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Ngc 3603-a1

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Title: Ngc 3603-a1  
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Subject: NGC 3603, List of most luminous known stars, Carina (constellation), Eclipsing binaries, AXP 1E 1048-59
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Ngc 3603-a1

NGC 3603-A1
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Carina
Right ascension 11h 15m 07.3s
Declination −61° 15′ 39″
Apparent magnitude (V) 11.18
Spectral type WN6h+WN6h[1]
B−V color index 1.14
Proper motion (μ) RA: 2.4 mas/yr
Dec.: 2.8 mas/yr
Distance 7,600[1] pc
Mass 120 + 92[1] M
Radius 29 + 26[1] R
Luminosity 2,500,000 + 1,500,000[1] L
Temperature 42,000 + 40,000[1] K
Other designations
NGC 3603-A1, HD 97950A1, CPD-60 2732A, NGC 3603 MDS 30, WR 43a
NGC 3603-A1a:
NGC 3603-A1b:
Database references

NGC 3603-A1 is a massive, double-eclipsing binary star system located in NGC 3603, about 20,000 light years from Earth. Its two component stars circle each other every 3.77 days. The mass of NGC 3603-A1a is 116 ± 31 solar masses and 89 ± 16 solar masses for NGC 3603-A1b.[2] This makes them the two most massive stars directly measured so far, i.e. their masses have been determined (using Keplerian orbits), and not estimated. Both show an emission-line spectrum (spectral type WN6h). A separate study resolved the pair and individually modelled their masses at 120 and 92 M .


  1. ^ a b c d e f Crowther, P. A.; Schnurr, O.; Hirschi, R.; Yusof, N.; Parker, R. J.; Goodwin, S. P.; Kassim, H. A. (2010). "The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 M stellar mass limit".  
  2. ^ Schnurr, O.; Casoli, J.; Chené, A. -N.; Moffat, A. F. J.; St-Louis, N. (2008). "The very massive binary NGC 3603-A1". Monthly Notices of the Royal Astronomical Society: Letters 389: L38.  

External links

  • Space Daily
  • Sky & Telescope : The Most Massive Star Yet?
  • Astronomy : The Most Massive Star

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