Astronomy:HR 5401
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+126504.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 8.0 8.1 Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677–684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S.
- ↑ Lu, Phillip K. (1991), "Taxonomy of barium stars", Astronomical Journal 101: 2229, doi:10.1086/115845, Bibcode: 1991AJ....101.2229L.
- ↑ Mason, B. D. et al. (2008), "Washington Visual Double Star Catalog, 2006.5 (WDS)", The Astronomical Journal (U. S. Naval Observatory, Washington D.C.) 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
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