EXO 2030+375 Restarts in Reverse

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https://pos.sissa.it/285/076

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https://doi.org/10.22323/1.285.0076
 http://hdl.handle.net/11603/29549

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

Date

2017-08-23

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conference papers and proceedings
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Citation of Original Publication

Kretschmar, Peter, Felix Fuerst, Colleen A. Wilson-Hodge, Pere Blay, Jari Kajava, Julia Alfonso-Garzón, Matthias Kühnel, et al. “EXO 2030+375 Restarts in Reverse.” In Proceedings of 11th INTEGRAL Conference Gamma-Ray Astrophysics in Multi-Wavelength Perspective — PoS(INTEGRAL2016), 285:076. SISSA Medialab, 2017. https://doi.org/10.22323/1.285.0076.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The Be X-ray binary pulsar EXO 2030+375, first detected in 1985, has shown a significant de- tected X-ray outburst at nearly every periastron passage of its 46-day orbit for the past 25 years, with one low state accompanied by a torque reversal in the 1990s. In early 2015 the outbursts progressively became fainter and less regular while the monotonic spin-up flattened. At the same time a decrease in the Hα line equivalent width was reported, indicating a change in the disk surrounding the mass donor. In order to explore the source behaviour in the poorly explored low-flux state with a possible tran- sition to a state of centrifugal inhibition of accretion we have undertaken an observing campaign with Swift/XRT, NuSTAR and the Nordic Optical Telescope (NOT). This conference contribution reports the preliminary results obtained from our campaign.