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{{Short description|Binary star in the constellation Vela}}
{{Starbox begin
{{Starbox begin
| name = Mu Velorum
| name = μ Velorum
}}
}}
{{Starbox image
{{Starbox image
| image =
| image=
{{Location mark
<div style="position: relative">[[File:Vela IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Vela constellation and its surroundings]]
|image=Vela constellation map.svg|alt=|float=center|width=280
<div style="position: absolute; left: 35.8%; top: 51.2%;">[[File:Cercle rouge 100%.svg|12px]]</div>
|label=|position=right
</div>
|mark=Red circle.svg|mark_width=12|mark_link=μ Velorum
⚫
| caption=Location of μ Velorum (circled)
|x=181|y=520
}}
⚫
|caption=Location of μ Velorum (circled)
}}
}}
{{Starbox observe
{{Starbox observe
| epoch = J2000
| epoch = J2000
| ra = {{RA|10|46|46.17877}}<ref name=aaa474_2_653/>
| ra = {{RA|10|46|46.17877}}<ref name=aaa474_2_653/>
| dec = {{DEC|−49|25|12.9244}}<ref name=aaa474_2_653/>
| dec = {{DEC|–49|25|12.9244}}<ref name=aaa474_2_653/>
| appmag_v = 2.69<ref name=clpl4_99/>
| appmag_v = 2.69<ref name=clpl4_99/> {{nowrap|(2.7 + 6.4)}}<ref name=apj526_1_445/>
| constell = [[Vela (constellation)|Vela]]
| constell = [[Vela (constellation)|Vela]]
}}
}}
Line 25: Line 29:
| radial_v = +6.2<ref name=rgcrv/>
| radial_v = +6.2<ref name=rgcrv/>
| 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 =
| absmag_v = −0.06<ref name=Cardini2005/>
}}
{{Starbox orbit
| reference = <ref name=aass64_1_1/>
| period = 138
| axis = 1.427
| eccentricity = 0.84
| inclination = 57.0
| node = 59.1
| periastron = 1951.1
| periarg = 178.0
}}
}}
{{Starbox detail
{{Starbox detail
| mass =
| component1 = μ Vel A
| mass = 3.30<ref name=aaa409_251/>
| radius =
| radius = 13<ref name=apjss164_1_173/>
| gravity =
| gravity = 2.75<ref name=aaa409_251/>
| luminosity = 107<ref name=apj526_1_445/>
| luminosity = 107<ref name=apj526_1_445/>
| temperature =
| temperature = 5,047<ref name=aaa409_251/>
| metal_fe =
| metal_fe =
| rotational_velocity =
| rotational_velocity = 6.4<ref name=aaa409_251/>
| age_gyr = 0.36<ref name=apj526_1_445/>
| age_myr = 360<ref name=apj526_1_445/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| 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.
| names = [[Star catalogue#BD.2FCD.2FCPD|CD]]&minus;48°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/>
}}
{{Starbox reference
| Simbad = mu+Vel
}}
}}
{{Starbox end}}
{{Starbox end}}
'''Mu Velorum''' (μ Vel, μ Velorum) is a [[binary star]] system in the southern [[constellation]] [[Vela (constellation)|Vela]]. The two stars orbit each other with a [[semi-major axis]] of 1.437&nbsp;[[arcsecond]]s and a [[orbital period|period]] of 116.24&nbsp;years.<ref name=bsc1987/> ([[Wulff-Dieter Heintz]] (1986) lists a period of 138 years with his orbital elements.)<ref name=aass64_1_1/> The pair have a combined [[apparent visual magnitude]] of 2.69,<ref name=clpl4_99/> making the system readily visible to the naked eye. From [[parallax]] measurements, the distance to this system is estimated to be {{Convert|117|ly|pc|abbr=off|lk=on}}.<ref name=aaa474_2_653/> The system is about 360&nbsp;million years old.<ref name=apj526_1_445/>
'''Mu Velorum''' (μ Vel, μ Velorum) is a [[binary star]] in the [[constellation]] [[Vela (constellation)|Vela]]. It is approximately 116 [[light years]] from [[Earth]]. Mu Velorum is approximately 38 solar diameters, almost as big as [[Aldebaran]].


The primary component is a [[giant star]] with an apparent magnitude of 2.7 and a [[stellar classification]] of G5&nbsp;III.<ref name=apj526_1_445/> It is radiating about 107 times the luminosity of the Sun from an expanded atmosphere about 13<ref name=apjss164_1_173/> times the Sun's radius. The mass of this star is 3.3<ref name=aaa409_251/> 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 {{nowrap|1.7 × 10<sup>30</sup> erg s<sup>−1</sup>}}.<ref name=apj526_1_445/>
The primary component, '''Mu Velorum A''', is a yellow [[stellar classification|G-type]] [[giant star|giant]] with an [[apparent magnitude]] of +2.69. The companion is a yellow G-type [[main sequence|main sequence dwarf]] with an apparent magnitude of +6.6. The two stars are 0.7 [[arcsecond]]s apart and complete one orbit every 116.24 years.


⚫
The fainter companion, Mu Velorum B, is a [[main sequence]] star with an apparent magnitude of 6.4<ref name=apj526_1_445/> and an assigned stellar classification of G2V.<ref name=apj526_1_445/> However, this classification is suspect. Closer examination of the [[stellar spectrum|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 [[stellar magnetic field|magnetic activity]].<ref name=apj526_1_445/>
The quiescent X-ray luminosity of the giant star is about 1.7 × 10<sup>30</sup> erg s<sup>–1</sup>. In 1998, a strong UV flare was observed with the EUVE, which released an X-ray emission nearly equal to the output of the entire star.<ref name=apj526_1_445/>

⚫
The secondary component has a nominal stellar classification of G2V, but this classification is somewhat suspect. Examination of the spectrum suggests the star may actually be F4V or F5V, with a mass of about 1.5 times the mass of the Sun. Such stars do not typically show a marked level of magnetic activity.<ref name=apj526_1_445/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen | year=2007 | month=November | 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 }}</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=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 | booktitle=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 }}</ref>
| title=Mg II chromospheric radiative loss rates in cool active and quiet stars
| last1=Cardini | first1=D. | postscript=.
| journal=Astronomy and Astrophysics
| volume=430 | pages=303–311 | date=January 2005
| doi=10.1051/0004-6361:20041440 | bibcode=2005A&A...430..303C |arxiv = astro-ph/0409683 | s2cid=12136256 }}</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 | year=1966 | bibcode=1966CoLPL...4...99J }}</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=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 | month=November | year=1999 | doi=10.1086/308001 | bibcode=1999ApJ...526..445A }}</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 | 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=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=aass64_1_1>{{citation | last1=Heintz | first1=W. D. | title=Orbits of 20 visual binaries | journal=Astronomy and Astrophysics Supplement Series | volume=64 | issue=1 | pages=1–7 |date=April 1986 | bibcode=1986A&AS...64....1H | postscript=. }} Listed as Ru 155.</ref>

<ref name=aaa409_251>{{citation | last1=Mallik | first1=Sushma V. | last2=Parthasarathy | first2=M. | last3=Pati | first3=A. K. | title=Lithium and rotation in F and G dwarfs and subgiants | journal=Astronomy and Astrophysics | volume=409 | pages=251–261 |date=October 2003 | doi=10.1051/0004-6361:20031084 | bibcode=2003A&A...409..251M | postscript=. | doi-access=free }}</ref>


}}
}}
{{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)]]
[[Category:Binary stars]]
[[Category:Binary stars]]
[[Category:G-type giants]]
[[Category:G-type giants]]
[[Category:G-type main sequence stars]]
[[Category:G-type main-sequence stars]]
[[Category:Bright Star Catalogue objects|4216]]

[[Category:Henry Draper Catalogue objects|093497]]
{{Star-system-stub}}
[[Category:Hipparcos objects|052727]]

[[Category:Durchmusterung objects]]
[[de:My Velorum]]
⚫
[[es:Mu Velorum]]
[[fa:مو بادبان]]
[[fr:Mu Velorum]]
[[it:Mu Velorum]]
[[pt:Mu Velorum]]

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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