Alpha Leporis

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α Leporis
Lepus constellation map.svg
Red circle.svg
Location of α Leporis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Lepus
Right ascension 05h 32m 43.81612s [1]
Declination 17° 49 20.2414 [1]
Apparent magnitude  (V)2.589 [2]
Characteristics
Evolutionary stage Blue loop (yellow supergiant) [3]
Spectral type F0 Ib [4]
U−B color index +0.386 [2]
B−V color index +0.2 [5]
Astrometry
Radial velocity (Rv)+23.9 [6]  km/s
Proper motion (μ)RA: +3.56 [1]   mas/yr
Dec.: +1.18 [1]   mas/yr
Parallax (π)1.47 ± 0.14  mas [1]
Distance 2,200 ± 200  ly
(680 ± 60  pc) [1]
Absolute magnitude  (MV)-5.7 [7]
Details
Mass 13.9±0.8 [8]   M
Radius 129 [9]   R
Luminosity 30,502±3,111 [10]   L
Surface gravity (log g)1.34±0.07 [8]   cgs
Temperature 7,253 or 7,290 [11]   K
Metallicity [Fe/H]+0.01–0.06 [11]   dex
Rotational velocity (v sin i)13–21 [5]  km/s
Age 13 [8]   Myr
Other designations
Arneb, 11  Leporis, BD−17°1166, FK5  207, HD  36673, HIP  25985, HR  1865, SAO  150547
Database references
SIMBAD data

Alpha Leporis (α Leporis, abbreviated Alpha Lep, α Lep), formally named Arneb /ˈɑːrnɛb/ , [12] [13] is the brightest star in the constellation of Lepus.

Contents

Nomenclature

Alpha Leporis is the star's Bayer designation. The traditional name Arneb comes from the Arabic أرنب’arnab 'hare' [14] ('Lepus' is Latin for hare). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [15] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 [16] included a table of the first two batches of names approved by the WGSN; which included Arneb for this star.

In Chinese, (), meaning Toilet , refers to an asterism consisting of α Leporis, β Leporis, γ Leporis and δ Leporis. [17] Consequently, the Chinese name for α Leporis itself is 廁一 (Cè yī), "the First Star of Toilet". [18]

Properties

This is a massive star with about 14 times the mass of the Sun. [8] The interferometer-measured angular diameter of this star, after correction for limb darkening, is 1.77 ± 0.09 mas . [19] At an estimated distance of 2,218 light-years (680 parsecs ), [1] this yields a physical size of about 129 times the radius of the Sun. [9] Alpha Leporis has a stellar classification of F0 Ib, [4] with the Ib luminosity class indicating that it is a lower luminosity yellow supergiant star. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. [20] The effective temperature of the outer envelope is about 7,300  K, [11] which gives the star a yellowish-white hue that is typical of F-type stars. [21] It is an estimated 13 million years old. [8]

Arneb is an older, dying star that has already passed through a red supergiant phase and is now contracting and heating up in the latter phases of stellar evolution, in a blue loop. [3]

Namesakes

USS Arneb (AKA-56) was a ship of the United States Navy.

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References

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