Beta Doradus

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Template:Short description

β Doradus
Template:Location mark
Location of β Doradus (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.46 to 4.08[2]
Characteristics
Spectral type F4-G4Ia-II[3]
U−B Template:Engvar +0.55[3]
B−V Template:Engvar +0.70[4]
R−I Template:Engvar +0.48[4]
Variable type δ Cephei[2]
Astrometry
Radial velocity (Rv)+7.2[5] km/s
Proper motion (μ) RA: +0.800[1] mas/yr
Dec.: +9.458[1] mas/yr
Parallax (π)3.14±0.16 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val".[7]
Details
MassScript error: No such module "val".[8] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
Luminosity3,200[7] Template:Solar luminosity
Surface gravity (log g)1.3[10] cgs
Temperature5,445[7] K
Metallicity [Fe/H]–0.13[10] dex
Rotational velocity (v sin i)0[3] 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 Doradus, Latinized from β Doradus, is the second brightest star in the southern constellation of Dorado.[12] It is a Classical Cepheid variable, with an apparent magnitude that varies between 3.46 and 4.08.[2] Based upon parallax measurements with the Hubble Space Telescope, it is located at a distance of Script error: No such module "convert". from Earth.[6]

Characteristics

File:BetaDorLightCurve.png
A light curve for Beta Doradus, plotted from TESS data[13]

Beta Doradus is a Cepheid variable that regularly changes magnitude from a low of 4.08 to a high of 3.46[2] over a period of 9.84318 days.[14] The light curve of this magnitude change follows a nearly regular saw-tooth pattern, with average amplitude variations period to period about 0.005 magnitude from average amplitude of 0.62 magnitude.[14] During each radial pulsation cycle, the radius of the star varies by Template:Solar radius around a mean of Template:Solar radius.[9] Its spectral type and luminosity class are likewise variable, from F-type to G-type and from a supergiant to a bright giant.[3]

Far ultraviolet emissions have been detected from this star with the Far Ultraviolet Spectroscopic Explorer, while X-ray emissions were detected with the XMM-Newton space telescope. The X-ray luminosity is about 1 × 1029 erg/s and the emission varies with the pulsation period, suggesting a connection with the pulsation process. The peak X-ray emissions are in the 0.6–0.8 keV energy range, which occurs for plasmas with temperatures of 7–10 million K.[15]

References

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  1. ↑ a b c d Template:Cite Gaia DR2
  2. ↑ a b c d bet 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 9, 2008.
  3. ↑ a b c d HR 1922, 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 9, 2008.
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b c Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ a b 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. ↑ a b Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Dorado Template:Sky

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