Mu Columbae

Mu Columbae
Mu Columbae
Observation data
Epoch J2000      Equinox J2000
Constellation Columba
Right ascension 05h 45m 59.9s
Declination -32° 18′ 23″
Apparent magnitude (V) 5.15
Characteristics
Spectral type O9.5 V
U−B color index -1.06
B−V color index -0.28
Variable type Suspected
Astrometry
Radial velocity (Rv) +109.2 km/s
Proper motion (μ) RA: 3.01 mas/yr
Dec.: -22.62 mas/yr
Parallax (π) 2.52 ± 0.55 mas
Distance 1300 ly
(400 pc)
Absolute magnitude (MV) -2.84
Details
Mass 12-15 M
Radius 4.5 R
Luminosity 23,300 L
Temperature 33,700 K
Metallicity ?
Rotation 1.5 days (~153 km/s.)
Age 2.7 × 106 years
Other designations
HR 1996, CD -32°2538, HD 38666, SAO 196149, HIP 27204.

Mu Columbae (μ Col, μ Columbae) is a star in the constellation of Columba. It is one of the few O-class stars that is visible to the unaided eye. The star is known to lie approximately 1,300 light years from our solar system (with an error margin of a few hundred light years).

This is a relatively fast rotating star that completes a full revolution approximately every 1.5 days. (Compare this to our Sun, which at only 22% of this star's diameter rotates only once every 25.4 days.) This rate of rotation is fairly typical for stars of this class.

Based on measurements of proper motion and radial velocity, astronomers know that this star and AE Aurigae are moving away from each other at a relative velocity of over 200 km/s. Their common point of origin intersects with Iota Orionis in the Trapezium cluster, some two and half million years in the past. The most likely scenario that could have created these runaway stars is a collision between two binary star systems, with the stars being ejected along different trajectories radial to the point of intersection.

Etymology

In Chinese astronomy, Mu Columbae is called 屎, Pinyin: Shǐ, meaning Excrement, because this star is marking itself and stand alone in Excrement asterism, Three Stars mansion (see : Chinese constellation)[1]. 屎 (Shǐ) westernized into She by R.H. Allen, with the meaning is "the Secretions" [2]

This star, along with ζ CMa, λ CMa, γ Col, δ Col, θ Col, κ Col, λ Col and ξ Col, were Al Ḳurūd (ألقرد - al-qird), the Apes.[3]

References

  • A. Blaauw & W.W. Morgan, 1954, "The Space Motions of AE Aurigae and mu Columbae with Respect to the Orion Nebula", Astrophysical Journal, v.119, p.625.
  • R. Hoogerwerf, J.H.J. de Bruijne, P.T. de Zeeuw, 2000, "The origin of runaway stars", Astrophysical Journal, v.544, issue 2, pp. L133-L136.

External links


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Look at other dictionaries:

  • COLUMBAE Internuneiae — olim hodieque adhibitae, Pernicissimus enim earum volatus, cumque reliquae omnes aves, volando fessae, super petram aut super arborem, sugiant et capiantur: sola columba, cum fessa est, alarum unam comprimit, et alterâ volat, sicque evadit, uti… …   Hofmann J. Lexicon universale

  • Columbae — Co*lum b[ae], n. pl.; [L. columba pigeon.] (Zo[ o]l.) An order of birds, including the pigeons. [1913 Webster] || …   The Collaborative International Dictionary of English

  • Columbae radix — (Pharm.), so v. w. Columbowurzel …   Pierer's Universal-Lexikon

  • COLUMBAE — I. COLUMBAE in multiplici Sacrificiorum apud Hebraeos olim usu fuêre. Non einim solum ad esum hi columbas, sed etiam ad sacrificia exquirebant, quae multorum erant generum. Sic Levit. c. 1. v. 14. agitur de spontaneo holocausto e turturibus, aut… …   Hofmann J. Lexicon universale

  • columbae — co·lum·bae …   English syllables

  • columbae — kəˈləmbē noun plural Usage: capitalized Etymology: New Latin, from Latin, plural of columba : a suborder of birds (order Columbiformes) consisting of the doves and pigeons and the extinct dodo and solitaire …   Useful english dictionary

  • My Columbae — Datenbanklinks zu μ Columbae Stern μ Columbae …   Deutsch Wikipedia

  • Отряд Голуби (Columbae, или ColumWormes) —          Отряд голубей объединяет значительное число видов птиц средней и небольшой величины. По внешнему виду и общему строению все они очень сходны между собой и хорошо отличаются от других птиц.         Телосложение у голубей плотное, голова… …   Биологическая энциклопедия

  • Mu Columbae — Constelación Columba Ascensión recta α 05h 45min 59,90s Declinación δ 32º 18’ 23,2’’ Distancia …   Wikipedia Español

  • Beta Columbae — β Columbae Observation data Epoch J2000.0      Equinox J2000.0 (ICRS) Constellation Columba Right ascension 05h 50m 57.5929s[ …   Wikipedia

  • AP Columbae — Constelación Columba Ascensión recta α 06h 04min 52,16s Declinación δ 34º 33’ 36,1’’ Distancia …   Wikipedia Español

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