NASA NTRS · 19820023399
A search for UV line variability in R136a
Abstract
The brightest object in the central cluster of stars in the 30 Doradus nebula is R136a. Optical imaging and ultraviolet spectroscopy show that a luminosity originates in a volume less than 0.1 pc across. A very tight cluster of approximately 30 luminous O and WR stars produces this energy. An alternative interpretation is the possibility that a single supermassive object dominates the light. The visual spectrum is classified as WN 4.5. A common characteristic of WN spectra is variability of the emission lines, especially He II lambda 4686.
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Ebbets, D. C., Savage, B. B., Meade, M. R.. 1982-01-01. A search for UV line variability in R136a. https://ntrs.nasa.gov/citations/19820023399
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