Delta Librae

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δ Librae

A light curve for Delta Librae, adapted from Shobbrook (2005)[1]
Observation data
Epoch J2000      Equinox J2000
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]
Distance
350 ± 20 ly
(108 ± 5 pc)
Absolute magnitude (MV)+0.15[8]
Semi-amplitude
(K1)
(primary)		76.6 km/s
Semi-amplitude (K2)
(secondary)		218.7 km/s
Details
δ Lib A
Gyr
δ Lib B
Mass1.7±0.2[9] M☉
SAO
 140270
Database references
SIMBADdata

Delta Librae,

μ Virginis it forms one of the Akkadian lunar mansions Mulu-izi[12](meaning "Man-of-fire"[13]
).

δ Librae is approximately 300

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

  1. Bibcode:2005JAD....11....7S
    . Retrieved 10 July 2022.
  2. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  3. ^
    Bibcode:2002yCat.2237....0D
    .
  4. Bibcode:1999MSS...C05....0H
    .
  5. ^
    Bibcode:1966CoLPL...4...99J
    .
  6. ^ "Del Lib". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. Retrieved 27 September 2017.
  7. ^
    Bibcode:1953GCRV..C......0W
    .
  8. ^
    S2CID 119257644
    .
  9. ^
    doi:10.1086/156064
    .
  10. ^
    S2CID 11879505
    .
  11. Bibcode:1964ack..book.....B
    .
  12. Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications
    Inc. pp. 277, 473.
  13. ^ 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.
  14. S2CID 125853869
    . Retrieved 2018-01-07.
  15. doi:10.1093/mnras/71.9.719
    .
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