Iota Lyrae
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h07m18.13251s[2] |
| Declination | +36° 06′ 00.5592″[2] |
| Apparent magnitude(V) | 5.22[3] |
| Characteristics | |
| Spectral type | B6IV[4] |
| Variable type | Be star[5] |
| Astrometry | |
| Radial velocity(Rv) | −26.0±4.6[6]km/s |
| Proper motion(μ) | RA:−1.437[2]mas/yr Dec.:−3.876[2]mas/yr |
| Parallax(π) | 3.5858 ± 0.1924mas[2] |
| Distance | 910 ± 50ly (280 ± 10pc) |
| Absolute magnitude(MV) | −1.94[7] |
| Orbit[8] | |
| Period(P) | 216.93yr |
| Semi-major axis(a) | 0.172″ |
| Eccentricity(e) | 0.637 |
| Inclination(i) | 145.5° |
| Longitude of the node(Ω) | 171.4° |
| Periastronepoch(T) | B1997.28 |
| Argument of periastron(ω) (secondary) | 201.2° |
| Details | |
| Mass | 5.2[9]M☉ |
| Radius | 6.7[10]R☉ |
| Luminosity | 854[10]L☉ |
| Surface gravity(logg) | 3.54[9]cgs |
| Temperature | 12,059[10]K |
| Metallicity[Fe/H] | −0.11[9]dex |
| Rotational velocity(vsini) | 224[11]km/s |
| Age | 168[12]Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
ι Lyrae,Latinised asIota Lyrae,is abinary star[3]in the northernconstellationofLyra.It is visible to the naked eye as a dim, blue-white hued star with anapparent visual magnitudethat fluctuates around 5.22.[3]This object is located approximately 910light yearsdistant from the Sun based onparallax,but is drifting nearer with aradial velocityof −26 km/s.[6]
This is a wide binary system with a computedorbital periodof 217 years and aneccentricityof 0.6.[8]The primary component has astellar classificationof B6IV,[4]matching aB-typesubgiant star.It is aBe star,[14]displayingemission linesin itsspectrum,and is spinning rapidly with aprojected rotational velocityof224 km/s.[11]The star ranges in brightness from magnitude 5.20 down to 5.27.[5]It has about five times themass of the Sunand is radiating 854 times theSun's luminosityfrom itsphotosphereat aneffective temperatureof12,059K.
References
[edit]- ^"MAST: Barbara A. Mikulski Archive for Space Telescopes".Space Telescope Science Institute.Retrieved3 January2023.
- ^abcdeBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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 sourceatVizieR.
- ^abcEggleton, 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.arXiv:0806.2878.Bibcode:2008MNRAS.389..869E.doi:10.1111/j.1365-2966.2008.13596.x.S2CID14878976.
- ^abLesh, Janet Rountree (December 1968)."The Kinematics of the Gould Belt: an Expanding Group?".Astrophysical Journal Supplement.17:371.Bibcode:1968ApJS...17..371L.doi:10.1086/190179.
- ^abSamus, N. N.; et al. (2017), "General Catalogue of Variable Stars",Astronomy Reports,5.1,61(1): 80–88,Bibcode:2017ARep...61...80S,doi:10.1134/S1063772917010085,S2CID125853869.
- ^abGontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system".Astronomy Letters.32(11): 759–771.arXiv:1606.08053.Bibcode:2006AstL...32..759G.doi:10.1134/S1063773706110065.S2CID119231169.
- ^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.S2CID119257644.
- ^ab"Sixth Catalog of Orbits of Visual Binary Stars".United States Naval Observatory.Archived fromthe originalon 1 August 2017.Retrieved15 March2017.
- ^abcAnders, F.; et al. (August 2019)."Photo-astrometric distances, extinctions, and astrophysical parameters forGaiaDR2 stars brighter thanG= 18 ".Astronomy & Astrophysics.628:A94.arXiv:1904.11302.Bibcode:2019A&A...628A..94A.doi:10.1051/0004-6361/201935765.eISSN1432-0746.ISSN0004-6361.
- ^abcMcDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017)."Fundamental parameters and infrared excesses of Tycho–Gaia stars".Monthly Notices of the Royal Astronomical Society.471(1): 770–791.arXiv:1706.02208.Bibcode:2017MNRAS.471..770M.doi:10.1093/mnras/stx1433.eISSN1365-2966.ISSN0035-8711.
- ^abZorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities".Astronomy & Astrophysics.537:A120.arXiv:1201.2052.Bibcode:2012A&A...537A.120Z.doi:10.1051/0004-6361/201117691.S2CID55586789.
- ^Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood".Astronomy Letters.38(12): 771–782.arXiv:1606.08814.Bibcode:2012AstL...38..771G.doi:10.1134/S1063773712120031.ISSN0320-0108.S2CID255201789.
- ^"iot Lyr".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-09-04.
- ^Abt, H. A.; Cardona, O. (October 1984), "Be stars in binaries",Astrophysical Journal,285:190–194,Bibcode:1984ApJ...285..190A,doi:10.1086/162490