Other
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sciam.251...52m&link_type=abstract
Scientific American (ISSN 0036-8733), vol. 251, Aug. 1984, p. 52-60.
Other
Magellanic Clouds, Nebulae, Radiation Sources, Supermassive Stars, Cosmic Dust, Interferometry, Stellar Evolution, Stellar Mass, Ultraviolet Spectra
Scientific paper
The superluminous object R136a of the nebula 30 Dor in the Large Cloud of Magellan is characterized, summarizing the results of recent optical and (IUE) UV observations. Photographs, spectra, and diagrams are provided; and the techniques used to determine the parameters of the object are explained. The UV spectra exhibit a typical P Cygni profile like that of O-type stars, but R136a is much brighter (5 x 10 to the 7th solar luminosity). Speckle interferometry has identified a main component and two fainter objects at distances of 0.5 and 0.1 arcsec. The main component R136a1 is probably either a very massive single star (400-1000 solar mass) or a tight cluster of stars of known types. Evidence for the existence of other similar objects is reviewed.
Cassinelli Joe P.
Mathis John S.
Savage Blair. D.
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