Omega Virginis

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Template:Short description

ω Virginis
Template:Location mark
Location of ω Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.23 - 5.50[2][3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M4 III[5]
U−B Template:Engvar +1.63[6]
B−V Template:Engvar +1.60[6]
Variable type LB[2] or SR[3]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[7] km/s
Proper motion (μ) RA: −3.89[1] mas/yr
Dec.: +5.30[1] mas/yr
Parallax (π)6.56±0.36 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.2[8]
Details
Mass1.55[9] Template:Solar mass
Radius109[10] Template:Solar radius
Luminosity1,470[10] Template:Solar luminosity
Surface gravity (log g)0.8[8] cgs
Temperature3,433[10] K
Metallicity [Fe/H]−0.08[8] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
ω Vir, 1 Virginis, BD+08°2532, FK5 2932, HD 101153, HIP 56779, HR 4483, SAO 118965[11]
Database references
SIMBADdata

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Omega Virginis (ω Vir, ω Virginis) is a solitary[5] star in the zodiac constellation Virgo. It has an apparent visual magnitude of +5.2,[5] which is bright enough to be faintly visible to the naked eye. Based upon an annual stellar parallax shift of 6.56 milliarcseconds,[1] it is located about 500 light years from the Sun.

File:OmegaVirLightCurve.png
A light curve for Omega Virginis, plotted from Hipparcos data[12]

This is a red giant star with a stellar classification of M4 III.[5] It is thought to be on the asymptotic giant branch (AGB), with shells of hydrogen and helium around a carbon-oxygen core.[4] After evolving away from the main sequence it has expanded to around 109 times the solar radius, and now shines with 1,470 times the luminosity of the Sun. The effective temperature of the photosphere is 3,433 K.[10]

Omega Virginis is a semiregular variable with a brightness that varies over an amplitude of 0.28 with periods of 30 and 275 days.[13] The General Catalogue of Variable Stars gives the magnitude range as 5.23 to 5.50.[2] It was formally declared a variable star in 1972 following a 1969 study showing small-amplitude variations.[14][15]

References

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  1. ↑ a b c d e f Script error: No such module "citation/CS1".
  2. ↑ a b c Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b c d Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b c Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ a b c d Script error: No such module "citation/CS1". Omega Virginis' database entry at VizieR.
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".

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Template:Virgo

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