HD 125823

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HD 125823
File:V761CenLightCurve.png
A light curve V761 Centauri, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus[2]
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) +4.41[2]
Characteristics
Evolutionary stage main sequence[4]
Spectral type B2V[5]
U−B Template:Engvar −0.75[6]
B−V Template:Engvar −0.19[6]
Variable type SX Ari[7]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[8] km/s
Proper motion (μ) RA: Script error: No such module "val".[3] mas/yr
Dec.: Script error: No such module "val".[3] mas/yr
Parallax (π)7.13±0.16 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.27[9]
Details
MassScript error: No such module "val".[9] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
Luminosity1,175[9] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
Temperature17,700[9] K
Rotation8.817744 days[9][10]
Rotational velocity (v sin i)16.0[11] km/s
Age15.7[12] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[13]
Database references
SIMBADdata

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HD 125823, also known as V761 Centauri or a Centauri, is a variable star in the constellation Centaurus. It is a blue-white star that is visible to the naked eye with a mean apparent visual magnitude of +4.41. The distance to this star is approximately 460 light years based on parallax measurements.[3] It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.[14]

In 1965, W. P. Bidelman discovered that the intensities of the star's neutral helium lines had varied on photographic plates taken over the period 1908 to 1911. This variation was confirmed by A. D. Thackeray in 1966.[15] The star ranges from a helium-strong B2 class to a helium-weak B8 with a period of 8.82 days.[16] Radial velocity measurements during the 1970s showed differing velocity variations for helium and other elements.[17] The magnetic field strength peaks at a negative maximum in phase with the maximum helium line strength.[16] Weak emission has been detected in the singly-ionized lines of silicon, magnesium, and iron, but not in the neutral lines of hydrogen and helium.[16]

This is a magnetic peculiar Bp star that shows periodic variation in the strength of its neutral helium lines. It is classified as an SX Arietis type variable star and its brightness varies from magnitude +4.38 to +4.43 with a period of 8.82 days.[7] The star displays very different helium abundances between the two hemispheres, and, unusually, helium-3 has been detected in the weaker southern hemisphere. Latitudinal abundance concentrations have been found for iron, nitrogen, and oxygen.[10] The variation in helium concentration effects the density scale height of the atmosphere, causing helium rich regions to have a lower luminosity in the visual band but emitting stronger levels of far ultraviolet.[18]

References

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  1. ↑ Script error: No such module "citation/CS1".
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  3. ↑ a b c d e f Script error: No such module "Citation/CS1". Vizier catalog entry
  4. ↑ Template:Cite Gaia DR3
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  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c d e f g 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".
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  13. ↑ Template:Cite simbad
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ a b c Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Centaurus

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