The optical spectrum of R136a - The central object of the 30 Doradus nebula

1982 ◽  
Vol 263 ◽  
pp. 108 ◽  
Author(s):  
D. C. Ebbets ◽  
P. S. Conti
Keyword(s):  
Optical Spectrum ◽  
Central Object ◽  
30 Doradus

Infrared observations of R136, the central object of the 30 Doradus Nebula

1983 ◽  
Vol 272 ◽  
pp. 123 ◽  
Author(s):  
N. Panagia ◽  
E. G. Tanzi ◽  
M. Tarenghi
Keyword(s):  
Infrared Observations ◽  
Central Object ◽  
30 Doradus

scholarly journals The Near Infrared Properties of Selected WN Stars in the Large Magellanic Cloud

1982 ◽  
Vol 99 ◽  
pp. 231-235
Author(s):  
N. Panagia ◽  
E.G. Tanzi ◽  
M. Tarenghi
Keyword(s):  
Near Infrared ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Infrared Photometry ◽  
Central Object ◽  
30 Doradus

We report here on preliminary infrared photometry of six WN stars in the Large Magellanic Cloud. Besides R136, the central object of the 30 Doradus Nebula, the sample includes three stars (R139, R140, R145) located near the center of the region (within ∼ 1 arcmin) and two more stars (R144, R147) at a distance of ∼ 5 arcmin from R136.

scholarly journals The Object R136 in the Core of the 30 Doradus Nebula

1984 ◽  
Vol 108 ◽  
pp. 261-261
Author(s):  
W. Seggewiss ◽  
A.F.J. Moffat
Keyword(s):  
Central Object ◽  
The Core ◽  
H Ii Region ◽  
30 Doradus

R136 = HD 38268 is the luminous and diffuse central object (V ~ 10m in a region of 7 arc sec diameter) of the young populous cluster NGC 2070 at the centre of the giant H II region 30 Doradus.

The nature of R136a, the superluminous central object of the 30 Doradus nebula

1983 ◽  
Vol 273 ◽  
pp. 597 ◽  
Author(s):  
B. D. Savage ◽  
E. L. Fitzpatrick ◽  
J. P. Cassinelli ◽  
D. C. Ebbets
Keyword(s):  
Central Object ◽  
30 Doradus

scholarly journals The Central Object of the 30 Doradus Nebula, a Supermassive Star

1982 ◽  
Vol 99 ◽  
pp. 563-565
Author(s):  
Joseph P. Cassinelli ◽  
John S. Mathis ◽  
Blair D. Savage
Keyword(s):  
Stellar Wind ◽  
Alternative Interpretation ◽  
Radio Continuum ◽  
High Spectral Resolution ◽  
The Sun ◽  
Hydrogen Burning ◽  
Central Object ◽  
Radio Recombination Line ◽  
Visual Magnitude ◽  
30 Doradus

The 30 Doradus nebula is the brightest H II region in the local group. Radio continuum and Radio recombination line observations indicate that it is photoionized by the equivalent of ∼100 05 stars. Observations of the central object R136 made at low and high spectral resolution with the IUE reveal a peculiar hot object with a massive stellar wind. An outflow speed of 3500 kilometers per second and a temperature of approximately 60,000 K are indicated by the spectra. The bulk of the observed ultraviolet radiation must come from R136a, the brightest and bluest component of R136. Its absolute visual magnitude and observed temperature imply a luminosity about 108 times that of the sun. Most of the ionizations produced in 30 Doradus are provided by this peculiar object. If R136a is a dense cluster of very hot stars, about 30 stars of classes 03 and WN3 exist in a region estimated to have a diameter of less than 0.1 parsec. This is inconsistent with the ultraviolet line spectrum and the evidence for optical variability. An alternative interpretation of the observations is that the radiation from R136a is dominated by a single super-luminous object with the following approximate properties: luminosity and temperature as given above, a radius 100 times that of the sun, a mass 2500 times that of the sun, and a loss rate of 10−3.5 solar masses per year. Model interior calculations for hydrogen-burning stars are consistent with these parameters. Such stars, however, are expected to be unstable, and this may account for the massive stellar wind.

Central Object of the 30 Doradus Nebula, a Supermassive Star

Science ◽  
1981 ◽  
Vol 212 (4502) ◽  
pp. 1497-1501 ◽  
Author(s):  
J. P. CASSINELLI ◽  
J. S. MATHIS ◽  
B. D. SAVAGE
Keyword(s):  
Central Object ◽  
30 Doradus

The Central Object of the 30 Doradus Nebula, a Supermassive Star

1982 ◽  
pp. 563-565
Author(s):  
Joseph P. Cassinelli ◽  
John S. Mathis ◽  
Blair D. Savage
Keyword(s):  
Central Object ◽  
30 Doradus

First results from the faint object camera - High-resolution observations of the central object R136 in the 30 Doradus nebula

1991 ◽  
Vol 378 ◽  
pp. L21 ◽  
Author(s):  
G. Weigelt ◽  
R. Albrecht ◽  
C. Barbieri ◽  
J. C. Blades ◽  
A. Boksenberg ◽  
...  
Keyword(s):  
High Resolution ◽  
Central Object ◽  
Faint Object ◽  
First Results ◽  
30 Doradus

scholarly journals New Optical Observations of R136

1984 ◽  
Vol 108 ◽  
pp. 259-260
Author(s):  
You-Hua Chu
Keyword(s):  
Globular Cluster ◽  
Spectral Properties ◽  
Optical Spectrum ◽  
The Other ◽  
Optical Observations ◽  
Early Type ◽  
Central Object ◽  
The Core ◽  
Dense Cluster ◽  
Early Type Stars

R136 is the luminous central object of the 30 Doradus nebula in the LMC. Its bluest and brightest component R136a has been interpreted as a supermassive star with a mass of approximately 2000 M⊙, based on its unusual UV spectral properties and the assumption that it is responsible for most of the ionization of the 30 Dor nebula (Feitzinger et al. 1980; Cassinelli et al. 1981; Savage et al. 1983). On the other hand, R136a has also been argued to be the core of a dense cluster, since the integrated light distribution from 0.2 to 22 pc radius centered on R136a is similar to that of a globular cluster (Moffat and Seggewiss 1983), and its optical spectrum can be synthesized by its nearby early-type stars (Melnick 1983).

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