Lambda Lyrae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 00m 00.82568s[1] |
| Declination | +32° 8′ 43.8527″[1] |
| Apparent magnitude (V) | 4.937[2] |
| Characteristics | |
| Spectral type | K2.5 II[3] |
| U−B color index | +1.609[2] |
| B−V color index | +1.455[2] |
| Astrometry | |
| Radial velocity (Rv) | -17.69 ± 0.02[4] km/s |
| Proper motion (μ) | RA: 6.08[1] mas/yr Dec.: 9.96[1] mas/yr |
| Parallax (π) | 2.95 ± 0.25[1] mas |
| Distance | 1,110 ± 90 ly (340 ± 30 pc) |
| Absolute magnitude (MV) | −3.75+0.65 −0.50[3] |
| Details | |
| Mass | 6.3 ± 0.8[5] M☉ |
| Radius | 120[6] R☉ |
| Luminosity | 2,228[7] L☉ |
| Surface gravity (log g) | 2.21[3] cgs |
| Temperature | 4,220[3] K |
| Metallicity [Fe/H] | −0.02[3] dex |
| Rotational velocity (v sin i) | 3.2±1.0[3] km/s |
| Age | 58.4 ± 22.6[5] Myr |
| Other designations | |
Lambda Lyrae (λ Lyr) is a 5th magnitude star in the constellation Lyra, approximately 1,100 light years away from Earth. It is an orange bright giant star of the spectral type K2.5II. It is much brighter and larger, yet cooler, than our Sun.[8] The star is about 6.3 solar masses in mass and has a diameter over a hundred times that of the sun's.
References
- 1 2 3 4 5 van Leeuwen, F. (November 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.
- 1 2 3 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society 172: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
- 1 2 3 4 5 6 Carney, Bruce W.; et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal 135 (3): 892–906, arXiv:0711.4984, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892.
- ↑ Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430: 165–186, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
- 1 2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410: 190, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
- ↑ Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ↑ McDonald, I.; Zijlstra, A. A; Boyer, M. L. (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.
- 1 2 "Simbad Query Result". Simbad. Retrieved October 15, 2007.
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