HD 111968

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Template:Short description Template:About-distinguish

n Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.25[2]
Characteristics
Spectral type A7IV[3] or A7V[4]
B−V Template:Engvar Script error: No such module "val".[2]
Astrometry
Proper motion (μ) RA: Script error: No such module "val".[1] mas/yr
Dec.: Script error: No such module "val".[1] mas/yr
Parallax (π)21.95±0.19 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.86[5]
Orbit[6]
PrimaryA
CompanionB
Period (P)80 years
Semi-major axis (a)Script error: No such module "val".
Details
A
Mass2.07[6] Template:Solar mass
Radius3.3[6] Template:Solar radius
Luminosity34.34[2] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[7] cgs
TemperatureScript error: No such module "val".[6] K
Rotational velocity (v sin i)Script error: No such module "val".[5] km/s
Age900[6] Myr
B
Mass0.88[6] Template:Solar mass
Radius0.80[6] Template:Solar radius
Temperature5,300[6] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age900[6] Myr
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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HD 111968, also known by the Bayer designation n Centauri, is a binary star[6] in the southern constellation of Centaurus. It is a white-hued star that is faintly visible to the naked eye with an apparent visual magnitude of +4.25.[2] The star is located at a distance of approximately 149 light years based on parallax.[1] The radial velocity of the star is poorly constrained, with an estimated value of 2.5 km/s.[2]

The primary component is classified as an A-type star but there has been disagreement about the luminosity class. A. de Vaucouleurs in 1957 found a class of III, suggesting this is an evolved giant star.[9] O. J. Eggen gave a class of V in 1962,[10] as did R. O. Gray and R. F. Garrison in 1989,[4] indicating this is a main sequence star. In 1979, N. Houk found a class of IV,[3] meaning this is a subgiant star. It is a young star, some 900 million years old, with 2.07 times the mass of the Sun.[6] It is spinning with a projected rotational velocity of 92 km/s.[5] The star is 3.3 times larger than the Sun,[6] radiating 34[2] times the luminosity of the Sun from its photosphere at an effective temperature of 7,400 K.[6]

The secondary component is a K-type dwarf, still in the main sequence. It has 88% of the mass and 80% of the radius of the Sun, with an effective temperature of Script error: No such module "val".. It is separated by 26 astronomical units from the primary, taking 80 years to complete an orbit around the system's center of mass. It is likely responsible for the X-ray emission coming from the system.[6]

Once the primary component start to evolve, it will lose mass, becoming a white dwarf with a mass of Template:Solar mass, and the orbital distance will be two times wider.[6]

References

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  1. ↑ a b c d e f Script error: No such module "citation/CS1". Vizier catalog entry
  2. ↑ a b c d e f 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 Script error: No such module "citation/CS1".
  6. ↑ a b c d e f g h i j k l m n o Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Template:Cite simbad
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Centaurus

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