Short description: Double star in the constellation Sculptor
Lambda1 Sculptoris, Latinised from λ1 Sculptoris, is a double star system in the southern constellation of Sculptor. It is close to the lower limit of visibility to the naked eye, with a combined apparent visual magnitude of +6.05.[2] Based upon an annual parallax shift of 6.89 mas as measured from Earth,[1] it is located roughly 470 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.026 due to interstellar dust.[10]
The brighter star, component A, has a visual magnitude of 6.6, while the secondary, component B, is magnitude 7.0.[3] As of 2000, the pair had an angular separation of 0.737 arcsecond along a position angle of 14.0°.[3] Component A is a blue-white-hued B-type main-sequence star with a stellar classification of B9.5 V.[4] It has 2.8 times the mass of the Sun and radiates 94 times the solar luminosity from its photosphere at an effective temperature of 10,351 K.[8] The mass ratio is 0.609, meaning the secondary is only 60.9% as massive as the primary.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Westerlund, B. E. (1963), "Three-colour photometry of early-type stars near the galactic poles", Monthly Notices of the Royal Astronomical Society 127: 83, doi:10.1093/mnras/127.1.83, Bibcode: 1963MNRAS.127...83W.
- ↑ 3.0 3.1 3.2 Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics 356: 141–145, Bibcode: 2000A&A...356..141F.
- ↑ 4.0 4.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ Beavers, W. I.; Cook, D. B. (1980). "Scanner studies of composite spectra. I – Dwarfs". Astrophysical Journal Supplement Series 44: 489. doi:10.1086/190702. Bibcode: 1980ApJS...44..489B.
- ↑ 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.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 8.3 8.4 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "lam01 Scl – Double or multiple star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=lam01+Scl, retrieved 2017-05-30.
- ↑ Paunzen, E. et al. (October 2006), "An empirical temperature calibration for the Δ a photometric system. II. The A-type and mid F-type stars", Astronomy and Astrophysics 458 (1): 293–296, doi:10.1051/0004-6361:20064889, Bibcode: 2006A&A...458..293P.
- ↑ Makarov, Valeri V.; Fabricius, Claus (2021). "Astrometric Mass Ratios of 248 Long-period Binary Stars Resolved in Hipparcos and Gaia EDR3". The Astronomical Journal 162 (6): 260. doi:10.3847/1538-3881/ac2ee0. Bibcode: 2021AJ....162..260M.
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