4.7 Article

Outbursts large and small from EXO 2030+375

Journal

ASTROPHYSICAL JOURNAL
Volume 678, Issue 2, Pages 1263-1272

Publisher

IOP PUBLISHING LTD
DOI: 10.1086/587134

Keywords

accretion, accretion disks; pulsars : individual (EXO 2030+375); X-rays : binaries

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During the summer of 2006, the accreting X-ray pulsar EXO 2030+375 underwent its first giant outburst since its discovery in 1985. Our observations include the first ever of the rise of a giant outburst of EXO 2030+375. EXO 2030+375 was monitored daily with the Rossi X-Ray Timing Explorer (RXTE) from 2006 June to 2007 May. During the giant outburst we discovered evidence for a cyclotron feature at similar to 11 keV. This feature was confidently detected for about 90 days, during the brighter portion of the outburst. Daily observations of the next five EXO 2030+375 orbits detected pulsations at all orbital phases and normal outbursts shifted to a later orbital phase than before the giant outburst. An accretion disk appears to be present in both the normal and giant outbursts, suggesting that the long-term behavior is a product of the state of the Be star disk and the accretion disk. Here we will present flux and frequency histories from our detailed RXTE observations of the giant outburst and the normal outbursts that surrounded it. A new orbital analysis is presented that includes observations from 1991 to 2007 August.

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