Beta Chamaeleontis

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Template:Short description

Beta Chamaeleontis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.24[2] (4.24 to 4.30)[3]
Characteristics
Spectral type B4 V[4]
U−B Template:Engvar −0.52[2]
B−V Template:Engvar −0.13[2]
R−I Template:Engvar −0.10[5]
Astrometry
Radial velocity (Rv)+23.0[6] km/s
Proper motion (μ) RA: −37.97[1] mas/yr
Dec.: +11.15[1] mas/yr
Parallax (π)10.93±0.15 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.57[7]
Details
MassScript error: No such module "val".[8] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
Luminosity212[10] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
TemperatureScript error: No such module "val".[9] K
Rotational velocity (v sin i)255[5] km/s
AgeScript error: No such module "val".[8] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Beta Chamaeleontis, Latinized from β Chamaeleontis, is the third-brightest star in the southern constellation of Chamaeleon. A solitary,[12] suspected variable star, it is visible to the naked eye as a faint blue-white point of light with an apparent visual magnitude that has been measured ranging between 4.24 and 4.30.[3] Parallax measurements yield a distance estimate of 298 light years from the Sun, and it is drifting further away with a radial velocity of +23 km/s.[6]

This is a B-type main-sequence star with a stellar classification of B4 V[4] that is generating energy through core hydrogen fusion. It has been catalogued both as a Be star[2] and a normal star.[13] This object is about 23[8] million years old with a high projected rotational velocity of 255 km/s.[5] The rapid rotation is creating an equatorial bulge that is 12% larger than the polar radius.[14] The star has five[8] times the mass of the Sun and 2.8[9] times the Sun's radius. It is radiating 212[10] times the luminosity of the Sun from its photosphere at an effective temperature of 14,495 K.[9]

References

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  1. ↑ a b c d e Script error: No such module "citation/CS1".
  2. ↑ a b c d 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 HR 4674, 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 September 5, 2008.
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b c d Script error: No such module "citation/CS1".
  9. ↑ a b c d e Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  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".

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Template:Stars of Chamaeleon

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