Lambda Arietis

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Template:Short description

λ Arietis
Template:Location mark
Location of λ Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.79[3] (4.95/7.75)[4]
Characteristics
Spectral type F0 V + G1 V[4]
U−B Template:Engvar +0.09[3]
B−V Template:Engvar +0.290[1]
R−I Template:Engvar +0.16[5]
Astrometry
λ Ari A
Radial velocity (Rv)−1.4[6] km/s
Proper motion (μ) RA: −92.295 mas/yr[2]
Dec.: −13.207 mas/yr[2]
Parallax (π)24.7748±0.2189 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)1.81[1]
λ Ari B
Radial velocity (Rv)−8[6] km/s
Proper motion (μ) RA: −91.839 mas/yr[7]
Dec.: −19.370 mas/yr[7]
Parallax (π)24.8689±0.0446 mas[7]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
λ Ari A
Mass1.65±0.27[7] Template:Solar mass
Radius2.45±0.09[7] Template:Solar radius
Luminosity15.43±0.66[7] Template:Solar luminosity
Surface gravity (log g)3.88±0.08[7] cgs
Temperature7,311±125[7] K
Metallicity [Fe/H]+0.01[8] dex
Rotational velocity (v sin i)107[9] km/s
Age618[10] Myr
λ Ari B
Mass1.13±0.15[7] Template:Solar mass
Radius1.14±0.06[7] Template:Solar radius
Luminosity1.60±0.05[7] Template:Solar luminosity
Surface gravity (log g)4.37±0.08[7] cgs
Temperature6,072±130[7] K
Metallicity [Fe/H]−0.03[8] dex
Other designations
Template:Odlist
λ Ari A: Template:Odlist[11]
λ Ari B: Template:Odlist[12]
Database references
SIMBADdata

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Lambda Arietis is a double star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from λ Arietis, and abbreviated Lambda Ari or λ Ari. Based upon an annual parallax shift of 25.32 arcseconds, this system is approximately Template:Convert distant from Earth. The pair have a combined apparent visual magnitude of 4.79,[3] which is bright enough to be viewed with the naked eye. Because the yellow secondary is nearly three magnitudes fainter than the white primary, they are a challenge to split with quality 7× binoculars but are readily resolvable at 10×.[13]

The brighter component is an F-type main sequence star with a visual magnitude of 4.95 and a stellar classification of F0 V.[4] It is an estimated 618[10] million years old with a high rate of rotation, showing a projected rotational velocity of 107 km/s.[9] This star has 1.7 times the mass of the Sun and 2.5 times the Sun's radius. It is radiating 15 times the luminosity of the Sun from its photosphere at an effective temperature of 7,311 K.[7]

At an angular separation of 37.4 arcseconds is fainter, magnitude 7.75 companion. This is a G-type main sequence star with a classification of G1 V.[4] The star is at a similar distance as the brighter component, and has a comparable proper motion.[7] In 1988, Helmut Abt listed this as a physical pair, showing a common proper motion with a projected separation of Template:Val.[14]

References

Template:Reflist

References

Template:Stars of Aries

  1. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Anderson_Francis_2012
  2. ↑ a b c d 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 clpl4_99
  4. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mallama2014
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named gcsrv
  7. ↑ a b c d e f g h i j k l m n Cite error: Invalid <ref> tag; no text was provided for refs named Stassun_et_al_2019
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa515_A11
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa463_2_671
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named David_Hillenbrand_2015
  11. ↑ 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 SIMBAD_B
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named harrington2010
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Abt_1988
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