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

Abstract

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.

8 pages, 6 figures, Accepted for publication in MNRAS

References in corpus (5)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Black Hole Spin Evolution: Implications for Short-hard Gamma Ray Bursts and Gravitational Wave Detection
• Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
• Very Broad [O III]4959,5007 Emission from the NGC 4472 Globular Cluster RZ2109 and Implications for the Mass of Its Black Hole X-ray Source
• GALEX Ultraviolet Photometry of Globular Clusters in M31: Three Year Results and a Catalog

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• X-Ray Spectral Variability of Ultraluminous X-Ray Sources in Extragalactic Globular Clusters
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• Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole
• Hubble Space Telescope Snapshot Search for Planetary Nebulae in Globular Clusters of the Local Group
• Slow Decline and Rise of the Broad [OIII] Emission Line in Globular Cluster Black Hole Candidate RZ2109
• An Extreme Ultra-Compact X-ray Binary in a Globular Cluster: Multi-Wavelength Observations of RZ2109 Explored in a Triple System Framework
• An Arena for Multi-Messenger Astrophysics: Inspiral and Tidal Disruption of White Dwarfs by Massive Black Holes