EXO 2030+375 Restarts in Reverse
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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.
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.