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{{Starbox catalog
{{Starbox catalog
| names = [[Star catalogue#BD.2FCD.2FCPD|CD]]-48 5913, [[Henry Draper Catalogue|HD]] 93497, [[Hipparcos catalogue|HIP]] 52727, [[Star catalogue#BS, BSC, HR|HR]] 4216, [[Star catalogue#SAO|SAO]] 222321.
| names = [[Star catalogue#BD.2FCD.2FCPD|CD]]-48&nbsp;5913, [[Henry Draper Catalogue|HD]]&nbsp;93497, [[Hipparcos catalogue|HIP]]&nbsp;52727, [[Star catalogue#BS, BSC, HR|HR]]&nbsp;4216, [[Star catalogue#SAO|SAO]]&nbsp;222321.<ref name=SIMBAD/>
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<ref name=bsc1987>{{citation | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H., Jr. | title=The Bright Star Catalogue, 5th revised edition | journal=Astronomical Data Center Bulletin | volume=1 | issue=4 | pages=285–294 | year=1987 | bibcode=1987ADCBu...1..285H }}</ref>
<ref name=bsc1987>{{citation | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H., Jr. | title=The Bright Star Catalogue, 5th revised edition | journal=Astronomical Data Center Bulletin | volume=1 | issue=4 | pages=285–294 | year=1987 | bibcode=1987ADCBu...1..285H }}</ref>

<ref name=SIMBAD>{{citation | title=CCDM J10468-4925AB -- Double or multiple star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+93497 | accessdate=2012-02-03 }}</ref>


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Revision as of 02:10, 4 February 2012

Mu Velorum
Diagram showing star positions and boundaries of the Vela constellation and its surroundings
Location of μ Velorum (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 10h 46m 46.17877s[1]
Declination −49° 25′ 12.9244″[1]
Apparent magnitude (V) 2.69[2] (2.7 + 6.4)[3]
Characteristics
Spectral type G5III + G2V[3]
U−B color index +0.57[2]
B−V color index +0.90[2]
Astrometry
Radial velocity (Rv)+6.2[4] km/s
Proper motion (μ) RA: +63.22[1] mas/yr
Dec.: -54.21[1] mas/yr
Parallax (π)27.84 ± 0.38 mas[1]
Distance117 ± 2 ly
(35.9 ± 0.5 pc)
Details
Luminosity107[3] L☉
Age0.36[3] Gyr
Other designations
CD-48 5913, HD 93497, HIP 52727, HR 4216, SAO 222321.[5]

Mu Velorum (μ Vel, μ Velorum) is a binary star system in the southern constellation Vela. The two stars orbit each other with a semi-major axis of 1.437 arcseconds and a period of 116.24 years.[6] The pair have a combined apparent visual magnitude of 2.69,[2] making the system readily visible to the naked eye. From parallax measurements, the distance to this system is estimated to be 117 light-years (36 parsecs).[1]

The primary component is a giant star with an apparent magnitude of 2.7 and a stellar classification of G5 III.[3] It is radiating about 107 times the luminosity of the Sun and is about 360 million years old.[3] In 1998, the Extreme Ultraviolet Explorer space telescope detected a strong flare that released an X-ray emission nearly equal to the output of the entire star. The quiescent X-ray luminosity of Mu Velorum A is about 1.7 × 1030 erg s–1.[3]

The fainter companion, Mu Velorum B, is a main sequence star with an apparent magnitude of 6.4[3] and an assigned stellar classification of G2V.[3] However, this classification is suspect. Closer examination of the spectrum suggests the star may actually have a classification of F4V or F5V, which suggests a mass of about 1.5 times the mass of the Sun. Such stars typically do not show a marked level of magnetic activity.[3]

References

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 {{citation}}: Unknown parameter |month= ignored (help)
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J
  3. ^ a b c d e f g h i j Ayres, Thomas R.; Osten, Rachel A.; Brown, Alexander (1999), "The Rise and Fall of μ Velorum: A Remarkable Flare on a Yellow Giant Star Observed with the Extreme Ultraviolet Explorer", The Astrophysical Journal, 526 (1): 445–450, Bibcode:1999ApJ...526..445A, doi:10.1086/308001 {{citation}}: Unknown parameter |month= ignored (help)
  4. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), The Revision of the General Catalogue of Radial Velocities, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E {{citation}}: Unknown parameter |booktitle= ignored (help)
  5. ^ "CCDM J10468-4925AB -- Double or multiple star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-02-03
  6. ^ Hoffleit, D.; Warren, W. H., Jr. (1987), "The Bright Star Catalogue, 5th revised edition", Astronomical Data Center Bulletin, 1 (4): 285–294, Bibcode:1987ADCBu...1..285H{{citation}}: CS1 maint: multiple names: authors list (link)
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