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- Q1328350 subject Q7009248.
- Q1328350 subject Q7465898.
- Q1328350 subject Q7465903.
- Q1328350 subject Q7847054.
- Q1328350 subject Q8393112.
- Q1328350 subject Q8398144.
- Q1328350 subject Q8661406.
- Q1328350 abstract "NGC 3603-A1 (HD 97950A1) is a double-eclipsing binary star system located at the centre of the HD 97950 cluster in the NGC 3603 star-forming region, about 20,000 light years from Earth. Both stars are of spectral type WN6h and among the most luminous and most massive known.HD 97950 was catalogued as a star, but was known to be a dense cluster or close multiple star. In 1926, the six brightest members were given letters from A to F, although several of them have since been resolved into more than one star. Star A was first resolved into three components using speckle interferometry, although they can now be directly imaged using space-based or adaptive optics. Component A1 was finally determined to be a spectroscopic binary.The two component stars of NGC 3603-A1 circle each other every 3.77 days, and show brightness variations of about 0.3 magnitudes due to eclipses. The stars orbit very close to each other, separated by barely their own diameters and at or near to filling their roche lobes.The masses of A1a and A1b determined from the orbital parameters are 116 ± 31 M☉ and 89 ± 16 M☉respectively. This makes them the two most massive stars directly measured, i.e. with their masses determined (using Keplerian orbits), and not estimated from models. The masses estimated from analysis of the physical properties are slightly higher at 120 M☉ and 92 M☉.Each component is a Wolf-Rayet (WR) star, with spectra dominated by strong broadened emission lines. Type WN6 indicates that ionised nitrogen lines are strong in comparison to ionised carbon lines, and the suffix h indicates that hydrogen is also seen in the spectrum. This type of WR star is not the classical stripped helium-burning aged star, but a young highly luminous object with CNO cycle fusion products showing at the surface due to strong conventional and rotational mixing, and high mass loss rates from the atmosphere. The emission lines are generated in the stellar wind and the photosphere is completely hidden. The surface fraction of hydrogen is still estimated to be 60-70%.Although the stars are very young, around 1.5 million years old, they have already lost a considerable fraction of their initial masses. The initial masses are estimated to have been 148 M☉ and 106 M☉, meaning they have lost 28 M☉ and 14 M☉ respectively.".
- Q1328350 thumbnail NGC3603_core.jpg?width=300.
- Q1328350 wikiPageExternalLink ap071005.html.
- Q1328350 wikiPageExternalLink image_feature_2099.html.
- Q1328350 wikiPageExternalLink A_Team_Of_Astronomers_Identifies_The_Most_Massive_Star_Ever_999.html.
- Q1328350 wikiPageWikiLink Q10470.
- Q1328350 wikiPageWikiLink Q111130.
- Q1328350 wikiPageWikiLink Q11282.
- Q1328350 wikiPageWikiLink Q1141760.
- Q1328350 wikiPageWikiLink Q1142077.
- Q1328350 wikiPageWikiLink Q1205564.
- Q1328350 wikiPageWikiLink Q1559114.
- Q1328350 wikiPageWikiLink Q1666400.
- Q1328350 wikiPageWikiLink Q2.
- Q1328350 wikiPageWikiLink Q222971.
- Q1328350 wikiPageWikiLink Q2513.
- Q1328350 wikiPageWikiLink Q2703.
- Q1328350 wikiPageWikiLink Q50053.
- Q1328350 wikiPageWikiLink Q5097430.
- Q1328350 wikiPageWikiLink Q531.
- Q1328350 wikiPageWikiLink Q555846.
- Q1328350 wikiPageWikiLink Q6251.
- Q1328350 wikiPageWikiLink Q6372.
- Q1328350 wikiPageWikiLink Q654396.
- Q1328350 wikiPageWikiLink Q7009248.
- Q1328350 wikiPageWikiLink Q7465898.
- Q1328350 wikiPageWikiLink Q7465903.
- Q1328350 wikiPageWikiLink Q7847054.
- Q1328350 wikiPageWikiLink Q8393112.
- Q1328350 wikiPageWikiLink Q8398144.
- Q1328350 wikiPageWikiLink Q845735.
- Q1328350 wikiPageWikiLink Q848485.
- Q1328350 wikiPageWikiLink Q8661406.
- Q1328350 wikiPageWikiLink Q913103.
- Q1328350 type Place.
- Q1328350 type CelestialBody.
- Q1328350 type Location.
- Q1328350 type Place.
- Q1328350 type Star.
- Q1328350 type Thing.
- Q1328350 comment "NGC 3603-A1 (HD 97950A1) is a double-eclipsing binary star system located at the centre of the HD 97950 cluster in the NGC 3603 star-forming region, about 20,000 light years from Earth. Both stars are of spectral type WN6h and among the most luminous and most massive known.HD 97950 was catalogued as a star, but was known to be a dense cluster or close multiple star.".
- Q1328350 label "NGC 3603-A1".
- Q1328350 depiction NGC3603_core.jpg.
- Q1328350 name "NGC 3603-A1".