HR 5401
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Lupus[1] |
| Right ascension | 14h 27m 12.15415s[2] |
| Declination | −46° 08′ 03.0975″[2] |
| Apparent magnitude (V) | 5.83[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A1m A5/7-F2[3] |
| B−V color index | 0.311±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −30.0±3.8[4] km/s |
| Proper motion (μ) | RA: −150.420[2] mas/yr Dec.: −88.472[2] mas/yr |
| Parallax (π) | 20.6065±0.4550 mas[2] |
| Distance | 158 ± 3 ly (49 ± 1 pc) |
| Absolute magnitude (MV) | +2.01[1] |
| Details | |
| Luminosity | 13.01[1] L☉ |
| Surface gravity (log g) | 3.92[5] cgs |
| Temperature | 7,300[5] K |
| Metallicity [Fe/H] | 0.2[5] dex |
| Other designations | |
| CD−45°9188, HD 126504, HIP 70663, HR 5401, SAO 224929, WDS J14272-4608A[6] | |
| 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,[1] 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,[2] yielding a range of 158 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.[1]
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[1] 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]- 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.
- 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.
- 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.
- 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.
- 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.
- ↑ "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.
- 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.
- ↑ 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.
