HD 126129 and HD 126128
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[1] |
| HD 126129 | |
| Right ascension | 14h 23m 22.69548s[2] |
| Declination | +08° 26′ 47.8266″[2] |
| Apparent magnitude (V) | 5.04[3] |
| HD 126128 | |
| Right ascension | 14h 23m 22.59914s[4] |
| Declination | +08° 26′ 41.6666″[4] |
| Apparent magnitude (V) | 6.74[3] (7.50 + 7.70)[5] |
| Characteristics | |
| HD 126129 | |
| Evolutionary stage | main sequence[6] |
| Spectral type | A0V[7] |
| U−B color index | −0.08[8] |
| B−V color index | −0.02[8] |
| HD 126128 | |
| Spectral type | F0V + F2V[7] |
| U−B color index | −0.01[8] |
| B−V color index | +0.43[8] |
| Astrometry | |
| HD 126129 | |
| Radial velocity (Rv) | −22.6[9] km/s |
| Proper motion (μ) | RA: −75.188[2] mas/yr Dec.: −9.265[2] mas/yr |
| Parallax (π) | 14.3216±0.1123 mas[2] |
| Distance | 228 ± 2 ly (69.8 ± 0.5 pc) |
| HD 126128 | |
| Radial velocity (Rv) | −17.6[9] km/s |
| Proper motion (μ) | RA: −83.783[4] mas/yr Dec.: −4.601[4] mas/yr |
| Parallax (π) | 9.7572±0.7363 mas[10] |
| Distance | 330 ± 30 ly (102 ± 8 pc) |
| Orbit[11] | |
| Primary | B |
| Companion | C |
| Period (P) | 40.0 yr |
| Semi-major axis (a) | 0.24″ |
| Eccentricity (e) | 0.25 |
| Inclination (i) | 42° |
| Details | |
| HD 126129 | |
| Mass | 2.4[2] M☉ |
| Radius | 2.4[2] R☉ |
| Luminosity | 47[2] L☉ |
| Surface gravity (log g) | 3.95[2] cgs |
| Temperature | 9,729[2] K |
| Rotational velocity (v sin i) | 133[6] km/s |
| Age | 381[2] Myr |
| B | |
| Mass | 1.37 M☉ |
| Rotational velocity (v sin i) | 133[12] km/s |
| C | |
| Mass | 1.31 M☉ |
| Other designations | |
| BD+09°2882, HIP 70327, ADS 9247, WDS J14234+0827[13] | |
| HD 126129: HD 126129, HR 5386, SAO 120426 | |
| HD 126128: HD 126128, HR 5385 | |
| Database references | |
| SIMBAD | data |
| HD 126129 | |
| HD 126128 | |
HD 126129 and HD 126128 form a triple star in the northern constellation of Boötes. HD 126128 is a very close pair which lies at an angular separation of 6.250″ from the brightest member of the trio, HD 126129.[7]
The Hipparcos parallax for the combined triple is 15.17±0.42 mas, suggesting a distance around 215 light years.[14] The Gaia DR3 parallax for HD 126129 (component A) indicates a distance close to 228 light years. Gaia DR3 does not contain a parallax for the BC pair HD 126128, but Gaia DR2 indicates an approximate distance of 330 light years. However, the stars are treated as being related and both are considered members of the IC 2391 supercluster.[15]
References
- ^ 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.
- ^ a b c d e f g h i j k Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5.
- ^ a b Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
- ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- ^ a b c d Neckel, T.; Klare, G.; Sarcander, M. (1980). "Catalogue of Extinction Data of 12547 O-Stars to F-Stars Galactic Clusters and Delta-Cephei Stars". Bulletin d'Information du Centre de Donnees Stellaires. 19: 61. Bibcode:1980BICDS..19...61N.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ 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. Gaia DR2 record for this source at VizieR.
- ^ Söderhjelm, Staffan (1999). "Visual binary orbits and masses POST HIPPARCOS". Astronomy and Astrophysics. 341: 121. Bibcode:1999A&A...341..121S.
- ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. S2CID 18475298.
- ^ "HIP+70327". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-04-15.
- ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ Eggen, O. J. (1991). "The IC 2391 Supercluster". The Astronomical Journal. 102: 2028. Bibcode:1991AJ....102.2028E. doi:10.1086/116025.