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Luminous [O III] and [N II] from Tidally Disrupted Horizontal Branch Stars

We model the emission lines generated in the photoionised debris of a tidally disrupted horizontal branch star. We find that at late times, the brightest optical emission lines are [N II] λλ6548,6583 and [O III] λλ4959,5007. Models of a red clump horizontal branch star undergoing mild disruption by a massive (50 -- 100 M_\sun) black hole yield an emission line spectrum that is in good agreement with that observed in the NGC 1399 globular cluster hosting the ultraluminous X-ray source CXOJ033831.8 - 352604. We make predictions for the UV emission line spectrum that can verify the tidal disruption scenario and constrain the mass of the BH.

preprint2012arXivOpen access
Drew ClausenSteinn SigurdssonMichael EracleousJimmy A. Irwin
astro-ph.HEastro-ph.SR
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Drew ClausenSteinn SigurdssonMichael EracleousJimmy A. Irwin

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