 The visual band light curve of BX Boötes, adapted from Adelman (2008) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15 00 38.7179 |
| Declination | +47° 16′ 38.792″ |
| Apparent magnitude (V) | 6.33 to 6.41 |
| Characteristics | |
| Spectral type | A0 Vsp SiSrCr or B9 Vp SiCrSr |
| B−V color index | −0.099±0.004 |
| Variable type | α CVn |
| Astrometry | |
| Radial velocity (Rv) | −10.7±1.8 km/s |
| Proper motion (μ) | RA: -8.999 mas/yr Dec.: 15.852 mas/yr |
| Parallax (π) | 6.3665 ± 0.0287 mas |
| Distance | 512 ± 2 ly (157.1 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.21 |
| Details | |
| Mass | 2.70±0.09 M☉ |
| Radius | 2.51 R☉ |
| Luminosity | 72.4+10.8 −12.1 L☉ |
| Surface gravity (log g) | 4.50 cgs |
| Temperature | 9,164 K |
| Metallicity | +0.63 dex |
| Rotation | 2.88756 d |
| Rotational velocity (v sin i) | 30 km/s |
| Age | 235 Myr |
| Other designations | |
| BX Boo, BD+47° 2192, FK5 3247, HD 133029, HIP 73454, HR 5597, SAO 45326 | |
| Database references | |
| SIMBAD | data |
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. Based upon an annual parallax shift of 6.3665 mas, 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. It is moving closer with a heliocentric radial velocity of −11 km/s.
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." 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.
This is a magnetic CP star with a stellar classification of A0 Vsp SiSrCr, 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. It is classified as an Alpha² Canum Venaticorum variable with a magnitude that varies from 6.33 to 6.41 over a period of 2.88756 days.
BX Boötis is 235 million years old with a projected rotational velocity of 30 km/s. It has 2.7 times the mass of the Sun and 2.5 times the Sun's radius. The star is radiating around 72 times the Sun's luminosity from its photosphere at an effective temperature of 9,164 K.
References
- ^ 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, S2CID 122107251.
- ^ 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.
- ^ Watson, Christopher (January 4, 2010), "BX Boötis", AAVSO Website, American Association of Variable Star Observers, retrieved 5 August 2014.
- ^ 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.
- 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- "HD 46052". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 August 2018.
- Miczaika, G. R. (September 1954). "Photometric Measurements of Magnetic-Field and Spectrum Variables" (PDF). Transactions of the International Astronomical Union. 8: 805. Retrieved 3 December 2024.
- Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (September 1972). "58th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 717. Bibcode:1972IBVS..717....1K. Retrieved 2 December 2024.
- 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.
