HD 134064 is a binary star system in the northern constellation of Boötes. It is faintly visible to the naked eye with a combined apparent visual magnitude of 6.03.[2] This system is located at a distance of 247 light years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of –7.0 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 07m 20.369s[1] |
| Declination | +18° 26′ 30.57″[1] |
| Apparent magnitude (V) | 6.03[2] |
| Characteristics | |
| Spectral type | A3Vnn[2] |
| U−B color index | +0.06[3] |
| B−V color index | +0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | –7.0[4] km/s |
| Proper motion (μ) | RA: +42.368 mas/yr[1] Dec.: −49.682 mas/yr[1] |
| Parallax (π) | 13.2096 ± 0.0324 mas[1] |
| Distance | 246.9 ± 0.6 ly (75.7 ± 0.2 pc) |
| Orbit[5] | |
| Period (P) | 8.0 yr |
| Semi-major axis (a) | 0.10″ |
| Eccentricity (e) | 0.45 |
| Inclination (i) | 122.6° |
| Longitude of the node (Ω) | 41.3° |
| Periastron epoch (T) | B 1939.97 |
| Argument of periastron (ω) (secondary) | 71.4° |
| Details | |
| HD 134064 A | |
| Mass | 2.15[6] M☉ |
| Luminosity | 16[7] L☉ |
| Surface gravity (log g) | 4.25[6] cgs |
| Temperature | 9,732±331[6] K |
| Rotational velocity (v sin i) | 185[6] km/s |
| Age | 160[6] Myr |
| HD 134064 B | |
| Mass | 0.73[8] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The components of this system are orbiting each other with a period of eight years and a high orbital eccentricity of 0.45.[5] The pair are separated by an orbital distance of around 8,000 AU.[8] The primary component is a rapidly rotating A-type main sequence star with a stellar classification of A3Vnn.[2] It has 2.15 times the mass of the Sun and is spinning with a projected rotational velocity of 185 km/s.[6] The secondary star has 73% of the Sun's mass.[8] The system is young, with an estimated age of 160 million years.[6]
References
edit- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d Paunzen, E.; et al. (July 2001), "A spectroscopic survey for λ Bootis stars. II. The observational data", Astronomy and Astrophysics, 373 (2): 625–632, Bibcode:2001A&A...373..625P, doi:10.1051/0004-6361:20010630.
- ^ a b Osawa, Kiyoteru (July 1959), "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of a0 V Stars", Astrophysical Journal, 130: 159, Bibcode:1959ApJ...130..159O, doi:10.1086/146706.
- ^ a b Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889–896, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776, S2CID 119323941.
- ^ a b "Sixth Catalog of Orbits of Visual Binary Stars", United States Naval Observatory, archived from the original on 1 August 2017, retrieved 21 May 2017.
- ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b c De Rosa, R. J.; et al. (January 2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932, S2CID 88503488.
- ^ "HD 134064", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2024-04-15.