φ Cygni is a double-lined spectroscopic binary system, which means that the absorption lines of both components are visible in the spectrum. The two sets of spectral lines are almost identical and both stars are assigned a spectral type of K0III, meaning they have evolved into giants. They are considered to be red clump giants, stars that have begun core helium fusion and lie on the horizontal branch but because of their metallicity and the size of their hydrogen envelope they are found very close to the red giant branch.[8][12] The two stars are assumed to have the same age, which would be around 650 million years.[9][6] The pair have an orbital period of 434.208 days, or 1.2 Earth years, a semimajor axis of 26.9 mas, and a high eccentricity of 0.56.[7]
References
^ 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. Vizier catalog entry
^ abcdFernie, J. D. (June 1969), "UBV observations of miscellaneous stars", Journal of the Royal Astronomical Society of Canada, 63: 133–135, Bibcode:1969JRASC..63..133F.
^ abcdePourbaix, D (2000). "Resolved double-lined spectroscopic binaries: A neglected source of hypothesis-free parallaxes and stellar masses". Astronomy and Astrophysics Supplement. 145 (2): 215–222. Bibcode:2000A&AS..145..215P. doi:10.1051/aas:2000237.
^ abPourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
^ abArmstrong, J. T; Hummel, C. A; Quirrenbach, A; Buscher, D. F; Mozurkewich, D; Vivekanand, M; Simon, R. S; Denison, C. S; Johnston, K. J; Pan, X.-P; Shao, M; Colavita, M. M (1992). "The orbit of Phi Cygni measured with long-baseline optical interferometry - Component masses and absolute magnitudes". Astronomical Journal. 104: 2217. Bibcode:1992AJ....104.2217A. doi:10.1086/116396.
^ abcdefghijklmnopMassarotti, Alessandro; Latham, David W; Stefanik, Robert P; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
^ abcFekel, F. C (2004). "The Spectroscopic Orbit of φ Cygni, a System with Two Late-Type Giants". The Environment and Evolution of Double and Multiple Stars. 21: 63. Bibcode:2004RMxAC..21...63F.
^ abSoubiran, C; Bienaymé, O; Mishenina, T. V; Kovtyukh, V. V (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics. 480 (1): 91–101. arXiv:0712.1370. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788. S2CID 16602121.
^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 Vizier catalog entry
^Armstrong, J. T; Hummel, C. A; Quirrenbach, A; Buscher, D. F; Mozurkewich, D; Vivekanand, M; Simon, R. S; Denison, C. S; Johnston, K. J; Pan, X.-P; Shao, M; Colavita, M. M (1992). "The orbit of Phi Cygni measured with long-baseline optical interferometry - Component masses and absolute magnitudes". Astronomical Journal. 104: 2217. arXiv:1304.2530. Bibcode:1992AJ....104.2217A. doi:10.1086/116396.
March 11, 2023
cygni, latinized, from, cygni, binary, star, system, northern, constellation, cygnus, faintly, visible, naked, with, apparent, visual, magnitude, annual, parallax, shift, measured, from, earth, which, yields, distance, estimate, around, light, years, moving, f. Phi Cygni Latinized from f Cygni is a binary star 11 system in the northern constellation of Cygnus It is faintly visible to the naked eye with an apparent visual magnitude of 4 70 2 The annual parallax shift is 12 25 mas 1 as measured from Earth which yields a distance estimate of around 266 light years It is moving further from the Sun with a radial velocity of 4 5 km s 4 f CygniLocation of f Cygni circled Observation dataEpoch J2000 Equinox J2000Constellation CygnusRight ascension 19h 39m 22 60591s 1 Declination 30 09 11 9604 1 Apparent magnitude V 4 70 2 5 31 5 6 3 CharacteristicsSpectral type K0III K0III 3 U B color index 0 81 2 B V color index 0 98 2 AstrometryRadial velocity Rv 4 50 4 km sProper motion m RA 2 48 1 mas yr Dec 36 50 1 mas yrParallax p 12 25 0 24 mas 1 Distance266 5 ly 82 2 pc Absolute magnitude MV 0 12 5 0 77 1 07 6 OrbitPeriod P 434 208 7 daysSemi major axis a 26 9 3 mas Eccentricity e 0 5557 7 Inclination i 80 8 3 Longitude of the node W 251 3 Periastron epoch T 2451239 58 7 Argument of periastron w secondary 209 41 7 Semi amplitude K1 primary 26 40 7 km sSemi amplitude K2 secondary 27 22 7 km sDetailsAMass2 16 8 M Radius8 9 7 R Luminosity44 7 L Temperature4 875 7 KMetallicity Fe H 0 11 7 dexRotational velocity v sin i 4 7 7 km sBMass2 06 8 M Radius7 8 7 R Luminosity34 7 L Temperature4 875 7 KRotational velocity v sin i 4 8 7 km sAge0 65 9 GyrOther designationsf Cygni 12 Cygni BD 29 3684 GC 27203 HD 185734 HIP 96683 HR 7478 SAO 68637 WDS J19394 3009AB 10 Database referencesSIMBADdataf Cygni is a double lined spectroscopic binary system which means that the absorption lines of both components are visible in the spectrum The two sets of spectral lines are almost identical and both stars are assigned a spectral type of K0III meaning they have evolved into giants They are considered to be red clump giants stars that have begun core helium fusion and lie on the horizontal branch but because of their metallicity and the size of their hydrogen envelope they are found very close to the red giant branch 8 12 The two stars are assumed to have the same age which would be around 650 million years 9 6 The pair have an orbital period of 434 208 days or 1 2 Earth years a semimajor axis of 26 9 mas and a high eccentricity of 0 56 7 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 Vizier catalog entry a b c d Fernie J D June 1969 UBV observations of miscellaneous stars Journal of the Royal Astronomical Society of Canada 63 133 135 Bibcode 1969JRASC 63 133F a b c d e Pourbaix D 2000 Resolved double lined spectroscopic binaries A neglected source of hypothesis free parallaxes and stellar masses Astronomy and Astrophysics Supplement 145 2 215 222 Bibcode 2000A amp AS 145 215P doi 10 1051 aas 2000237 a b Pourbaix D et al 2004 SB9 The Ninth Catalogue of Spectroscopic Binary Orbits Astronomy amp Astrophysics 424 2 727 732 arXiv astro ph 0406573 Bibcode 2004A amp A 424 727P doi 10 1051 0004 6361 20041213 S2CID 119387088 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 Armstrong J T Hummel C A Quirrenbach A Buscher D F Mozurkewich D Vivekanand M Simon R S Denison C S Johnston K J Pan X P Shao M Colavita M M 1992 The orbit of Phi Cygni measured with long baseline optical interferometry Component masses and absolute magnitudes Astronomical Journal 104 2217 Bibcode 1992AJ 104 2217A doi 10 1086 116396 a b c d e f g h i j k l m n o p Massarotti Alessandro Latham David W Stefanik Robert P Fogel Jeffrey 2008 Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity The Astronomical Journal 135 1 209 231 Bibcode 2008AJ 135 209M doi 10 1088 0004 6256 135 1 209 a b c Fekel F C 2004 The Spectroscopic Orbit of f Cygni a System with Two Late Type Giants The Environment and Evolution of Double and Multiple Stars 21 63 Bibcode 2004RMxAC 21 63F a b Soubiran C Bienayme O Mishenina T V Kovtyukh V V 2008 Vertical distribution of Galactic disk stars IV AMR and AVR from clump giants Astronomy and Astrophysics 480 1 91 101 arXiv 0712 1370 Bibcode 2008A amp A 480 91S doi 10 1051 0004 6361 20078788 S2CID 16602121 phi Cyg SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2016 04 10 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 Vizier catalog entry Armstrong J T Hummel C A Quirrenbach A Buscher D F Mozurkewich D Vivekanand M Simon R S Denison C S Johnston K J Pan X P Shao M Colavita M M 1992 The orbit of Phi Cygni measured with long baseline optical interferometry Component masses and absolute magnitudes Astronomical Journal 104 2217 arXiv 1304 2530 Bibcode 1992AJ 104 2217A doi 10 1086 116396 Retrieved from https en wikipedia org w index php title Phi Cygni amp oldid 1079520707, wikipedia, wiki, book, books, library,
