Lambda Arae (λ Ara, λ Arae) is the Bayer designation for a star in the southern constellation of Ara. It is at a distance of 70.0 light-years (21.5 parsecs) from Earth.[1] The apparent visual magnitude of this star is 4.77,[2] making it bright enough to be seen with the naked eye.

Lambda Arae

Location of λ Arae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Ara
Right ascension	17h 40m 23.82481s[1]
Declination	–49° 24′ 56.1015″[1]
Apparent magnitude (V)	4.77[2]
Characteristics
Spectral type	F4 V[3]
U−B color index	–0.04[2]
B−V color index	+0.40[2]
R−I color index	0.22
Variable type	3.10[4]
Astrometry
Radial velocity (Rv)	+3.6[4] km/s
Proper motion (μ)	RA: +103.22[1] mas/yr Dec.: –176.51[1] mas/yr
Parallax (π)	46.62 ± 0.33 mas[1]
Distance	70.0 ± 0.5 ly (21.5 ± 0.2 pc)
Absolute magnitude (MV)	+3.06[5]
Details
Luminosity	4.6[6] L☉
Surface gravity (log g)	4.15[6] cgs
Temperature	6,725[6] K
Metallicity [Fe/H]	–0.24[4] dex
Rotational velocity (v sin i)	15.5[7] km/s
Other designations
CD –49° 11616, GJ 9597, HD 160032, HIP 86486, HR 6569, NSV 23218, NLTT 45187, SAO 228257.[8]
Database references
SIMBAD	data

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 shines with 4.6 times the luminosity of the Sun. The outer atmosphere is radiating this energy at an effective temperature of 6,725 K,[6] 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

External links

• HR 6569
• Image Lambda Arae

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