V539 Arae

V539 Arae (Bayer designation Nu1 Arae1 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.

V539 Arae
The location of V539 Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension  17h 50m 28.39341s[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 (Rv)-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[1] mas
Distanceapprox. 1,000 ly
(approx. 300 pc)
Absolute magnitude (MV)–1.83/–1.11[4]
Details
ν1 Ara A
Mass6.240 ± 0.066[4] M
Radius4.516 ± 0.084[4] R
Luminosity1,963[4] L
Surface gravity (log g)3.924 ± 0.016[4] cgs
Temperature18100 ± 500[4] K
Rotational velocity (v sin i)100[3] km/s
Age23.2 ± 2.9[5] Myr
ν1 Ara B
Mass5.314 ± 0.060[4] M
Radius3.428 ± 0.083[4] R
Luminosity902[4] L
Surface gravity (log g)4.093 ± 0.021[4] cgs
Temperature17100 ± 500[4] K
Rotational velocity (v sin i)130[3] km/s
Other designations
V539 Ara, CD53° 7423, HD 161783, HIP 87314, HR 6622, SAO 245065.[6]
Database references
SIMBADAB
A

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.[7] 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 Arae1 Arae), and more generally unlettered.[8]

References

  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.
  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.
  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.
  4. 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.
  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.
  6. "V* V539 Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-07-31.
  7. 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.
  8. Note for HR 6622: Hoffleit, D., Warren, Jr., W. H., (1991). The Bright Star Catalogue, (5th Revised Ed).
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