We model the emission lines generated in the photoionized debris of a tidally disrupted horizontal branch (HB) star. We find that at late times, the brightest optical emission lines are [Nii] λλ6548, 6583 and [Oiii] λλ4959, 5007. Models of a red clump HB star undergoing mild disruption by a massive (50-100 M⊙) black hole (BH) 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 ultraviolet emission-line spectrum that can verify the tidal disruption scenario and constrain the mass of the BH.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science