Star in the constellation Ara
Lambda Arae
Location of λ Arae (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Ara
Right ascension 17h 40m 23.826s [ 1]
Declination
−49° 24′ 56.10″[ 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 )+3.3± 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] Distance 68.4 ± 0.2 ly pc ) Absolute magnitude (MV )+3.06[ 6] Details Mass 1.37± 0.04[ 1] M ☉ Radius 1.711± 0.035[ 1] R ☉ Luminosity 4.69+0.03 −0.05 [ 1] L ☉ Surface gravity (log g )4.064+0.005 −0.003 [ 1] cgs Temperature 6,495+3 −7 [ 1] K Metallicity [Fe/H] −0.24[ 4] dex Rotational velocity (v sin i )15.5[ 7] Age 2.44± 0.39[ 1] Gyr Other designations λ Ara, λ Arae , NSV 23218CD −49°11616GC 23918GJ 686.2GJ 9597 , HD 160032HIP 86486HR 6569SAO 228257PPM 323240NLTT 45187[ 8] Database references SIMBAD data
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] naked eye . Based on parallax measurements, it is located at a distance of 68 light-years (21 parsecs ) 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] F-type main sequence stars . It is an estimated 2.4 billion years old,[ 1] projected rotational velocity of 15.5 km/s.[ 7] outer atmosphere is radiating this energy at an effective temperature of 6,495 K,[ 1] 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
^ a b c d e f g h i j k l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J . ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161– 170, arXiv :astro-ph/0603770 Bibcode :2006AJ....132..161G , doi :10.1086/504637 , S2CID 119476992 . ^ a b Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics , 501 (3): 941– 947, arXiv :0811.3982 Bibcode :2009A&A...501..941H , doi :10.1051/0004-6361/200811191 , S2CID 118577511 . ^ a b Gontcharov, G. A. (2006), "Pulkovo compilation of radial velocities for 35495 stars in a common system", Astronomy Letters 32 (11): 759– 771, arXiv :1606.08053 Bibcode :2006AstL...32..759G , doi :10.1134/S1063773706110065 , S2CID 119231169 . ^ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics , 542 : A116, arXiv :1204.2459 Bibcode :2012A&A...542A.116A , doi :10.1051/0004-6361/201118724 , S2CID 53666672 . ^ a b c Fuhrmann, K.; et al. (August 2011), "Evidence for the nearby F4V star λ Ara as a binary system", Monthly Notices of the Royal Astronomical Society 415 (2): 1240– 1243, Bibcode :2011MNRAS.415.1240F , doi :10.1111/j.1365-2966.2011.18764.x ^ "lam Ara" , SIMBAD Centre de données astronomiques de Strasbourg , retrieved 2010-07-30 .^ Lawler, S. M.; et al. (November 2009), "Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars", The Astrophysical Journal , 705 (1): 89– 111, arXiv :0909.0058 Bibcode :2009ApJ...705...89L , doi :10.1088/0004-637X/705/1/89 , S2CID 1272803 .
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