of the high mass X-ray binary 4U 0115+634 with a pulse period of 3.6 s in 2008 as observed with INTEGRAL and RXTE. By analysing the lightcurves we derived an updated orbital period of the binary system. We also studied the pulse profile variations as a function of time and energy. We find evidence for phase lags at ∼11 and ∼22 keV. In our spectral analysis we found clear evidence for at least two cyclotron features. The continuum can be described by two different models, which lead to a fundamental difference in the behavior of the cyclotron features. We discuss possible reasons for this disagreement.