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Strong [O iii ] and [N ii ] emission lines in globular clusters from photoionized R Corona Borealis star winds

2010; Oxford University Press; Volume: 410; Issue: 1 Linguagem: Inglês

10.1111/j.1745-3933.2010.00973.x

1745-3933

Thomas J. Maccarone, Brian D. Warner,

Gamma-ray bursts and supernovae

Abstract The globular cluster X-ray source CXO J033831.8–352604 in NGC 1399 has recently been found to show strong emission lines of [O iii] and [N ii] in its optical spectrum in addition to ultraluminous X-ray emission with a soft X-ray spectrum. It was further suggested that this system contained an intermediate-mass black hole which had tidally disrupted a white dwarf, producing the strong emission lines without detectable hydrogen emission. We show that an alternative exists which can explain the data more naturally in which the oxygen- and nitrogen-rich material is ejected from an R Corona Borealis (RCB) star. The scenario we propose here does not require an intermediate-mass black hole as the accretor, but also does not exclude the possibility.