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Delta Librae, Latinized from δ Librae, is a variable star in the constellation Libra. It has the traditional name Zuben Elakribi, a variant of the traditional name of Gamma Librae.[12] With μ Virginis it forms one of the Akkadian lunar mansions Mulu-izi[13] (meaning “Man-of-fire”).[14]

A light curve for Delta Librae, adapted from Shobbrook (2005)[15]

δ Librae is approximately 350 light years from the Earth and the primary, component A, belongs to the spectral class B9.5V, indicating it is a B-type main-sequence star. It is visible to the naked eye with an apparent visual magnitude of 4.93[2] and is moving closer to the Sun with a radial velocity of −39 km/s.[7] This is an Algol-like eclipsing binary star system, with a period of 2.3274 days and an eccentricity of 0.07.[10] Its apparent magnitude varies from 4.91 to 5.90.[16] The secondary is filling its Roche lobe and there is evidence of large-scale mass transfer in the past, with the secondary being more evolved than the primary despite now being less massive.[10]

Along with λ Tauri, it was one of the first stars on which rotational line broadening was observed, by Frank Schlesinger in 1911.[17]

References

  1. ^ a b c d e 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.
  2. ^ a b Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237….0D.
  3. ^ Zorec, J.; Royer, F. (2012). “Rotational velocities of A-type stars. IV. Evolution of rotational velocities”. Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A…537A.120Z. doi:10.1051/0004-6361/201117691.
  4. ^ Houk, N.; Swift, C. (1999). “Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5”. Michigan Spectral Survey. 5. Bibcode:1999MSS…C05….0H.
  5. ^ a b Johnson, H. L. (1966). “UBVRIJKL Photometry of the Bright Stars”. Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL…4…99J.
  6. ^ “Del Lib”. The International Variable Star Index. AAVSO – American Association of Variable Star Observers. Retrieved 27 September 2017.
  7. ^ a b Wilson, Ralph Elmer (1953). “General catalogue of stellar radial velocities”. Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C……0W.
  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. S2CID 119257644.
  9. ^ a b c Malkov, Oleg Yu (2020-02-01). “Semidetached double-lined eclipsing binaries: Stellar parameters and rare classes”. Monthly Notices of the Royal Astronomical Society. 491 (4): 5489–5497. Bibcode:2020MNRAS.491.5489M. doi:10.1093/mnras/stz3363. ISSN 0035-8711.
  10. ^ a b c d e Tomkin, J. (April 1978). “Secondaries of eclipsing binaries. I. Detection of the secondary of Delta Librae”. Astrophysical Journal. 221: 608–615. Bibcode:1978ApJ…221..608T. doi:10.1086/156064.
  11. ^ Rhee, Joseph H.; Song, Inseok; Zuckerman, B.; McElwain, Michael (2007). “Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs”. The Astrophysical Journal. 660 (2): 1556–1571. arXiv:astro-ph/0609555. Bibcode:2007ApJ…660.1556R. doi:10.1086/509912. S2CID 11879505.
  12. ^ Becvar, Antonin (1964). Atlas coeli II – Katalog 1950.0. Bibcode:1964ack..book…..B.
  13. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc. pp. 277, 473.
  14. ^ Brown Jr., R. (1891). “Remarks on the Euphratean Astronomical Names of the Signs of the Zodiac”. Proceedings of the Society of Biblical Archaeology. 13: 194.
  15. ^ Shobbrook, R. R. (December 2005). “Photometry of 20 eclipsing and ellipsoidal binary systems”. The Journal of Astronomical Data. 11: 7. Bibcode:2005JAD….11….7S.
  16. ^ Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). “General Catalogue of Variable Stars”. Astronomy Reports. GCVS 5.1. 61 (1): 80–88. Bibcode:2017ARep…61…80S. doi:10.1134/S1063772917010085. S2CID 125853869. Retrieved 2018-01-07.
  17. ^ Schlesinger, F. (1909). “Rotation of Stars about their Axes”. Monthly Notices of the Royal Astronomical Society. 71 (9): 719. Bibcode:1911MNRAS..71..719S. doi:10.1093/mnras/71.9.719.