Epsilon Leonis

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Template:Short description

Epsilon Leonis
Template:Location mark
Location of ε Leonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 2.98[2]
Characteristics
Spectral type G1 II[3]
U−B Template:Engvar +0.47[2]
B−V Template:Engvar +0.808[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)4.86 ± 0.33[4] km/s
Proper motion (μ) RA: –45.61[1] mas/yr
Dec.: –9.21[1] mas/yr
Parallax (π)13.22±0.15 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)–1.49[6]
Details
MassTemplate:Val[7] Template:Solar mass
RadiusTemplate:Val[7] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
Surface gravity (log g)Template:Val[8] cgs
TemperatureTemplate:Val[8] K
Metallicity [Fe/H]Template:Val[8] dex
Rotational velocity (v sin i)8.1[4] km/s
AgeTemplate:Val[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Algenubi, Ras Elased Australis,[9] ε Leo, 17 Leo, BD+24°2129, FK5 367, GC 13443, HD 84441, HIP 47908, HR 3873, SAO 81004
Database references
SIMBADdata

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Epsilon Leonis (ε Leo, ε Leonis) is the fifth-brightest star in the constellation Leo, consistent with its Bayer designation Epsilon. It is known as Algenubi or Ras Elased Australis. Both names mean "the southern star of the lion's head". Australis is Latin for "southern" and Genubi is Arabic for "south".

Properties

Epsilon Leonis has a stellar classification of G1 II, with the luminosity class of II indicating that, it has evolved into a bright giant. It is much larger and brighter than the Sun with a luminosity 282[8] times and a radius 21 times solar.[7] Consequently, its absolute magnitude is actually –1.49,[6] making it one of the more luminous stars in the constellation, significantly more than Regulus. Its apparent brightness, though, is only 2.98.[2] Given its distance of about Template:Convert, the star is more than three times the distance from the Sun than Regulus. At this distance, the visual magnitude of Epsilon Leonis is reduced by 0.03 as a result of extinction caused by intervening gas and dust.[6]

Epsilon Leonis exhibits the characteristics of a Cepheid-like variable, changing by an amplitude of 0.3 magnitude every few days.[10][9] It has around four times the mass of the Sun and a projected rotational velocity of 8.1 km s−1.[4] Based upon its iron abundance, the metallicity of this star's outer atmosphere is only around 52% of the Sun's. That is, the abundance of elements other than hydrogen and helium is about half that in the Sun.[4]

See also

References

Template:Reflist

Template:Stars of Leo

External Links

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  4. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named aj135_1_209
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named pasj60_4_781
  7. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Baines2018
  8. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Soubiran2024
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named kaler
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named an319_4_239
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