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The optical counterpart to the X-ray transient IGR J18245-2452 in the globular cluster M28

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arxiv 1306.6416 v1 pith:G2T3Z5G3 submitted 2013-06-27 astro-ph.SR astro-ph.HE

The optical counterpart to the X-ray transient IGR J18245-2452 in the globular cluster M28

C. Pallanca (1) , E. Dalessandro (1) , F. R. Ferraro (1) , B. Lanzoni (1) , G. Beccari (2) - (1 Dipartimento di Fisica e Astronomia , Universit\`a degli Studi di Bologna , 2 ESO , Garching) This is my paper
classification astro-ph.SR astro-ph.HE
keywords stardetectedstatetransientclustercounterpartduringglobular
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We report on the identification of the optical counterpart to the recently detected INTEGRAL transient IGR J18245-2452 in the Galactic globular cluster M28. From the analysis of a multi epoch HST dataset we have identified a strongly variable star positionally coincident with the radio and Chandra X-ray sources associated to the INTEGRAL transient. The star has been detected during both a quiescent and an outburst state. In the former case it appears as a faint, unperturbed main sequence star, while in the latter state it is about two magnitudes brighter and slightly bluer than main sequence stars. We also detected Halpha excess during the outburst state, suggestive of active accretion processes by the neutron star.

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