BX Boötis

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Template:Short description

BX Boötis
File:BXBooLightCurve.png
The visual band light curve of BX Boötes, adapted from Adelman (2008)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.33 to 6.41[3]
Characteristics
Spectral type A0 Vsp SiSrCr[4] or B9 Vp SiCrSr[5]
B−V Template:Engvar Script error: No such module "val".[6]
Variable type α2 CVn[7]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[8] km/s
Proper motion (μ) RA: -8.999[2] mas/yr
Dec.: 15.852[2] mas/yr
Parallax (π)6.3665±0.0287 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.21[6]
Details
MassScript error: No such module "val".[9] Template:Solar mass
Radius2.51[10] Template:Solar radius
LuminosityScript error: No such module "val".[9] Template:Solar luminosity
Surface gravity (log g)4.50[11] cgs
Temperature9,164[11] K
Metallicity [Fe/H]+0.63[11] dex
Rotation2.88756 d[1]
Rotational velocity (v sin i)30[12] km/s
Age235[13] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[14]
Database references
SIMBADdata

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BX Boötis is a star in the northern constellation of Boötes. It is a dim star near the lower limit of visibility to the naked eye, having a nominal apparent visual magnitude of 6.35.[10] Based upon an annual parallax shift of Script error: No such module "val".,[2] it is located 512 light years away. At that distance, the visual magnitude of the star is diminished by an extinction of 0.13 due to interstellar dust.[13] It is moving closer with a heliocentric radial velocity of −11 km/s.[8]

The variability of BX Boötis was probably discovered by Gerhard Robert Miczaika. It was announced in a 1954 IAU publication, where he discusses photo-electric measurements of spectrum variables. He wrote "The magnetic-field variable HD 133129 is likewise variable in magnitude with a small amplitude."[15] HD 133129 is not BX Boötis, but HD 133029 is. Unlike BX Boötis, HD 133129 does not match Miczaika's description of the star. Kukarkin et al. apparently concluded there was a typographical error in Miczaika's announcement, because they cited Miczaika's 1954 announcement when they gave BX Boötis its variable star designation in 1972.[16]

This is a magnetic CP star[1] with a stellar classification of A0 Vsp SiSrCr,[4] indicating this is an A-type main-sequence star. The spectrum has very weak lines of helium but displays strong overabundances of silicon and all of the heavier elements except nickel.[17] It is classified as an Alpha² Canum Venaticorum variable[7] with a magnitude that varies from 6.33 to 6.41[3] over a period of 2.88756 days.[1]

BX Boötis is 235[13] million years old with a projected rotational velocity of 30[12] km/s. It has 2.7[9] times the mass of the Sun and 2.5[10] times the Sun's radius. The star is radiating around 72[9] times the Sun's luminosity from its photosphere at an effective temperature of 9,164 K.[11]

References

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  1. ↑ a b c d Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Template:Cite DR2
  3. ↑ a b Script error: No such module "citation/CS1".
  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 Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ a b c d Script error: No such module "citation/CS1".
  10. ↑ a b c Script error: No such module "citation/CS1".
  11. ↑ a b c d Script error: No such module "citation/CS1".
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ a b c Script error: No such module "citation/CS1".
  14. ↑ Template:Cite simbad
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Boötes

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