Astronomy:Nu2 Lyrae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 49m 52.91732s[1] |
| Declination | +32° 33′ 03.8170″[1] |
| Apparent magnitude (V) | 5.23[2] |
| Characteristics | |
| Spectral type | A3 V[3] |
| U−B color index | +0.12[2] |
| B−V color index | +0.10[2] |
| Astrometry | |
| Radial velocity (Rv) | +6.59±0.29[1] km/s |
| Proper motion (μ) | RA: −10.685[1] mas/yr Dec.: −11.771[1] mas/yr |
| Parallax (π) | 13.9238 ± 0.0703[1] mas |
| Distance | 234 ± 1 ly (71.8 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.97[4] |
| Details | |
| Mass | 1.91[5] M☉ |
| Radius | 1.5[6] R☉ |
| Luminosity | 32[7] L☉ |
| Surface gravity (log g) | 3.89±0.14[5] cgs |
| Temperature | 8,912±303[5] K |
| Rotational velocity (v sin i) | 128[3] km/s |
| Age | 214[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu2 Lyrae, Latinized from ν2 Lyrae, or sometimes simply Nu Lyrae, is a solitary[9] star in the northern constellation of Lyra. Based upon an annual parallax shift of 13.92 mas as seen from Earth, it is located around 234 light years from the Sun.[1] With an apparent visual magnitude of 5.23,[2] it is bright enough to be faintly visible to the naked eye.
This is a white-hued A-type main sequence star with a stellar classification of A3 V.[3] At an estimated age of 214 million years,[5] it is spinning with a projected rotational velocity of 128 km/s.[3] This is giving the star an oblate shape with an equatorial bulge that is 5% larger than the polar radius.[10] Nu2 Lyrae has an estimated 1.9 times the mass of the Sun[5] and about 1.5 times the Sun's radius.[6] It is radiating 32 times the solar luminosity[7] from its photosphere at an effective temperature of around 8,912 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 3.3 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 6.0 6.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "* nu. Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+nu.+Lyr.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
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