Misplaced Pages

HR 5401 is a possible astrometric binary star system in the southern constellation of Lupus. With an apparent visual magnitude of 5.83, 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, yielding a range of 205 light years. It is moving closer to Earth with a heliocentric radial velocity of −30 km/s, and is expected to come within 161 ly in ~524,000 years.

This is an Am star with a stellar classification of A1m A5/7-F2. Lu (1991) lists it as a likely dwarf barium star. It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 7,300 K. This system is a source of X-ray emission which may be coming from the companion.

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.

References

1. ^ 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.
2. ^ 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.
3. ^ 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.
4. ^ 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.
5. ^ 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.
6. "HD 126504". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-30.
7. 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.
8. ^ 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.
9. Lu, Phillip K. (1991), "Taxonomy of barium stars", Astronomical Journal, 101: 2229, Bibcode:1991AJ....101.2229L, doi:10.1086/115845.
10. 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.

v t e Constellation of Lupus
List of stars in Lupus Lupus in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ ι κ κ λ μ ν ν ξ ξ ο π ρ σ τ τ υ φ φ χ ψ ψ ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 HR 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 142527 Other Gliese 588 HIP 70849 Lupus-TR-3 SAO 206462 SSSPM J1549-3544 WASP-132
Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b
Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986
Nebulae IC 4406 NGC 5882
Galaxies NGC 5643
Category

• Am stars
• Astrometric binaries
• Lupus (constellation)
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects