Lambda Arae

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Template:Short description

Lambda Arae
Template:Location mark
Location of λ Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.77[2]
Characteristics
Spectral type F4 V[3]
U−B Template:Engvar −0.04[2]
B−V Template:Engvar +0.40[2]
R−I Template:Engvar +0.22
Variable type 3.10[4]
Astrometry
Radial velocity (Rv)+3.3±0.3[5] km/s
Proper motion (μ) RA: +104.233 mas/yr[1]
Dec.: −175.956 mas/yr[1]
Parallax (π)47.7045±0.1368 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+3.06[6]
Details
Mass1.37±0.04[1] Template:Solar mass
Radius1.711±0.035[1] Template:Solar radius
Luminosity4.69Template:Su[1] Template:Solar luminosity
Surface gravity (log g)4.064Template:Su[1] cgs
Temperature6,495Template:Su[1] K
Metallicity [Fe/H]−0.24[4] dex
Rotational velocity (v sin i)15.5[7] km/s
Age2.44±0.39[1] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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Lambda Arae is a star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from λ Arae, and abbreviated Lambda Ara or λ Ara. The apparent visual magnitude of this star is 4.77,[2] making it bright enough to be seen with the naked eye. Based on parallax measurements, it is located at a distance of Template:Convert from Earth. This star is drifting further away from the Sun with a radial velocity of +3 km/s.[5]

The spectrum of this star matches a stellar classification of F4 V,[3] which places it among the category of F-type main sequence stars. It is an estimated 2.4 billion years old,[1] and is spinning with a projected rotational velocity of 15.5 km/s.[7] This star has 40% more mass than the Sun and a 70% greater radius. It shines with 4.7 times the luminosity of the Sun. The outer atmosphere is radiating this energy at an effective temperature of 6,495 K,[1] giving it the yellow-white hue of an F-type star. There is some evidence that this may be a binary star system consisting of two stars with identical masses.[7]

Examination of Lambda Arae with the Spitzer Space Telescope shows an excess of infrared emission at a wavelength of 70 μm. This suggests it may be orbited by a disk of dust at a radius of more than 15 astronomical units[9]

References

Template:Reflist

External links

Template:Stars of Ara

  1. ↑ a b c d e f g h i j k l Cite error: Invalid <ref> tag; no text was provided for refs named dr3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aj132_1_161
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa501_3_941
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov_2006
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named vonEiff2012
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named mnras415_2_1240
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj705_1_89
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