Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125...83m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 1, Aug. 1983, p. 83-92. Research supported by the National Research C
Astronomy and Astrophysics
Astrophysics
46
O Stars, Star Clusters, Stellar Spectra, Supermassive Stars, Wolf-Rayet Stars, Brightness Distribution, Cores, Hydrogen Clouds, Mass To Light Ratios, Visible Spectrum
Scientific paper
High signal-to-noise optical spectroscopy exhibits the type WN 6 + O 3-4 for the central 2arcsec.5×5arcsec of R 136 = HD 38268, the diffuse, luminous core object of the very young cluster NGC 2070 in the giant 30 Doradus nebula in the Large Magellanic Cloud. The published UV spectrum in the central 3arcsec diameter can also be synthesized by the superposition of the spectrum of one or more WN stars with several O 3 stars. Lower S/N optical spectra in two 2arcsec.5×5arcsec regions offset 2arcsec.5 to the north and to the south of the centre of R 136, respectively, show that (1) most of the light in R 136 is stellar, (2) the broad emission from the WN 6 component peaks in strength in the central region, and (3) photospheric absorption lines from hot stars are seen with the same strength throughout R 136. The best overall interpretation of R 136 is that it represents the dense stellar core of a populous cluster.
Moffat Anthony F. J.
Seggewiss Wilhelm
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