Delta1 Lyrae

Delta1 Lyrae, Latinized from δ1 Lyrae, is a binary star system in the constellation Lyra, approximately 1,100 light years away from Earth. The two stars complete an orbit around each other about once every 88 days. They are a spectroscopic binary, meaning the separation between the two is very small, and their orbital velocity is very high.[1][8]

For other stars with this Bayer designation, see δ Lyrae.
Delta1 Lyrae[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension  18h 53m 43.55911s[2]
Declination +36° 58′ 18.1920″[2]
Apparent magnitude (V) 5.56[3]
Characteristics
Spectral type B2.5V[4][5]
U−B color index −0.67[3]
B−V color index −0.15[3]
Astrometry
Radial velocity (Rv)−25.8[6] km/s
Proper motion (μ) RA: +0.78[2] mas/yr
Dec.: −3.09[2] mas/yr
Parallax (π)3.29 ± 0.25[2] mas
Distance990 ± 80 ly
(300 ± 20 pc)
Absolute magnitude (MV)−1.55[7]
Orbit[8]
Period (P)88.352 days yr
Eccentricity (e)0.37±0.03
Argument of periastron (ω)
(secondary)		204.5±7°
Details
δ1 Lyr A
Mass7.9±0.1[5] M☉
Luminosity838[7] L☉
Luminosity (bolometric)3,620[9] L☉
Temperature20,350[9] K
Metallicity [Fe/H]−0.05[7] dex
Rotational velocity (v sin i)110[10] km/s
Age21.1±2.2[5] Myr
Other designations
Delta1 Lyrae, 11 Lyrae, BD+36°3307, HD 175426, HIP 92728, HR 7131, SAO 67537, GC 25934, GSC 02650-02146, IDS 18502+3650
Database references
SIMBADdata

The primary member, component A, is a bluish white main-sequence star of the spectral type B2.5V.

References
  1. "* del01 Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 15, 2007.
  2. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  3. Guetter, H. H. (October 1974), "UBV photometry of 180 early-type stars", Publications of the Astronomical Society of the Pacific, 86: 795–797, Bibcode:1974PASP...86..795G, doi:10.1086/129675.
  4. Guetter, Harry H. (April 1968), "Spectral classification of 239 early-type stars", Publications of the Astronomical Society of the Pacific, 80 (473): 197, Bibcode:1968PASP...80..197G, doi:10.1086/128611.
  5. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  6. Wilson, Ralph Elmer (1953), General catalogue of stellar radial velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  7. 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.
  8. Richardson, E. H.; McKellar, A. (1957). "Redetermination of the spectrographic orbit of delta1 Lyrae". Publ. Dominion Astrophys. Obs. 10: 407–413. Bibcode:1958PDAO...10..407R. , p. 412
  9. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  10. Abt, Helmut A.; et al. (2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573: 359, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
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