The central object R 136 in the gas nebula 30 Doradus - Structure, color, mass and excitation parameter

Details The central object R 136 in the gas nebula 30 Doradus - Structure, color, mass and excitation parameter The central object R 136 in the gas nebula 30 Doradus - Structure, color, mass and excitation parameter

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84...50f&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 50-59. In German.

Astronomy and Astrophysics

Astrophysics

63

Astronomical Photography, Hydrogen Clouds, Magellanic Clouds, Nebulae, Astronomical Maps, Colorimetry, Gas Ionization, Isophotes, Mass

Scientific paper

Photographic observations with the 3,6 m ESO and 0,61 m Bochum telescopes in different colours of the central part of the 30 Doradus Nebula are presented. The structure of the central object R 136 is studied by image analysis methods, i.e. digitalisation and contrast enhancement. The central object R 136 of the supergiant gas nebula 30 Doradus consists of three components; the main component covers an area of (0.7 pc)2. The components show a colour gradient, R 136a being much bluer than R 136c. This composite structure is seen in photographic IR, U and V likewise. A plot of the spectral intensity distribution from λ = 73 cm to 1550 Å of the central 2'.5 × 2'.5 region of 30 Doradus is given. The main contribution in the UV can be attributed to R 136. This object dominates the of the central part of 30 Doradus. It determines together with 16 other bright stars in the center the excitation parameter of the nebula. Its effective temperature lies between 50000 and 55000K and the tipper and lower mass values are 250 and 103 solar masses. The bolometric magnitude is brighter than -l4m. The inner structure of 30 Doradus can be explained as the result of the stellar-wind of R 136.

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