4 Lacertae

4 Lacertae is a single[9] star in the northern constellation Lacerta, located about 1,900 light years away.[1] This object visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.55.[2] It is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.[2] This star is a suspected member of the Lac OB1 association.[10][4]

4 Lacertae
Observation data
Epoch J2000      Equinox J2000
Constellation Lacerta
Right ascension  22h 24m 30.99079s[1]
Declination +49° 28′ 34.9992″[1]
Apparent magnitude (V) 4.55[2]
Characteristics
Spectral type A0 Ib[3]
B−V color index 0.092±0.034[2]
Astrometry
Radial velocity (Rv)−26.0±1.7[2] km/s
Proper motion (μ) RA: −4.800[1] mas/yr
Dec.: −2.598[1] mas/yr
Parallax (π)1.7577 ± 0.2697[1] mas
Distanceapprox. 1,900 ly
(approx. 570 pc)
Absolute magnitude (MV)−4.42[4]
Details
Mass19+13
−8[5] M☉
Radius59[5] R☉
Luminosity62,000[5] L☉
Surface gravity (log g)2.18[5] cgs
Temperature11,800[5] K
Metallicity [Fe/H]0.28±0.04[6] dex
Rotational velocity (v sin i)28±3[5] km/s
Age25.1±2.5[7] Myr
Other designations
4 Lac, BD+48° 3715, HD 212593, HIP 110609, HR 8541, SAO 51970[8]
Database references
SIMBADdata

This is a supergiant[10] star with a stellar classification of A0 Ib.[3] The surface abundances show evidence of material that has been processed via the CNO cycle at the core.[10] It has ten[7] times the mass of the Sun and has expanded to about 59[5] times the Sun's radius. The star is around 25[7] million years old and is spinning with a projected rotational velocity of 28 km/s.[5]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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.
  3. Gray, R. O.; Garrison, R. F. (1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", The Astrophysical Journal Supplement Series, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
  4. Kaltcheva, Nadia (October 2009), "Lacerta OB1 Revisited", Publications of the Astronomical Society of the Pacific, 121 (884): 1045, Bibcode:2009PASP..121.1045K, doi:10.1086/606037.
  5. Markova, N.; Puls, J. (2008), "Bright OB stars in the Galaxy. IV. Stellar and wind parameters of early to late B supergiants", Astronomy and Astrophysics, 478 (3): 823, arXiv:0711.1110, Bibcode:2008A&A...478..823M, doi:10.1051/0004-6361:20077919
  6. Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637x/826/2/171.
  7. 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.
  8. "4 Lac". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-28.
  9. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  10. Yüce, Kutluay (2005), "Spectral Analysis of 4 Lacertae and ν Cephei", Baltic Astronomy, 14: 51–82, Bibcode:2005BaltA..14...51Y.
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