Theta Lyrae (θ Lyr) is a star in a trinary star system, in the constellation Lyra, approximately 770 light years away from Earth. Theta Lyrae is an orange bright giant star of the spectral type K0II, which means that it possesses a surface temperature of about 5,000 kelvins, and is many times bigger and brighter, yet cooler, than the Sun.[3]
It is orbited by a subsystem composed of BD+37° 3399 and BD+37° 3399B. 10th magnitude BD+37° 3399 is a giant star with a spectral type of K2III. It is therefore almost the same temperature as Theta Lyrae, but smaller and dimmer.[4] BD+37° 3399B is an 11th magnitude star of an unknown spectral type.[5]
References
^ abcdefCarney, 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, S2CID 2756572
^Nordgren, Tyler E.; et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal, 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114
theta, lyrae, star, trinary, star, system, constellation, lyra, approximately, light, years, away, from, earth, orange, bright, giant, star, spectral, type, k0ii, which, means, that, possesses, surface, temperature, about, kelvins, many, times, bigger, brighte. Theta Lyrae 8 Lyr is a star in a trinary star system in the constellation Lyra approximately 770 light years away from Earth Theta Lyrae is an orange bright giant star of the spectral type K0II which means that it possesses a surface temperature of about 5 000 kelvins and is many times bigger and brighter yet cooler than the Sun 3 Theta Lyrae Observation dataEpoch J2000 0 Equinox J2000 0Constellation LyraRight ascension 19h 16m 22 0951s 19h 16m 30 069s 19h 16m 28 7sDeclination 38 8 1 431 38 8 35 80 38 7 1 Apparent magnitude V 4 347 9 5 11 0CharacteristicsSpectral type K0II 1 K2III U B color index 1 23B V color index 1 25AstrometryRadial velocity Rv 30 9 km sProper motion m RA 0 49 mas yr Dec 1 23 14 0 mas yrParallax p 4 24 0 49 masDistanceapprox 770 ly approx 240 pc Absolute magnitude MV 2 76 0 27 0 24 1 Details8 LyrRadius57 7 2 R Surface gravity log g 1 93 1 cgsTemperature4500 1 KMetallicity Fe H 0 01 1 dexRotational velocity v sin i 3 6 1 4 1 km sOther designations8 Lyrae 21 Lyrae HR 7314 BD 37 3398 HD 180809 SAO 68065 HIP 94713 GC 26585 IDS 19129 3757 GSC 03121 02287 BD 37 3399 BD 37 3399B 3 4 5 Database referencesSIMBADdataIt is orbited by a subsystem composed of BD 37 3399 and BD 37 3399B 10th magnitude BD 37 3399 is a giant star with a spectral type of K2III It is therefore almost the same temperature as Theta Lyrae but smaller and dimmer 4 BD 37 3399B is an 11th magnitude star of an unknown spectral type 5 References Edit a b c d e f 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 S2CID 2756572 Nordgren Tyler E et al December 1999 Stellar Angular Diameters of Late Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer The Astronomical Journal 118 6 3032 3038 Bibcode 1999AJ 118 3032N doi 10 1086 301114 a b tet Lyr SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved October 15 2007 a b BD 37 3399 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved October 15 2007 a b Simbad Query Result SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved October 15 2007 Retrieved from https en wikipedia org w index php title Theta Lyrae amp oldid 1154750081, wikipedia, wiki, book, books, library,
