HR 5401 is a possible astrometric binary[7] star system in the southern constellation of Lupus. With an apparent visual magnitude of 5.83,[2] it is just visible to the naked eye under good seeing conditions. The distance to HR 5401 can be estimated from its annual parallax shift of 15.9 mas,[1] yielding a range of 205 light years. It is moving closer to Earth with a heliocentric radial velocity of −30 km/s,[4] and is expected to come within 161 ly in ~524,000 years.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 27m 12.18204s[1] |
| Declination | −46° 08′ 58.1316″[1] |
| Apparent magnitude (V) | 5.83[2] |
| Characteristics | |
| Spectral type | A1m A5/7-F2[3] |
| B−V color index | 0.311±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −30.0±3.8[4] km/s |
| Proper motion (μ) | RA: −168.816[1] mas/yr Dec.: −82.297[1] mas/yr |
| Parallax (π) | 15.8815 ± 0.2813 mas[1] |
| Distance | 205 ± 4 ly (63 ± 1 pc) |
| Absolute magnitude (MV) | 2.01[2] |
| Details | |
| Luminosity | 13.01[2] L☉ |
| Surface gravity (log g) | 3.92[5] cgs |
| Temperature | 7,300[5] K |
| Metallicity [Fe/H] | 0.2[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an Am star[8] with a stellar classification of A1m A5/7-F2.[3] Lu (1991) lists it as a likely dwarf barium star.[9] It is radiating 13[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,300 K.[5] This system is a source of X-ray emission which may be coming from the companion.[8]
HR 5401 has two visual companions. Component B is a magnitude 11.50 star at an angular separation of 33.1″ along a position angle (PA) of 114°, as of 1999. The second companion, designated component C, is magnitude 11.16 with a separation of 27.20″ at a PA of 164°, as of 2000.[10]
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 f g 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 (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b 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.
- ^ a b c d North, P.; et al. (January 1994), "The nature of the F STR lambda 4077 stars. 3: Spectroscopy of the barium dwarfs and other CP stars", Astronomy and Astrophysics, 281 (3): 775–796, Bibcode:1994A&A...281..775N.
- ^ "HD 126504". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-30.
- ^ 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.
- ^ a b Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
- ^ Lu, Phillip K. (1991), "Taxonomy of barium stars", Astronomical Journal, 101: 2229, Bibcode:1991AJ....101.2229L, doi:10.1086/115845.
- ^ Mason, B. D.; et al. (2008), "Washington Visual Double Star Catalog, 2006.5 (WDS)", The Astronomical Journal, 122 (6), U. S. Naval Observatory, Washington D.C.: 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.