Chi Carinae
Chi Carinae, Latinized from χ Carinae (), is a star in the southern constellation of Carina. It is a third-magnitude star and is one of the brighter members of the constellation. The distance to the star can be determined directly through parallax measurements, yielding an estimate of roughly with a 6.7% margin of error. This star is a suspected astrometric binary, although nothing is known about the companion.

This is a massive star, with about seven times the mass of the Sun. It is about 40 million years old and rotating rapidly; the projected rotational velocity has been measured as high as . The spectrum of this star matches a stellar classification of B3 IV, with the luminosity class of IV indicating this is likely a subgiant star that has nearly exhausted the supply of hydrogen at its core and is in the process of evolving into a giant star.

In 1969, Chi Carinae was classified as chemically peculiar Ap star because its absorption lines of silicon appeared unusually strong relative to the lines for helium. However, subsequent examination in the ultraviolet band showed the silicon bands were as expected and it was determined the spectra is normal for a star of its type. There is no indication of variability in the star's spectrum. Observation during the Hipparcos mission showed no photometric variability down to a limit of ±0.003 magnitudes. For this reason, the star has been ruled out as a Beta Cephei type variable star.
Q1806983
Latinized
UNK
Q523
star
Concept
Q8928
constellation
Concept
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Carina
CEL
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brighter members
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parallax
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margin of error
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projected rotational velocity
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spectrum
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stellar classification
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luminosity class
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subgiant star
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evolving
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giant star
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chemically peculiar
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Ap star
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absorption line
Concept
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silicon
Concept
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Hipparcos
MISC
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Beta Cephei type
CEL
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variable star
Concept
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Chi Carinae
CEL
Q2444533
Chi Carinae
CEL
1969-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1969
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3
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0.003
NUMBER
instance of
constellation
type of variable star
instance of
instance of
subclass of
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