Beta Lyrae

Beta Lyrae

Location of β Lyrae in Lyra
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 50m 04.79525s[1]
Declination +33° 21′ 45.6100″[1]
Apparent magnitude (V) 3.52[2] (3.25 – 4.36[3])
Characteristics
Spectral type B6-8II[4][5] + B[2]
U−B color index −0.56[6]
B−V color index +0.00[6]
Variable type β Lyr[3]
Astrometry
A
Radial velocity (Rv)−19.2[7] km/s
Proper motion (μ) RA: 1.90[1] mas/yr
Dec.: −3.53[1] mas/yr
Parallax (π)3.39 ± 0.17 mas[1]
Distance960 ± 50 ly
(290 ± 10 pc)
Absolute magnitude (MV)−3.82[8]
B
Radial velocity (Rv)−14±5[9] km/s
Proper motion (μ) RA: 4.373±0.087[10] mas/yr
Dec.: −0.982±0.098[10] mas/yr
Parallax (π)3.0065 ± 0.0542 mas[10]
Distance1,080 ± 20 ly
(333 ± 6 pc)
Orbit[2]
PrimaryAa1
CompanionBeta Lyrae Aa2
Period (P)12.9414 days
Semi-major axis (a)0.865±0.048 mas
Eccentricity (e)0
Inclination (i)92.25 ± 0.82°
Longitude of the node (Ω)254.39 ± 0.83°
Details[11]
β Lyr Aa1
Mass2.97 ± 0.2 M☉
Radius15.2 ± 0.2 R☉
Luminosity6,500 L☉
Surface gravity (log g)2.5 ± 0.1 cgs
Temperature13,300 K
Age23 Myr
β Lyr Aa2
Mass13.16 ± 0.3 M☉
Radius6.0 ± 0.2 R☉
Luminosity26,300 L☉
Surface gravity (log g)4.0 ± 0.1 cgs
Temperature30,000 ± 2,000 K
Other designations
Sheliak, Shelyak, Shiliak, WDS 18501+3322[12]
β Lyrae A: 10 Lyrae, AAVSO 1846+33, BD+33 3223, FK5 705, HD 174638, HIP 92420, HR 7106, SAO 67451/2
β Lyrae B: HD 174664, BD+33 3224, SAO 67453
Database references
SIMBADβ Lyrae
B

Beta Lyrae (β Lyrae, abbreviated Beta Lyr, β Lyr) officially named Sheliak (Arabic: الشلياق, Romanization: ash-Shiliyāq) (IPA: /ˈʃiːliæk/), the traditional name of the system, is a multiple star system in the constellation of Lyra. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 960 light-years (290 parsecs) distant from the Sun.

Although it appears as a single point of light to the naked eye, it actually consists of six components of apparent magnitude 14.3 or brighter. The brightest component, designated Beta Lyrae A, is itself a triple star system, consisting of an eclipsing binary pair (Aa) and a single star (Ab). The binary pair's two components are designated Beta Lyrae Aa1 and Aa2. The additional five components, designated Beta Lyrae B, C, D, E, and F, are currently considered to be single stars.[12][13][14][15][16][17]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference apj684_2_L95 was invoked but never defined (see the help page).
  3. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. ^ Cite error: The named reference bastian2019 was invoked but never defined (see the help page).
  5. ^ Mourard, D.; Brož, M.; Nemravová, J. A.; Harmanec, P.; Budaj, J.; Baron, F.; Monnier, J. D.; Schaefer, G. H.; Schmitt, H.; Tallon-Bosc, I.; Armstrong, J. T.; Baines, E. K.; Bonneau, D.; Božić, H.; Clausse, J. M.; Farrington, C.; Gies, D.; Juryšek, J.; Korčáková, D.; McAlister, H.; Meilland, A.; Nardetto, N.; Svoboda, P.; Šlechta, M.; Wolf, M.; Zasche, P. (2018). "Physical properties of β Lyrae a and its opaque accretion disk". Astronomy and Astrophysics. 618: A112. arXiv:1807.04789. Bibcode:2018A&A...618A.112M. doi:10.1051/0004-6361/201832952. S2CID 73647379.
  6. ^ a b Cite error: The named reference ppc was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference gcrv1953 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference gcvrs was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference MNRAS432_1_799 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBADC was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference SIMBADD was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference SIMBADE was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference SIMBADF was invoked but never defined (see the help page).