WR 21a
WR 21a is a binary star in the constellation Carina. It includes one of the most massive known stars and is one of the most massive binaries. WR 21a lies near the Westerlund 2 open cluster and likely to be an ejected member. The distance of WR 21a was not definitely known until Gaia mission. There have been estimates from 2.85 kpc to around 8 kpc, with consequent uncertainties in the system luminosity. The larger distance was preferred because of consistency with the derived orbital parameters.
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WR 21a
WR 21a is a binary star in the constellation Carina. It includes one of the most massive known stars and is one of the most massive binaries. WR 21a lies near the Westerlund 2 open cluster and likely to be an ejected member. The distance of WR 21a was not definitely known until Gaia mission. There have been estimates from 2.85 kpc to around 8 kpc, with consequent uncertainties in the system luminosity. The larger distance was preferred because of consistency with the derived orbital parameters.
has abstract
WR 21a is a binary star in the ...... o bright at radio wavelengths.
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50,143,738
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1,016,438,627
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absmag v
−7.20
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age myr
appmag v
b-v
+1.507
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caption
Location of WR 21a near RCW 49
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class
O3/WN5ha + O3Vz
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component
O
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WR
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constell
eccentricity
epoch
J2000
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inclination
luminosity
name
O
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p error
parallax
period unitless
950.3999999999999
primary
WR
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prop mo dec
prop mo ra
temperature
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subject
comment
WR 21a is a binary star in the ...... he derived orbital parameters.
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label
WR 21a
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WR 21a
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