Omega Carinae

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ω Carinae
Location of ω Carinae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 13m 44.21739s[1]
Declination –70° 02′ 16.4563″[1]
Apparent magnitude (V) 3.29[2]
Characteristics
Spectral type B8 IIIe[3]
U−B color index –0.285[4]
B−V color index –0.083[4]
Distance
342 ± 3 ly
(104.8 ± 1.0 pc)
Absolute magnitude (MV)−1.81[5]
Details
Rotational velocity (v sin i)
240[7] km/s
HR 4037, SAO 250885[8]
Database references
SIMBADdata

Omega Carinae,

apparent visual magnitude of 3.3 and is located at a distance of about 342 light-years (105 parsecs) from Earth
.

Properties

Omega Carinae has a

luminosity class of III indicates it has evolved into a giant star, having exhausted the hydrogen at its core and left the main sequence. The effective temperature of 11,630 K[7]
in its outer envelope is what gives this star the blue-white hue that is characteristic of B-type stars.

This star is rotating rapidly with a projected rotational velocity of 240 km/s,[7] which gives a lower limit to the star's azimuthal velocity along the equator. The critical equatorial velocity, at which the star would begin to break up, is 320 km s−1. The star's axis of rotation is inclined by an estimated angle of 70.8° to the line of sight from the Earth.[9]

In the next 7500 years, the south Celestial pole will pass close to this star (AD 5800) and then I Carinae.[10]

In culture

In Chinese, 南船 (Nán Chuán), meaning Southern Boat, refers to an asterism consisting of ω Carinae, V337 Carinae, PP Carinae, θ Carinae and β Carinae .[11] Consequently, ω Carinae itself is known as 南船四 (Nán Chuán sì, English: the Fourth Star of Southern Boat.)[12]

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1999VeARI..35....1W
  3. ^
    doi:10.1051/0004-6361:20053008
  4. ^
    doi:10.1086/190168
  5. S2CID 119257644
  6. doi:10.1093/mnras/stx3075
  7. ^
    hdl:11336/37946
  8. Centre de Données astronomiques de Strasbourg
    , retrieved 2012-01-13
  9. S2CID 19016751
  10. ^ Kieron Taylor (2005), "Precession", moonkmft, retrieved 2020-01-19
  11. ISBN 978-986-7332-25-7
    .
  12. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 28 日

External links

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