The system is a visual binary, where the orbit is calculated from observations of one star orbiting the other. The primary, Gamma Coronae Australis A, is a late F-type main-sequence star with an effective temperature of 6,090 K.[6] It has an absolute an absolute magnitude of +3.73, and a mass of 1.15 solar masses.[6] The secondary, Gamma Coronae Australis B, is also F-type. With an effective temperature of 6,100 K, an absolute magnitude of +3.80, and a mass of 1.14 solar masses, the companion is almost identical to the primary.[6] Gamma Coronae Australis has been known to be a binary for a long time, and its two components have been given Henry Draper Catalogue designations of HD 177474[8] and HD 177475,[9] respectively. The two stars are separated by 1.896″ and orbit each other every 121.76 years.[7]
References
^ abcdefvan 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. S2CID 18759600.
^Eggl, S.; Pilat-Lohinger, E.; Funk, B.; Georgakarakos, N.; Haghighipour, N. (2012). "Circumstellar habitable zones of binary-star systems in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 428 (4): 3104. arXiv:1210.5411. Bibcode:2013MNRAS.428.3104E. doi:10.1093/mnras/sts257.
^ abMermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^Gontcharov, G. A. (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. S2CID 119231169.
^ abcdefFuhrmann, K.; Chini, R. (2015). "Multiplicity Among F-Type Stars. II". The Astrophysical Journal. 809: 107. Bibcode:2015ApJ...809..107F. doi:10.1088/0004-637X/809/1/107.
^ ab"Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 20 June 2017.
gamma, coronae, australis, binary, star, located, constellation, corona, australis, system, combined, apparent, visual, magnitude, making, faintly, visible, naked, located, light, years, parsecs, from, based, parallax, member, milky, thin, disk, coronae, austr. Gamma Coronae Australis g CrA is a binary star located in the constellation Corona Australis The system has a combined apparent visual magnitude of 4 20 2 making it faintly visible to the naked eye It is located 56 4 light years 17 3 parsecs from the Sun based on its parallax 1 Gamma Coronae Australis is a member of the Milky Way s thin disk 6 g Coronae Australis Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Corona AustralisRight ascension 19h 06m 25 11014s 1 Declination 37 03 48 3901 1 Apparent magnitude V 4 20 2 CharacteristicsSpectral type F8V F8V 3 U B color index 0 51 4 B V color index 0 01 4 AstrometryRadial velocity Rv 51 60 0 3 5 km sProper motion m RA 96 74 1 05 1 mas yr Dec 281 71 0 58 1 mas yrParallax p 57 79 0 75 mas 1 Distance56 4 0 7 ly 17 3 0 2 pc Absolute magnitude MV 3 73 3 80 6 Orbit 7 Period P 121 76 yrSemi major axis a 1 896 Eccentricity e 0 320Inclination i 149 6 Longitude of the node W 50 3 Periastron epoch T 2000 64Argument of periastron w secondary 349 0 Details 6 g CrA AMass1 15 M Radius1 47 R Surface gravity log g 4 17 cgsTemperature6 090 KMetallicity Fe H 0 07 dexAge5 Gyrg CrA BMass1 14 M Radius1 42 R Surface gravity log g 4 19 cgsTemperature6 100 KMetallicity Fe H 0 07 dexAge5 GyrOther designationsg CrA CD 37 13048 HIP 93825 SAO 210928 CCDM J19064 3704AB 2 g CrA A HD 177474 HR 7226 8 g CrA B HD 177475 HR 7227 9 Database referencesSIMBADg CrAg CrA Ag CrA BThe system is a visual binary where the orbit is calculated from observations of one star orbiting the other The primary Gamma Coronae Australis A is a late F type main sequence star with an effective temperature of 6 090 K 6 It has an absolute an absolute magnitude of 3 73 and a mass of 1 15 solar masses 6 The secondary Gamma Coronae Australis B is also F type With an effective temperature of 6 100 K an absolute magnitude of 3 80 and a mass of 1 14 solar masses the companion is almost identical to the primary 6 Gamma Coronae Australis has been known to be a binary for a long time and its two components have been given Henry Draper Catalogue designations of HD 177474 8 and HD 177475 9 respectively The two stars are separated by 1 896 and orbit each other every 121 76 years 7 References Edit a b c d e f van Leeuwen F November 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 gam CrA SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 20 June 2017 Eggl S Pilat Lohinger E Funk B Georgakarakos N Haghighipour N 2012 Circumstellar habitable zones of binary star systems in the solar neighbourhood Monthly Notices of the Royal Astronomical Society 428 4 3104 arXiv 1210 5411 Bibcode 2013MNRAS 428 3104E doi 10 1093 mnras sts257 a b Mermilliod J C 1986 Compilation of Eggen s UBV data transformed to UBV unpublished Catalogue of Eggen s UBV Data Bibcode 1986EgUBV 0M Gontcharov G A 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 S2CID 119231169 a b c d e f Fuhrmann K Chini R 2015 Multiplicity Among F Type Stars II The Astrophysical Journal 809 107 Bibcode 2015ApJ 809 107F doi 10 1088 0004 637X 809 1 107 a b Sixth Catalog of Orbits of Visual Binary Stars United States Naval Observatory Retrieved 20 June 2017 a b gam CrA A SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 20 June 2017 a b gam CrA B SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 20 June 2017 Retrieved from https en wikipedia org w index php title Gamma Coronae Australis amp oldid 1079520208, wikipedia, wiki, book, books, library,
