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[1] mas |
| Distance | 70.0 ± 0.5 ly (21.5 ± 0.2 pc) |
| Details | |
| Luminosity | 4.6[5] L☉ |
| Surface gravity (log g) | 4.15[5] cgs |
| Temperature | 6,725[5] K |
| Metallicity [Fe/H] | –0.24[4] dex |
| Rotational velocity (v sin i) | 15.5[6] km/s |
| Other designations | |
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.
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,[5] 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.[6]
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[8]
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
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