R Leporis

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Template:Short description

R Leporis
File:R Leporis.png
Location of R Leporis in the constellation Lepus.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.5 to 11.7[2]
Characteristics
Spectral type C7,6e(N6e)[2]
B−V Template:Engvar +5.74[3]
R−I Template:Engvar +1.47[3]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)32.4 ± 2[1] km/s
Proper motion (μ) RA: 6.798 mas/yr[4]
Dec.: −1.263 mas/yr[4]
Parallax (π)2.1914±0.0602 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
Mass1.00[5]Template:Snd1.49[6] Template:Solar mass
RadiusTemplate:Solar radius calculatorTemplate:SndTemplate:Solar radius calculator[7]Template:Efn Template:Solar radius
Luminosity13,200[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[6] cgs
Temperature2,290[9] K
Metallicity [Fe/H]Script error: No such module "val".[6] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[1]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

R Leporis (R Lep), sometimes called Hind's Crimson Star,[10] is a well-known variable star in the constellation Lepus, near its border with Eridanus.

It is a carbon star which appears distinctly red. It is named after famous British astronomer J. R. Hind, who observed it in 1845. Its apparent magnitude varies from +5.5 to +11.7 with a period of 418–441 days; recent measurements give a period of 427.07 days. There may be a secondary period of 40 years.[3] Guandalini and Cristallo calculated the luminosity of Mira variables based on their periods. Using a period of 427.07 days, they calculated the bolometric luminosity to be Template:Solar luminosity.[8]

R Leporis has often been reported as having an intense smoky red color, although this is not pronounced when the star is near its maximum brightness. It is reddest when it is dimmest, which occurs every 14.5 months. During these periods it is a candidate for the most-visible reddest star, but this claim is questionable. The red coloration may be caused by carbon in the star's outer atmosphere filtering out the blue part of its visible light spectrum. The star's discoverer, Hind, reported that it appeared "like a drop of blood on a black field."[10]

Notes

Template:Notelist

References

  1. ↑ a b c d Template:Cite simbad
  2. ↑ a b c R Lep, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Script error: No such module "webarchive"., Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 19, 2009.
  3. ↑ a b c HR 1607, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 19, 2009.
  4. ↑ a b Template:Cite DR3
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ a b c Script error: No such module "Citation/CS1". Database at VizieR.
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

External links

Template:Stars of Lepus

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