The secondary member, component B, is a magnitude 6.04 star, while the more distant component C is magnitude 9.01 and lies at an angular separation of 8.330 arc seconds from the other two.[3]
^ abcdefvan Leeuwen, F. (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, S2CID 18759600.
^ abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
^ abcdEggleton, 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, S2CID 14878976.
^ abCowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
^Christy, James W.; Walker, R. L. Jr. (October 1969), "MK Classification of 142 Visual Binaries", Publications of the Astronomical Society of the Pacific, 81 (482): 643, Bibcode:1969PASP...81..643C, doi:10.1086/128831.
^ abMuterspaugh, Matthew W.; et al. (December 2010), "The Phases Differential Astrometry Data Archive. II. Updated Binary Star Orbits and a Long Period Eclipsing Binary", The Astronomical Journal, 140 (6): 1623–1630, arXiv:1010.4043, Bibcode:2010AJ....140.1623M, doi:10.1088/0004-6256/140/6/1623, S2CID 6030289.
^ abcdDavid, 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^McDonald, I.; et al. (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, S2CID 118665352.
^ abBelle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
^(in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日
External linksedit
Kaler, James B. (August 3, 2012), "Zeta Sagittae", stars, University of Illinois, retrieved 2017-07-13.
January 01, 1970
zeta, sagittae, sagittae, triple, star, system, northern, constellation, sagitta, visible, naked, having, combined, apparent, visual, magnitude, based, upon, annual, parallax, shift, distance, this, star, approximately, light, years, location, sagittae, circle. Zeta Sagittae z Sagittae is triple star 3 system in the northern constellation of Sagitta It is visible to the naked eye having a combined apparent visual magnitude of 5 00 2 Based upon an annual parallax shift of 12 79 mas 1 the distance to this star is approximately 260 light years Zeta SagittaeLocation of z Sagittae circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Sagitta Right ascension 19h 48m 58 65978s 1 Declination 19 08 31 3516 1 Apparent magnitude V 5 00 2 5 64 6 04 9 01 3 Characteristics Spectral type A3 Vnn 4 A1 V A3 V 5 U B color index 0 06 2 B V color index 0 10 2 AstrometryProper motion m RA 17 63 1 mas yr Dec 26 27 1 mas yrParallax p 12 79 0 67 mas 1 Distance260 10 ly 78 4 pc Absolute magnitude MV 0 55 6 Orbit 7 Period P 8487 9 4 9 dSemi major axis a 0 13605 0 00044 Eccentricity e 0 7948 0 0019Inclination i 132 33 0 41 Longitude of the node W 340 97 0 68 Periastron epoch T 44199 6 5 9 HMJDArgument of periastron w secondary 355 3 1 0 Detailsz Sge AMass1 80 8 M Radius1 7 9 R Luminosity46 10 L Surface gravity log g 3 89 8 cgsTemperature8 422 286 8 KRotational velocity v sin i 240 11 km sAge347 8 Myr Other designationsz Sge 8 Sge BD 19 4229 GC 27431 HD 187362 HIP 97496 HR 7546 SAO 105298 PPM 137034 ADS 12973 WDS J19490 1909AB 12 Database referencesSIMBADdata The inner pair is a visual binary system consisting of two A type main sequence stars with an orbital period of 23 2 years 8 487 9 d a semimajor axis of 0 136 arc seconds and an eccentricity of 0 79 7 The primary component A has a visual magnitude of 5 64 3 with a stellar classification of A3 Vnn 4 where the nn suffix indicates nebulous lines due to rotation It is spinning rapidly with a projected rotational velocity of 240 km s This is giving the star an oblate shape with an equatorial bulge that is 14 larger than the polar radius 11 The secondary member component B is a magnitude 6 04 star while the more distant component C is magnitude 9 01 and lies at an angular separation of 8 330 arc seconds from the other two 3 Naming editIn Chinese 左旗 Zuǒ Qi meaning Left Flag refers to an asterism consisting of z Sagittae a Sagittae b Sagittae d Sagittae g Sagittae 13 Sagittae 11 Sagittae 14 Sagittae and r Aquilae Consequently the Chinese name for z Sagittae itself is 左旗四 Zuǒ Qi si English the Fourth Star of Left Flag 13 References edit a b c d e f van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Johnson H L et al 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 99 Bibcode 1966CoLPL 4 99J a b c d 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 arXiv 0806 2878 Bibcode 2008MNRAS 389 869E doi 10 1111 j 1365 2966 2008 13596 x S2CID 14878976 a b Cowley A et al April 1969 A study of the bright A stars I A catalogue of spectral classifications Astronomical Journal 74 375 406 Bibcode 1969AJ 74 375C doi 10 1086 110819 Christy James W Walker R L Jr October 1969 MK Classification of 142 Visual Binaries Publications of the Astronomical Society of the Pacific 81 482 643 Bibcode 1969PASP 81 643C doi 10 1086 128831 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 S2CID 119257644 a b Muterspaugh Matthew W et al December 2010 The Phases Differential Astrometry Data Archive II Updated Binary Star Orbits and a Long Period Eclipsing Binary The Astronomical Journal 140 6 1623 1630 arXiv 1010 4043 Bibcode 2010AJ 140 1623M doi 10 1088 0004 6256 140 6 1623 S2CID 6030289 a b c d David Trevor J Hillenbrand Lynne A 2015 The Ages of Early Type Stars Stromgren Photometric Methods Calibrated Validated Tested and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets The Astrophysical Journal 804 2 146 arXiv 1501 03154 Bibcode 2015ApJ 804 146D doi 10 1088 0004 637X 804 2 146 S2CID 33401607 Pasinetti Fracassini L E et al February 2001 Catalogue of Apparent Diameters and Absolute Radii of Stars CADARS Astronomy and Astrophysics 367 Third ed 521 524 arXiv astro ph 0012289 Bibcode 2001A amp A 367 521P doi 10 1051 0004 6361 20000451 S2CID 425754 McDonald I et al 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 S2CID 118665352 a b Belle G T 2012 Interferometric observations of rapidly rotating stars The Astronomy and Astrophysics Review 20 1 51 arXiv 1204 2572 Bibcode 2012A amp ARv 20 51V doi 10 1007 s00159 012 0051 2 S2CID 119273474 zet Sge SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 07 11 in Chinese AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 7 月 3 日External links editKaler James B August 3 2012 Zeta Sagittae stars University of Illinois retrieved 2017 07 13 Retrieved from https en wikipedia org w index php title Zeta Sagittae amp oldid 1215919810, wikipedia, wiki, book, books, library,
