R Boötis

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R Boötis
File:RBooLightCurve.png
The visual band light curve of R Boötis, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.0 - 13.3[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M4-8e[5]
B−V Template:Engvar Script error: No such module "val".[6]
Variable type Mira variable[3][7]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[8] km/s
Proper motion (μ) RA: –25.537[2] mas/yr
Dec.: 11.968[2] mas/yr
Parallax (π)1.5204±0.0586 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
Mass1.492[9] Template:Solar mass
Radius241Template:Snd268[10] Template:Solar radius
LuminosityScript error: No such module "val".[10] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val". or Script error: No such module "val".[10] cgs
Temperature3,029Template:Snd3,061[10] K
Metallicity [Fe/H]+0.512[9] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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R Boötis is a variable star in the northern constellation of Boötes. The star's brightness varies tremendously, ranging from apparent magnitude 6.0, when it might be faintly visible to the naked eye under very good observing conditions, to 13.3, when a fairly large telescope would be required to see it.[3] The distance to this star is approximately Script error: No such module "val". based on parallax measurements.[2] It is drifting closer with a radial velocity of about −58 km/s.[8]

The variability of this star was discovered by German astronomer F. W. Argelander in 1857.[12] It is classified as a Mira-type pulsating variable that ranges in brightness from magnitude 6.0 down to 13.3 with a period of 223.11 days.[3][7] The stellar classification of the star ranges from M4e to M8e,[5] where the 'e' indicates emission features in the spectrum.

R Boötis is much larger and luminous than the Sun, at Script error: No such module "val". and a size 250 times that of the Sun. It has cooled to an effective temperature of Script error: No such module "val".,[10] giving it a reddish hue.[13]

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Template:Cite Gaia EDR3
  3. ↑ a b c d Script error: No such module "Citation/CS1".
  4. ↑ Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ a b 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". Database at VizieR. R Boötis = (Gaia DR3) 1279554668255201152.
  10. ↑ a b c d e 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".

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Template:Sky Template:Stars of Boötes

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