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This article's factual accuracy is disputed. (June 2008) |
R136a
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Observation data
Epoch J2000 Equinox J2000 |
| Constellation |
Dorado |
| Right ascension |
05h 38m 42.399s |
| Declination |
-69° 06' 02.81"' |
| Apparent magnitude (V) |
9.5 |
| Characteristics |
| Spectral type |
Wr |
| U-B color index |
? |
| B-V color index |
? |
| Variable type |
None |
| Astrometry |
| Radial velocity (Rv) |
274 km/s |
| Proper motion (μ) |
RA: 2.7 mas/yr
Dec.: 8.0 mas/yr |
| Absolute magnitude (MV) |
9.63 |
| Distance |
65.199723 kLy
(19,99 kpc)
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| Details |
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| Mass |
? M☉ |
| Radius |
? R☉ |
| Luminosity |
? L☉ |
| Temperature |
? K |
| Metallicity |
? |
| Rotation |
? |
| Age |
? years |
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| Other designations |
* 30 Dor, HD 38268, Brey 82, HTR 15, CAL 72, TYC 9163-1014-1, FD 66, UCAC2 1803442, CD-69° 324, GC 7114, MH 15, CPD-69° 456, CSI-69 456 41, Dor IRS 99, GSC 09163-01014, SAO 249329. |
| Database references |
| SIMBAD |
data |
| Image |
Click me |
R136a is a compact star cluster near the center of the 30 Doradus complex (also known as the Tarantula Nebula), in the Large Magellanic Cloud.
The cluster contains, among other things, twelve very massive and luminous stars in its core. These stars are almost exclusively of spectral type O3, and had initial masses calculated to be in the range of 37 to 76 Mo[1]. As of 2008, there are 39 confirmed O3 stars in R136a.[2] Additionally, there are several confirmed WR stars.[2]
[edit] Components
[edit] Citations
- ^ Koter, Heap, and Hubeny. "An Empirical Isochrone of Very Massive Stars in R136A". The Astrophysical Journal.
- ^ a b Lebouteiller, V.; Bernard-Salas, J.; Brandl, B.; Whelan, D. G.; Wu, Yanling; Charmandaris, V.; Devost, D.; Houck, J. R. (June 2008), "Chemical Composition and Mixing in Giant H II Regions: NGC 3603, 30 Doradus, and N66", The Astrophysical Journal 680 (1): 398–419, doi:10.1086/587503, http://adsabs.harvard.edu/abs/2008ApJ...680..398L
[edit] References
[edit] See also
