Nu1 Lyrae

Nu1 Lyrae (ν1 Lyrae) is a star in the northern constellation of Lyra. Based upon an annual parallax shift of 2.49 mas as seen from Earth, it is located approximately 1,300 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.35 due to interstellar dust.[5] With an apparent visual magnitude of 5.91,[2] the star is barely bright enough to be visible with the naked eye on a dark night.

For other stars with this Bayer designation, see ν Lyrae
ν1 Lyrae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lyra
Right ascension 18h 49m 45.91431s[1]
Declination +32° 48′ 46.1656″[1]
Apparent magnitude (V) 5.91[2]
Characteristics
Spectral type B3 IV[3]
U−B color index −0.71[2]
B−V color index −0.16[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)−26.30±1.2 km/s
Proper motion (μ) RA: +2.32±0.17[1] mas/yr
Dec.: −3.87±0.30[1] mas/yr
Parallax (π)2.49 ± 0.24 mas[1]
Distance1,300 ± 100 ly
(400 ± 40 pc)
Absolute magnitude (MV)−1.73[5]
Details
Mass6.9±0.1[3] M☉
Luminosity1,460[6] L☉
Surface gravity (log g)3.86[7] cgs
Temperature14,534[6] K
Rotational velocity (v sin i)145[8] km/s
Age39.8±3.7[3] Myr
Other designations
ν1 Lyr, 8 Lyr, BD+32° 3227, HD 174585, HIP 92398, HR 7100, SAO 67441.[9]
Database references
SIMBADdata

This is a blue-white hued B-type subgiant star with a stellar classification of B3 IV.[3] It is a suspected variable.[4] The star has nearly seven times the mass of the Sun and, at an estimated age of about 40[3] million years, is spinning with a projected rotational velocity of 145 km/s.[8] It radiates approximately 1460 times the solar luminosity from its photosphere at an effective temperature of 14,534 K.[6]

Nu1 Lyrae has four faint visual companions, the nearest being a magnitude 13.0 star at an angular separation of 34.1 arc seconds along a position angle of 76°, as of 2009.[10]

References
  1. 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, S2CID 18759600.
  2. Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. 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, S2CID 118629873.
  4. 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.
  5. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  6. McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
  7. Gerbaldi, M.; et al. (November 2001), "Binary systems with post-T Tauri secondaries", Astronomy and Astrophysics, 379: 162–184, Bibcode:2001A&A...379..162G, doi:10.1051/0004-6361:20011298.
  8. Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  9. "nu.01 Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-17.{{cite web}}: CS1 maint: postscript (link)
  10. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
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