BX Boötis

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.[9] Based upon an annual parallax shift of 10.81 mas,[1] it is located 302 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.[7]

BX Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 15h 42m 50.760818s[1]
Declination +52° 21′ 39.2444″[1]
Apparent magnitude (V) 6.33 to 6.41[2]
Characteristics
Spectral type A0 Vsp SiSrCr[3] or B9 Vp SiCrSr[4]
B−V color index −0.099±0.004[5]
Variable type α2 CVn[6]
Astrometry
Radial velocity (Rv)−10.7±1.8[7] km/s
Proper motion (μ) RA: −66.214[1] mas/yr
Dec.: −29.308[1] mas/yr
Parallax (π)10.8059 ± 0.0811[1] mas
Distance302 ± 2 ly
(92.5 ± 0.7 pc)
Absolute magnitude (MV)0.21[5]
Details
Mass2.70±0.09[8] M☉
Radius2.51[9] R☉
Luminosity72.4+10.8
−12.1[8] L☉
Surface gravity (log g)4.50[10] cgs
Temperature9,164[10] K
Metallicity [Fe/H]+0.63[10] dex
Rotation2.88756 d[11]
Rotational velocity (v sin i)30[12] km/s
Age235[13] Myr
Other designations
BX Boo, BD+47° 2192, FK5 3247, HD 133029, HIP 73454, HR 5597, SAO 45326[14]
Database references
SIMBADdata

This is a magnetic CP star[11] with a stellar classification of A0 Vsp SiSrCr,[3] 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.[15] It is classified as an Alpha² Canum Venaticorum variable[6] with a magnitude that varies from 6.33 to 6.41[2] over a period of 2.88756 days.[11]

BX Boötis is 235[13] million years old with a projected rotational velocity of 30[12] km/s. It has 2.7[8] times the mass of the Sun and 2.5[9] times the Sun's radius. The star is radiating around 72[8] times the Sun's luminosity from its photosphere at an effective temperature of 9,164 K.[10]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. Watson, Christopher (January 4, 2010), "BX Boötis", AAVSO Website, American Association of Variable Star Observers, retrieved 5 August 2014.
  3. Abt, H. A.; Cardona, O. (1984), "The nature of the visual companions of AP and AM stars", Astrophysical Journal, 276: 266, Bibcode:1984ApJ...276..266A, doi:10.1086/161610.
  4. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  6. Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  7. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  8. Kochukhov, O.; Bagnulo, S. (2006), "Evolutionary state of magnetic chemically peculiar stars", Astronomy and Astrophysics, 450 (2): 763, arXiv:astro-ph/0601461, Bibcode:2006A&A...450..763K, doi:10.1051/0004-6361:20054596, S2CID 18596834.
  9. Shulyak, D.; et al. (September 2014), "Interferometry of chemically peculiar stars: theoretical predictions versus modern observing facilities", Monthly Notices of the Royal Astronomical Society, 443 (2): 1629–1642, arXiv:1406.6093, Bibcode:2014MNRAS.443.1629S, doi:10.1093/mnras/stu1259, S2CID 96452769.
  10. Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
  11. Adelman, Saul J. (June 2008), "FCAPT uvby Photometry of the mCP Stars HR 1297, 25 Sex, BX Boo, and 49 Her", Publications of the Astronomical Society of the Pacific, 120 (868): 595–601, Bibcode:2008PASP..120..595A, doi:10.1086/588680.
  12. Strom, Stephen E.; et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal, 129 (2): 809–828, arXiv:astro-ph/0410337, Bibcode:2005AJ....129..809S, doi:10.1086/426748, S2CID 15059129.
  13. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  14. "HD 46052". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 August 2018.
  15. López-García, Z.; Adelman, S. J. (June 1999), "Elemental abundance studies of CP stars. II. The silicon stars HD 133029 and HD 192913", Astronomy and Astrophysics Supplement, 137 (2): 227–232, Bibcode:1999A&AS..137..227L, doi:10.1051/aas:1999247.
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