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{{Short description|Binary star in the constellation Vela}}
{{Starbox begin
{{Starbox begin
| name = μ Velorum
| name = μ Velorum
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| prop_mo_ra = +63.22<ref name=aaa474_2_653/>
| prop_mo_ra = +63.22<ref name=aaa474_2_653/>
| prop_mo_dec = –54.21<ref name=aaa474_2_653/>
| prop_mo_dec = –54.21<ref name=aaa474_2_653/>
| parallax = 27.84
| parallax = 29.0506
| p_error = 0.38
| p_error = 0.2991
| parallax_footnote = <ref name=aaa474_2_653/>
| parallax_footnote =<ref name="Gaia3">{{cite Gaia EDR3|5361403934691772160}}</ref>
| absmag_v = −0.06<ref name=Cardini2005/>
| absmag_v = −0.06<ref name=Cardini2005/>
}}
}}
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{{reflist|refs=
{{reflist|refs=


<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 }}</ref>
<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 | s2cid=18759600 }}</ref>


<ref name=Cardini2005>{{citation
<ref name=Cardini2005>{{citation
Line 78: Line 79:
| journal=Astronomy and Astrophysics
| journal=Astronomy and Astrophysics
| volume=430 | pages=303–311 | date=January 2005
| volume=430 | pages=303–311 | date=January 2005
| doi=10.1051/0004-6361:20041440 | bibcode=2005A&A...430..303C |arxiv = astro-ph/0409683 }}</ref>
| doi=10.1051/0004-6361:20041440 | bibcode=2005A&A...430..303C |arxiv = astro-ph/0409683 | s2cid=12136256 }}</ref>


<ref name=rgcrv>{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | title=The Revision of the General Catalogue of Radial Velocities | book-title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | location=University of Toronto | publisher=[[International Astronomical Union]] | bibcode=1967IAUS...30...57E | postscript=. }}</ref>
<ref name=rgcrv>{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | volume=30 | page=57 | location=University of Toronto | publisher=[[International Astronomical Union]] | bibcode=1967IAUS...30...57E | postscript=. }}</ref>


<ref name=clpl4_99>{{citation | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref>
<ref name=clpl4_99>{{citation | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref>


<ref name=apj526_1_445>{{citation | last1=Ayres | first1=Thomas R. | last2=Osten | first2=Rachel A. | last3=Brown | first3=Alexander | title=The Rise and Fall of μ Velorum: A Remarkable Flare on a Yellow Giant Star Observed with the Extreme Ultraviolet Explorer | journal=The Astrophysical Journal | volume=526 | issue=1 | pages=445–450 |date=November 1999 | doi=10.1086/308001 | bibcode=1999ApJ...526..445A | postscript=. }}</ref>
<ref name=apj526_1_445>{{citation | last1=Ayres | first1=Thomas R. | last2=Osten | first2=Rachel A. | last3=Brown | first3=Alexander | title=The Rise and Fall of μ Velorum: A Remarkable Flare on a Yellow Giant Star Observed with the Extreme Ultraviolet Explorer | journal=The Astrophysical Journal | volume=526 | issue=1 | pages=445–450 |date=November 1999 | doi=10.1086/308001 | bibcode=1999ApJ...526..445A | s2cid=120689663 | postscript=. | doi-access=free }}</ref>


<ref name=bsc1987>{{citation | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H., Jr. | title=The Bright Star Catalogue |edition=5th revised | journal=Astronomical Data Center Bulletin | volume=1 | issue=4 | pages=285–294 | date=1987 | bibcode=1987ADCBu...1..285H | postscript=. }}</ref>
<ref name=bsc1987>{{citation | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H. Jr. | title=The Bright Star Catalogue |edition=5th revised | journal=Astronomical Data Center Bulletin | volume=1 | issue=4 | pages=285–294 | date=1987 | bibcode=1987ADCBu...1..285H | postscript=. }}</ref>


<ref name=apjss164_1_173>{{citation | display-authors=1 | last1=Mullan | first1=D. J. | last2=Mathioudakis | first2=M. | last3=Bloomfield | first3=D. S. | last4=Christian | first4=D. J. | title=A Comparative Study of Flaring Loops in Active Stars | journal=The Astrophysical Journal Supplement Series | volume=164 | issue=1 | pages=173–201 |date=May 2006 | doi=10.1086/502629 | bibcode=2006ApJS..164..173M | postscript=. | url=http://scholarworks.csun.edu/bitstream/10211.3/172064/1/mullan-etal-comparative-2006.pdf }}</ref>
<ref name=apjss164_1_173>{{citation | display-authors=1 | last1=Mullan | first1=D. J. | last2=Mathioudakis | first2=M. | last3=Bloomfield | first3=D. S. | last4=Christian | first4=D. J. | title=A Comparative Study of Flaring Loops in Active Stars | journal=The Astrophysical Journal Supplement Series | volume=164 | issue=1 | pages=173–201 |date=May 2006 | doi=10.1086/502629 | bibcode=2006ApJS..164..173M | postscript=. | url=http://scholarworks.csun.edu/bitstream/10211.3/172064/1/mullan-etal-comparative-2006.pdf | hdl=10211.3/172064 | s2cid=122152694 | hdl-access=free }}</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 | access-date=2012-02-03 | postscript=. }}</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 | access-date=2012-02-03 | postscript=. }}</ref>
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{{Stars of Vela}}
{{Stars of Vela}}


{{DEFAULTSORT:Mu Velorum}}
[[Category:Bayer objects|Velorum, Mu]]
[[Category:Bayer objects|Velorum, Mu]]
[[Category:Vela (constellation)]]
[[Category:Vela (constellation)]]
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[[Category:G-type giants]]
[[Category:G-type giants]]
[[Category:G-type main-sequence stars]]
[[Category:G-type main-sequence stars]]
[[Category:HR objects|4216]]
[[Category:Bright Star Catalogue objects|4216]]
[[Category:Henry Draper Catalogue objects|093497]]
[[Category:Henry Draper Catalogue objects|093497]]
[[Category:Hipparcos objects|052727]]
[[Category:Hipparcos objects|052727]]

Latest revision as of 14:51, 2 June 2024

μ Velorum
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)29.0506 ± 0.2991 mas[5]
Distance112 ± 1 ly
(34.4 ± 0.4 pc)
Absolute magnitude (MV)−0.06[6]
Orbit[7]
Period (P)138 yr
Semi-major axis (a)1.427″
Eccentricity (e)0.84
Inclination (i)57.0°
Longitude of the node (Ω)59.1°
Periastron epoch (T)1951.1
Argument of periastron (ω)
(secondary)		178.0°
Details
μ Vel A
Mass3.30[8] M☉
Radius13[9] R☉
Luminosity107[3] L☉
Surface gravity (log g)2.75[8] cgs
Temperature5,047[8] K
Rotational velocity (v sin i)6.4[8] km/s
Age360[3] Myr
Other designations
CD−48°5913, HD 93497, HIP 52727, HR 4216, SAO 222321.[10]
Database references
SIMBADdata

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.[11] (Wulff-Dieter Heintz (1986) lists a period of 138 years with his orbital elements.)[7] 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 system is about 360 million years old.[3]

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 from an expanded atmosphere about 13[9] times the Sun's radius. The mass of this star is 3.3[8] times that of the Sun. 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

[edit]
  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  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): 99, Bibcode:1966CoLPL...4...99J.
  3. ^ a b c d e f g h i j Ayres, Thomas R.; Osten, Rachel A.; Brown, Alexander (November 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, S2CID 120689663.
  4. ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
  5. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  6. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID 12136256.
  7. ^ a b Heintz, W. D. (April 1986), "Orbits of 20 visual binaries", Astronomy and Astrophysics Supplement Series, 64 (1): 1–7, Bibcode:1986A&AS...64....1H. Listed as Ru 155.
  8. ^ a b c d e Mallik, Sushma V.; Parthasarathy, M.; Pati, A. K. (October 2003), "Lithium and rotation in F and G dwarfs and subgiants", Astronomy and Astrophysics, 409: 251–261, Bibcode:2003A&A...409..251M, doi:10.1051/0004-6361:20031084.
  9. ^ a b Mullan, D. J.; et al. (May 2006), "A Comparative Study of Flaring Loops in Active Stars" (PDF), The Astrophysical Journal Supplement Series, 164 (1): 173–201, Bibcode:2006ApJS..164..173M, doi:10.1086/502629, hdl:10211.3/172064, S2CID 122152694.
  10. ^ "CCDM J10468-4925AB -- Double or multiple star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-02-03.
  11. ^ Hoffleit, D.; Warren, W. H. Jr. (1987), "The Bright Star Catalogue", Astronomical Data Center Bulletin, 1 (4) (5th revised ed.): 285–294, Bibcode:1987ADCBu...1..285H.
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