Astronomy:Delta Librae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 00m 58.34830s[2] |
| Declination | −08° 31′ 08.2104″[2] |
| Apparent magnitude (V) | 4.93[3] |
| Characteristics | |
| Spectral type | B9.5V[4] |
| U−B color index | –0.10[5] |
| B−V color index | +0.00[5] |
| Variable type | Eclipsing binary of Algol type (EA/SD)[6] |
| Astrometry | |
| Radial velocity (Rv) | −38.7±2[7] km/s |
| Proper motion (μ) | RA: −63.051[2] mas/yr Dec.: −6.024[2] mas/yr |
| Parallax (π) | 9.2824 ± 0.4725[2] mas |
| Distance | 350 ± 20 ly (108 ± 5 pc) |
| Absolute magnitude (MV) | +0.15[8] |
| Orbit[9] | |
| Period (P) | 2.3274 d |
| Eccentricity (e) | 0.07 |
| Semi-amplitude (K1) (primary) | 76.6 km/s |
| Semi-amplitude (K2) (secondary) | 218.7 km/s |
| Details | |
| δ Lib A | |
| Mass | 4.9±0.2[9] M☉ |
| Radius | 3.94[10] R☉ |
| Luminosity | 86[8] L☉ |
| Temperature | 8800[10] K |
| Age | 0.5[10] Gyr |
| δ Lib B | |
| Mass | 1.7±0.2[9] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[11] With μ Virginis it forms one of the Akkadian lunar mansions Mulu-izi[12](meaning "Man-of-fire"[13]).
δ Librae is approximately 300 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[3] 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.[9] Its apparent magnitude varies from 4.91m to 5.9m.[14] The secondary is filling its Roche lobe and there is evidence of large-scale mass transfer in the past, with the star being more evolved than the primary.[9]
Along with λ Tauri, it was one of the first stars on which rotational line broadening[15] was observed, by Frank Schlesinger in 1911.
References
- ↑ Shobbrook, R. R. (December 2005). "Photometry of 20 eclipsing and ellipsoidal binary systems". The Journal of Astronomical Data 11: 7. Bibcode: 2005JAD....11....7S. https://ui.adsabs.harvard.edu/abs/2005JAD....11....7S. Retrieved 10 July 2022.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 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.
- ↑ 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.
- ↑ 5.0 5.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ "Del Lib". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=17591.
- ↑ 7.0 7.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ 8.0 8.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 9.0 9.1 9.2 9.3 9.4 Tomkin, J. (April 1978). "Secondaries of eclipsing binaries. I. Detection of the secondary of Delta Librae". Astrophysical Journal 221: 608–615. doi:10.1086/156064. Bibcode: 1978ApJ...221..608T.
- ↑ 10.0 10.1 10.2 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. doi:10.1086/509912. Bibcode: 2007ApJ...660.1556R.
- ↑ Becvar, Antonin (1964). Atlas coeli II - Katalog 1950.0. Bibcode: 1964ack..book.....B.
- ↑ Allen, R. H. (1963). Star Names: Their Lore and Meaning (rep. ed.). New York City , NY: Dover Publications Inc.. pp. 277, 473.
- ↑ 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.
- ↑ 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=del+lib. Retrieved 2018-01-07.
- ↑ Schlesinger, F. (1909). "Rotation of Stars about their Axes". Monthly Notices of the Royal Astronomical Society 71 (9): 719. doi:10.1093/mnras/71.9.719. Bibcode: 1911MNRAS..71..719S.
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