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

Infrared Observations of Ongoing Star Formation in the 30 Doradus Nebula and a Comparison with [ITAL]Hubble[/ITAL] [ITAL]Space[/ITAL] [ITAL]T[/ITAL][ITAL]elescope[/ITAL] WFPC2 Images

1998 ◽  
Vol 116 (4) ◽  
pp. 1708-1718 ◽  
Author(s):  
Mónica Rubio ◽  
Rodolfo H. Barbá ◽  
Nolan R. Walborn ◽  
Ronald G. Probst ◽  
Jorge García ◽  
...  
Keyword(s):  
Star Formation ◽  
Infrared Observations ◽  
30 Doradus

scholarly journals The Luminosity of the Central Parsec of the Galaxy

1989 ◽  
Vol 136 ◽  
pp. 423-436
Author(s):  
M. W. Werner ◽  
J. A. Davidson
Keyword(s):  
Near Infrared ◽  
Galactic Center ◽  
Thermal Emission ◽  
Large Magellanic Cloud ◽  
Infrared Emission ◽  
Infrared Observations ◽  
The Galaxy ◽  
Infrared Wavelengths ◽  
Central Parsec ◽  
30 Doradus

The luminosity of the central 5 pc of the Galaxy -encompassing the inner regions of the rotating ring of dust and gas which surrounds the galactic center - emerges primarily at infrared wavelengths in the form of thermal emission from heated dust. The nature and location of the sources which heat the dust can be inferred from the spatial and temperature distribution of the thermal infrared emission (λ>20um), from studies of the ionized gas in this region, and from direct imaging in the near infrared. These observations show that the principal heating sources within this 5-pc region are concentrated within the central parsec of the Galaxy and indicate that the luminosity of these sources is within a factor of two of 107 LO. The near-infrared observations of the compact sources at the galactic center do not reveal a single dominant source but suggest instead that the several components of the IRS-16 complex, taken together, may contribute the bulk of the luminosity; however, the data also permit a single object to dominate the energetics of this region. We draw attention to the striking morphological similarities between the galactic center and the innermost regions of the 30 Doradus nebula in the Large Magellanic Cloud and speculate that the luminosity sources in the galactic center may resemble the early-type supergiants in 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
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