V539 Arae

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V539 Arae
Template:Location mark
The location of V539 Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.62[3]
Characteristics
Spectral type B2 V + B3 V + A1 V[3]
U−B Template:Engvar −0.64Script error: No such module "Unsubst".
B−V Template:Engvar −0.099±0.017[1]
Variable type Algol/SPB[4]
Astrometry
Radial velocity (Rv)−4.3±2.9[5] km/s
Proper motion (μ) RA: +2.517 mas/yr[2]
Dec.: −12.105 mas/yr[2]
Parallax (π)2.5208±0.1096 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.83/−1.11[6]
Orbit[7]
Period (P)Template:Val
Eccentricity (e)Template:Val
Inclination (i)85.2°
Argument of periastron (ω)
(secondary)		Template:Val°
Details[8]
V539 Ara A
Mass6.239±0.066 Template:Solar mass
Radius4.551±0.019 Template:Solar radius
Luminosity2,000Template:Su Template:Solar luminosity
Surface gravity (log g)3.9170±0.0029 cgs
Temperature18,100±500[6] K
Rotational velocity (v sin i)100[9] km/s
Age23.2±2.9[10] Myr
V539 Ara B
Mass5.313±0.060 Template:Solar mass
Radius3.575±0.035 Template:Solar radius
Luminosity980Template:Su Template:Solar luminosity
Surface gravity (log g)4.0570±0.0084 cgs
Temperature17,100±500[6] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)130[9] km/s
Other designations
Template:Odlist[11]
Database references
SIMBADAB
A

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V539 Arae is a multiple star system in the southern constellation of Ara. It has the Bayer designation Nu1 Arae , which is Latinized from ν1 Arae and abbreviated Nu1 Ara or ν1 Ara. This is a variable star system, the brightness of which varies from magnitude 5.71 to 6.24, making it faintly visible to the naked eye under good observing conditions.[12] Based upon an annual parallax shift of Template:Val,[2] this system is at a distance of approximately Template:Convert from Earth. The system is drifting closer to the Sun with a radial velocity of −4 km/s.[5]

File:V539AraLightCurve.png
A visual band light curve for V539 Arae, adapted from Knipe (1971)[13]

In 1930, Ferdinand Johannes Neubauer found that the star (usually called Boss 4496 at the time) is a spectroscopic binary. He did not detect any brightness variability.[14] Eclipses were first reported by E. Schoeffel and U. Kohler in 1965. The period they reported is 1/2 the currently accepted value, because they did not realize that the light curve has a deep secondary minimum.[15][16] In 1996, the secondary component was found to be a slowly pulsating B-type star (SPB) with periods of periods of 1.36, 1.78 and possibly 1.08 days.[17]

The core members of this system, ν1 Ara AB, consist of a pair of B-type main-sequence stars in a detached orbit with a period of 3.169 days and an eccentricity of 0.055.[7] 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.[11] The eclipse of the primary causes a decrease of 0.52 in magnitude, while the secondary eclipse decreases the magnitude by 0.43.[18]

At an angular separation of 12.34 arcseconds, is a possible tertiary component of this system; a magnitude 9.40 A-type main-sequence star with a classification of A1 V.[3] A 2005 study of the orbit of the main pair demonstrated an apsidal motion, suggesting the influence of a third body. The initial estimate found an orbital period of Template:Val and a mass of Template:Val.[7] In 2022, a more refined study suggested the influence of two stellar objects with masses of Template:Val and Template:Val.[19]

The system is sometimes referred as Upsilon1 Arae (υ1 Arae), and more generally unlettered.[20]

References

Template:Reflist

External links

Template:Stars of Ara

  1. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Samus_et_al_2017
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov_2006
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aar18_1_2
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Wolf_Zejda_2005
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named southworth2022
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named gcrv1953
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras410_1_190
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named GCVS
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Knipe
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Neubauer
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Schoeffel
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Thackeray
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Clausen_1996
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa446_2_785
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Wolf_et_al_2022
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named bsc
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