V539 Arae

V539 Arae
	The location of V539 Arae (circled)
Observation data; EpochJ2000EquinoxJ2000
Constellation	Ara
Right ascension	17h50m28.39341s
Declination	–53° 36′ 44.6701″
Apparent magnitude(V)	5.62
Characteristics
Spectral type	B2 V + B3 V + A1 V
U−Bcolor index	–0.64
B−Vcolor index	–0.08
Variable type	Algol variable
Astrometry
Radial velocity(Rv)	-8km/s
Proper motion(μ)	RA:+3.18mas/yr; Dec.:–11.40mas/yr
Parallax(π)	3.30 ± 0.47mas
Distance	approx. 1,000ly; (approx. 300pc)
Absolute magnitude(MV)	–1.83/–1.11
Details
ν1Ara A
Mass	6.240 ± 0.066M☉
Radius	4.516 ± 0.084R☉
Luminosity	1,963L☉
Surface gravity(logg)	3.924 ± 0.016cgs
Temperature	18,100 ± 500K
Rotational velocity(vsini)	100km/s
Age	23.2 ± 2.9Myr
ν1Ara B
Mass	5.314 ± 0.060M☉
Radius	3.428 ± 0.083R☉
Luminosity	902L☉
Surface gravity(logg)	4.093 ± 0.021cgs
Temperature	17,100 ± 500K
Rotational velocity(vsini)	130km/s
Other designations
	V539 Ara,CD−53° 7423,HD161783,HIP87314,HR6622,SAO245065.
Database references
SIMBAD	AB
	A

V539 Arae(Bayer designationNu¹Arae(ν¹Arae / ν¹Ara)) is atriple star systemin thesouthern constellationofAra.Based upon an annualparallaxshift of3.30 ± 0.47,^[1]this system is at a distance of roughly 1,000light-years(310parsecs) from Earth.

Avisual band light curvefor V539 Arae, adapted from Knipe (1971)^[7]

The core members of this system, ν¹Ara AB, consist of a pair ofB-type main-sequence starsin a close orbit with aperiodof 3.169 days and aneccentricityof 0.06. Their respectivestellar classificationsare B2 V and B3 V, and they have a combinedvisual magnitudeof 5.65. Because theorbital planelies close to the line of sight from the Earth, this pair form a detachedeclipsing binaryof theAlgol type.^[6]The eclipse of the primary causes a decrease of 0.52 in magnitude, while the secondary eclipse decreases the magnitude by 0.43.^[8]At anangular separationof 12.34arcseconds,is the tertiary component of this system; a magnitude 9.40A-type main-sequence starwith a classification of A1 V.^[2]

The system is sometimes referred asUpsilon¹Arae(υ¹Arae), and more generally unlettered.^[9]

References

^^a ^b ^c ^d ^e ^fvan 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.
^^a ^b ^cEggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society,389(2): 869–879,arXiv:0806.2878,Bibcode:2008MNRAS.389..869E,doi:10.1111/j.1365-2966.2008.13596.x,S2CID 14878976.
^^a ^b ^cWilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities",Carnegie Institute Washington D.C. Publication,Carnegie Institution of Washington,Bibcode:1953GCRV..C......0W.
^^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^kTorres, G.; Andersen, J.; Giménez, A. (February 2010), "Accurate masses and radii of normal stars: modern results and applications",The Astronomy and Astrophysics Review,18(1–2): 67–126,arXiv:0908.2624,Bibcode:2010A&ARv..18...67T,doi:10.1007/s00159-009-0025-1,S2CID 14006009.
^Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",Monthly Notices of the Royal Astronomical Society,410(1): 190–200,arXiv:1007.4883,Bibcode:2011MNRAS.410..190T,doi:10.1111/j.1365-2966.2010.17434.x,S2CID 118629873.
^^a ^b"V* V539 Ara".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2010-07-31.
^Knipe, G. F. G. (September 1971)."The light curve and orbital elements of V539 Arae".Astronomy & Astrophysics.14:70–77.Bibcode:1971A&A....14...70K.Retrieved25 October2021.
^Malkov, O. Yu.; Oblak, E.; Snegireva, E. A.; Torra, J. (February 2006), "A catalogue of eclipsing variables",Astronomy and Astrophysics,446(2): 785–789,Bibcode:2006A&A...446..785M,doi:10.1051/0004-6361:20053137,hdl:10995/73280.
^Note for HR 6622:Hoffleit, D., Warren, Jr., W. H., (1991).The Bright Star Catalogue,(5th Revised Ed).

External links

VizieR Detailed Page:HR 6622
AladinPreviewer: Image ofNu¹Arae

[aaa474_2_653-1] 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.

[mnras389_2_869-2] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society,389(2): 869–879,arXiv:0806.2878,Bibcode:2008MNRAS.389..869E,doi:10.1111/j.1365-2966.2008.13596.x,S2CID 14878976.

[gcrv1953-3] Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities",Carnegie Institute Washington D.C. Publication,Carnegie Institution of Washington,Bibcode:1953GCRV..C......0W.

[aar18_1_2-4] ^^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^kTorres, G.; Andersen, J.; Giménez, A. (February 2010), "Accurate masses and radii of normal stars: modern results and applications",The Astronomy and Astrophysics Review,18(1–2): 67–126,arXiv:0908.2624,Bibcode:2010A&ARv..18...67T,doi:10.1007/s00159-009-0025-1,S2CID 14006009.

[mnras410_1_190-5] Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",Monthly Notices of the Royal Astronomical Society,410(1): 190–200,arXiv:1007.4883,Bibcode:2011MNRAS.410..190T,doi:10.1111/j.1365-2966.2010.17434.x,S2CID 118629873.

[SIMBAD-6] "V* V539 Ara".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2010-07-31.

[Knipe-7] Knipe, G. F. G. (September 1971)."The light curve and orbital elements of V539 Arae".Astronomy & Astrophysics.14:70–77.Bibcode:1971A&A....14...70K.Retrieved25 October2021.

[aaa446_2_785-8] Malkov, O. Yu.; Oblak, E.; Snegireva, E. A.; Torra, J. (February 2006), "A catalogue of eclipsing variables",Astronomy and Astrophysics,446(2): 785–789,Bibcode:2006A&A...446..785M,doi:10.1051/0004-6361:20053137,hdl:10995/73280.

[bsc-9] Note for HR 6622:Hoffleit, D., Warren, Jr., W. H., (1991).The Bright Star Catalogue,(5th Revised Ed).

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Observation data EpochJ2000EquinoxJ2000
The location of V539 Arae (circled)
Constellation	Ara
Right ascension	17^h50^m28.39341^s^[1]
Declination	–53° 36′ 44.6701″^[1]
Apparent magnitude(V)	5.62^[2]
Characteristics
Spectral type	B2 V + B3 V + A1 V^[2]
U−Bcolor index	–0.64
B−Vcolor index	–0.08
Variable type	Algol variable
Astrometry

Radial velocity(R_v)	-8^[3]km/s
Proper motion(μ)	RA:+3.18^[1]mas/yr Dec.:–11.40^[1]mas/yr
Parallax(π)	3.30 ± 0.47mas^[1]
Distance	approx. 1,000ly (approx. 300pc)
Absolute magnitude(M_V)	–1.83/–1.11^[4]

Details
ν¹Ara A
Mass	6.240 ± 0.066^[4]`M`_☉
Radius	4.516 ± 0.084^[4]`R`_☉
Luminosity	1,963^[4]`L`_☉
Surface gravity(logg)	3.924 ± 0.016^[4]cgs
Temperature	18,100 ± 500^[4]K
Rotational velocity(vsini)	100^[3]km/s
Age	23.2 ± 2.9^[5]Myr
ν¹Ara B
Mass	5.314 ± 0.060^[4]`M`_☉
Radius	3.428 ± 0.083^[4]`R`_☉
Luminosity	902^[4]`L`_☉
Surface gravity(logg)	4.093 ± 0.021^[4]cgs
Temperature	17,100 ± 500^[4]K
Rotational velocity(vsini)	130^[3]km/s
Other designations
V539 Ara,CD−53° 7423,HD161783,HIP87314,HR6622,SAO245065.^[6]
Database references
SIMBAD	AB
	A