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Published October 2016 | Version Published
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EXO 2030+375 Restarts in Reverse

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Abstract

The Be X-ray binary pulsar EXO 2030+375, first detected in 1985, has shown a significant detected 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 transition 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.

Additional Information

Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. We thank the Swift, NuSTAR, and NOT teams for scheduling the requested observations, sometimes on short notice.

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Identifiers

Eprint ID
89222
Resolver ID
CaltechAUTHORS:20180828-122923745

Dates

Created
2018-08-28
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Updated
2021-11-16
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Caltech Custom Metadata

Caltech groups
Space Radiation Laboratory, NuSTAR
Series Name
Proceedings of Science
Series Volume or Issue Number
285