HR 5401

HR 5401
Observation data
Epoch J2000      Equinox ICRS
Constellation Lupus
Right ascension 14h 27m 12.15415s
Declination −46° 08′ 03.0975″
Apparent magnitude (V) 5.83
Characteristics
Evolutionary stage main sequence
Spectral type A1m A5/7-F2
B−V color index 0.311±0.004
Astrometry
Radial velocity (Rv)−30.0±3.8 km/s
Proper motion (μ) RA: −150.420 mas/yr
Dec.: −88.472 mas/yr
Parallax (π)20.6065±0.4550 mas
Distance158 ± 3 ly
(49 ± 1 pc)
Absolute magnitude (MV)+2.01
Details
Luminosity13.01 L☉
Surface gravity (log g)3.92 cgs
Temperature7,300 K
Metallicity [Fe/H]0.2 dex
Other designations
CD−45°9188, HD 126504, HIP 70663, HR 5401, SAO 224929, WDS J14272-4608A
Database references
SIMBADdata

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 20.6 mas, yielding a range of 158 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. 1 2 3 4 5 6 7 8 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 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. 1 2 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. 1 2 3 4 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. 1 2 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.