V539 Arae

V539 Arae
	The location of V539 Arae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Ara
Right ascension	17h 50m 28.39341s
Declination	–53° 36′ 44.6701″
Apparent magnitude (V)	5.62
Characteristics
Spectral type	B2 V + B3 V + A1 V
U−B color index	–0.64
B−V color index	–0.08
Variable type	Algol variable
Astrometry
Radial velocity (Rv)	-8 km/s
Proper motion (μ)	RA: +3.18 mas/yr ; Dec.: –11.40 mas/yr
Parallax (π)	3.30 ± 0.47 mas
Distance	approx. 1,000 ly ; (approx. 300 pc)
Absolute magnitude (MV)	–1.83/–1.11
Details
ν1 Ara A
Mass	6.240 ± 0.066 M☉
Radius	4.516 ± 0.084 R☉
Luminosity	1,963 L☉
Surface gravity (log g)	3.924 ± 0.016 cgs
Temperature	18,100 ± 500 K
Rotational velocity (v sin i)	100 km/s
Age	23.2 ± 2.9 Myr
ν1 Ara B
Mass	5.314 ± 0.060 M☉
Radius	3.428 ± 0.083 R☉
Luminosity	902 L☉
Surface gravity (log g)	4.093 ± 0.021 cgs
Temperature	17,100 ± 500 K
Rotational velocity (v sin i)	130 km/s
Other designations
	V539 Ara, CD−53° 7423, HD 161783, HIP 87314, HR 6622, SAO 245065.
Database references
SIMBAD	AB
	A

V539 Arae (Bayer designation Nu¹ Arae (ν¹ Arae / ν¹ Ara)) is a triple star system in the southern constellation of Ara. Based upon an annual parallax shift of 3.30 ± 0.47,^[1] this system is at a distance of roughly 1,000 light-years (310 parsecs) from Earth.

A visual band light curve for V539 Arae, adapted from Knipe (1971)^[7]

The core members of this system, ν¹ Ara AB, consist of a pair of B-type main-sequence stars in a close orbit with a period of 3.169 days and an eccentricity of 0.06. Their respective stellar classifications are B2 V and B3 V, and they have a combined visual magnitude of 5.65. Because the orbital plane lies close to the line of sight from the Earth, this pair form a detached eclipsing binary of the Algol 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 an angular separation of 12.34 arcseconds, is the tertiary component of this system; a magnitude 9.40 A-type main-sequence star with a classification of A1 V.^[2]

The system is sometimes referred as Upsilon¹ Arae (υ¹ Arae), and more generally unlettered.^[9]

References

^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c 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.
^ ^a ^b ^c Wilson, 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 ^k Torres, 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. Retrieved 2010-07-31.
^ 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. Retrieved 25 October 2021.
^ 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 of Nu¹ Arae

[aaa474_2_653-1] ^ ^a ^b ^c ^d ^e ^f 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 ^k Torres, 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. Retrieved 2010-07-31.

[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. Retrieved 25 October 2021.

[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 Epoch J2000 Equinox J2000
The location of V539 Arae (circled)
Constellation	Ara
Right ascension	17^h 50^m 28.39341^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−B color index	–0.64
B−V color 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 ± 0.47 mas^[1]
Distance	approx. 1,000 ly (approx. 300 pc)
Absolute magnitude (M_V)	–1.83/–1.11^[4]

Details
ν¹ Ara A
Mass	6.240 ± 0.066^[4] `M`_☉
Radius	4.516 ± 0.084^[4] `R`_☉
Luminosity	1,963^[4] `L`_☉
Surface gravity (log g)	3.924 ± 0.016^[4] cgs
Temperature	18,100 ± 500^[4] K
Rotational velocity (v sin i)	100^[3] km/s
Age	23.2 ± 2.9^[5] Myr
ν¹ Ara B
Mass	5.314 ± 0.060^[4] `M`_☉
Radius	3.428 ± 0.083^[4] `R`_☉
Luminosity	902^[4] `L`_☉
Surface gravity (log g)	4.093 ± 0.021^[4] cgs
Temperature	17,100 ± 500^[4] K
Rotational velocity (v sin i)	130^[3] km/s
Other designations
V539 Ara, CD−53° 7423, HD 161783, HIP 87314, HR 6622, SAO 245065.^[6]
Database references
SIMBAD	AB
	A