HD 143699 is a single[7] star in the southern constellation of Lupus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.90.[2] Based upon an annual parallax shift of 9.2 mas,[1] it is located around 350 light years away. It is most likely (90%[8] chance) a member of the Upper Centaurus–Lupus[9] subgroup of the Sco OB2 moving group.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 16h 03m 24.18956s[1] |
| Declination | −38° 36′ 09.1424″[1] |
| Apparent magnitude (V) | 4.90[2] |
| Characteristics | |
| Spectral type | B5/7 III/IV[3] |
| B−V color index | −0.146±0.043[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.9±2.8[2] km/s |
| Proper motion (μ) | RA: −18.488[1] mas/yr Dec.: −28.147[1] mas/yr |
| Parallax (π) | 9.2268 ± 0.4693 mas[1] |
| Distance | 350 ± 20 ly (108 ± 6 pc) |
| Absolute magnitude (MV) | −0.54[2] |
| Details | |
| Mass | 4.31±0.07[4] M☉ |
| Radius | 4.4[5] R☉ |
| Luminosity | 438+39 −36[4] L☉ |
| Temperature | 14521+202 −401[4] K |
| Rotational velocity (v sin i) | 123[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This star has a stellar classification of B5/7 III/IV,[3] suggesting it is an evolving star that is entering the giant stage. However, according to Zorec and Royer (2012) it is only 56% of the way through its main sequence lifespan.[4] It is a chemically peculiar magnetic B star,[10] showing an averaged quadratic field strength of (167.2±140.4)×10−3 T.[11] Helium-weak, it displays an underabundance of helium in its spectrum.[12] Radio emissions have been detected from this source.[10]
HD 143699 has 4.3[4] times the mass of the Sun and 4.4[5] times the Sun's radius. It has a high rate of spin with a projected rotational velocity of 123 km/s.[4] The star is radiating 438[4] times the Sun's luminosity from its photosphere at an effective temperature of 14,521 K.[4]
References
edit- ^ a b c d e f 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.
- ^ a b c d e 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.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ a b c d e f g h i Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ "HD 143699". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-29.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Rizzuto, Aaron; et al. (October 2011), "Multidimensional Bayesian membership analysis of the Sco OB2 moving group", Monthly Notices of the Royal Astronomical Society, 416 (4): 3108–17, arXiv:1106.2857, Bibcode:2011MNRAS.416.3108R, doi:10.1111/j.1365-2966.2011.19256.x, S2CID 54510608.
- ^ Bobylev, V. V.; Bajkova, A. T. (September 2007), "Kinematics of the Scorpius–Centaurus OB association", Astronomy Letters, 33 (9): 571–583, arXiv:0708.0943, Bibcode:2007AstL...33..571B, doi:10.1134/S1063773707090010, S2CID 15785349.
- ^ a b Linsky, Jeffrey L.; et al. (July 1992), "Radio Emission from Chemically Peculiar Stars", Astrophysical Journal, 393: 341, Bibcode:1992ApJ...393..341L, doi:10.1086/171509.
- ^ Bychkov, V. D.; et al. (2009), "Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars", Monthly Notices of the Royal Astronomical Society, 394 (3): 1338, Bibcode:2009MNRAS.394.1338B, doi:10.1111/j.1365-2966.2008.14227.x, S2CID 120268049.
- ^ Kilambi, Gopal C.; et al. (June 1992), "Mid-ultraviolet and optical photometry of helium stars", Journal of Astrophysics and Astronomy, 13 (2): 175–194, Bibcode:1992JApA...13..175K, doi:10.1007/BF02702309, S2CID 119896529