Alpha Doradus

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Template:Short description

Alpha Doradus
Template:Location mark
Location of α Doradus (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
A
Right ascension Template:RA
Declination Template:DEC[1]
Apparent magnitude (V) 3.27[2]
B
Right ascension Template:RA
Declination Template:DEC[3]
Apparent magnitude (V) 4.3[2]
Characteristics
U−B Template:Engvar −0.35[2]
B−V Template:Engvar −0.10[2]
R−I Template:Engvar −0.09[2]
A
Spectral type A0IIIp[2]
Variable type ACV[4]
B
Spectral type B9IV[2]
Astrometry
A
Radial velocity (Rv)25.6 ± 0.9[5] km/s
Proper motion (μ) RA: 58.06[1] mas/yr
Dec.: 12.73[1] mas/yr
Parallax (π)19.34±0.31 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
B
Proper motion (μ) RA: 42.83[3] mas/yr
Dec.: 12.94[3] mas/yr
Orbit[7]
Period (P)12.1 y
Semi-major axis (a)0.18″
Eccentricity (e)0.80
Inclination (i)31°
Longitude of the node (Ω)140°
Periastron epoch (T)B1986
Argument of periastron (ω)
(secondary)		193°
Details
A
Mass3.33 ± 0.10[8] Template:Solar mass
Radius3.5 ± 0.3[8] Template:Solar radius
Luminosity (bolometric)195[8] Template:Solar luminosity
Surface gravity (log g)4.02 ± 0.07[8] cgs
Temperature11,588[8] K
Rotation2.94 days[8]
B
Mass2.7[9] Template:Solar mass
Radius1.9[9] Template:Solar radius
Luminosity (bolometric)70[9] Template:Solar luminosity
Temperature12,200[9] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[5]
Database references
SIMBADdata

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Alpha Doradus, Latinized from α Doradus, is the brightest star in the southern constellation of Dorado. The distance to this system, as measured using the parallax method, is about Script error: No such module "convert"..[6]

File:AlphaDorLightCurve.png
A light curve for Alpha Doradus, plotted from TESS data[10][11]

This is a binary star system[9] with an overall apparent visual magnitude that varies between 3.26 and 3.30,[4] making this one of the brightest binary stars.[12] The system consists of a subgiant star of spectral type B revolving around a giant star with spectral type A in an eccentric orbit with a period of about 12 years.[2][7] The orbital separation varies from 2 astronomical units at periastron to 17.5 astronomical units at apastron. The primary, α Doradus A, is a chemically peculiar star whose atmosphere displays an abnormally high abundance of silicon, making this an Si star.[8]

Alpha Doradus has an optical companion, CCDM J04340-5503C, located 77 arcseconds away along a position angle of 94°. It has no physical relation to the other two stars.[2][13]

References

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  1. ↑ a b c HIP 21281, record for component 1, Hipparcos catalogue; CDS ID I/239.
  2. ↑ a b c d e f g h i HR 1465, 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 3, 2008.
  3. ↑ a b c HIP 21281, record for component 2, Hipparcos catalogue; CDS ID I/239.
  4. ↑ a b alf Dor, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Template:Webarchive, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.
  5. ↑ a b V* alf Dor -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ a b c d e f g Script error: No such module "citation/CS1".
  9. ↑ a b c d e Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Dorado

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