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Phi Cygni

From Wikipedia, the free encyclopedia
Star in the constellation Cygnus
φ Cygni
Location of φ Cygni (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationCygnus
Right ascension19h 39m 22.60591s[1]
Declination30° 09′ 11.9604″[1]
Apparent magnitude (V)4.70[2](5.31 + 5.6)[3]
Characteristics
Spectral typeG8III + G8III[4]
U−Bcolor index+0.81[2]
B−Vcolor index+0.98[2]
Astrometry
Radial velocity (Rv)+4.50[5] km/s
Proper motion (μ)RA: +2.48mas/yr[1]
Dec.: +36.50mas/yr[1]
Parallax (π)14.9244±0.4176 mas[4]
Distance219 ± 6 ly
(67 ± 2 pc)
Absolute magnitude (MV)+0.12[6](+0.77/+1.07)[7]
Orbit
Period (P)434.208[8] days
Semi-major axis (a)26.9[3] mas″
Eccentricity (e)0.5557[8]
Inclination (i)80.8[3]°
Longitude of the node (Ω)251[3]°
Periastronepoch (T)2451239.58[8]
Argument of periastron (ω)
(secondary)		209.41[8]°
Semi-amplitude (K1)
(primary)		26.40[8] km/s
Semi-amplitude (K2)
(secondary)		27.22[8] km/s
Details[4]
A
Mass2.104±0.049 M☉
Radius7.46[a] R☉
Luminosity34.7+2.5
−2.3 L☉
Temperature5,130±120 K
Metallicity [Fe/H]−0.11[8] dex
Rotational velocity (v sin i)4.7[8] km/s
Age479+58
−52 Myr
B
Mass2.040±0.042 M☉
Radius7.04[b] R☉
Luminosity28±3 L☉
Temperature5,010 K
Rotational velocity (v sin i)4.8[8] km/s
Age562+69
−61 Myr
Other designations
φ Cygni,12 Cygni,BD+29° 3684,GC 27203,HD 185734,HIP 96683,HR 7478,SAO 68637,WDS J19394+3009AB[9]
Database references
SIMBADdata

Phi Cygni,Latinized fromφ Cygni, is abinary star[10] system in the northernconstellation ofCygnus. It is faintly visible to the naked eye with anapparent visual magnitude of 4.70.[2] The annualparallax shift is 14.92 mas[4] as measured from Earth, which yields a distance estimate of around 220 light years. It is moving further from the Sun with aradial velocity of +4.5 km/s.[5]

φ Cygni is a double-linedspectroscopic binary system, which means that theabsorption lines of both components are visible in thespectrum. The two sets of spectral lines are almost identical and both stars are assigned a spectral type of K0III, meaning they have evolved intogiants. They are considered to bered clump giants, stars that have begun core helium fusion and lie on thehorizontal branch but because of theirmetallicity and the size of their hydrogen envelope they are found very close to thered giant branch.[11][12] The two stars are assumed to have the same age, which would be around 650 million years.[13][7] The pair have anorbital period of 434.208 days, or 1.2 Earth years, asemimajor axis of 26.9 mas, and a higheccentricity of 0.56.[8]

Notes

[edit]
  1. ^Calculated, using theStefan-Boltzmann law and the star'seffective temperature and luminosity, with respect to thesolar nominal effective temperature of 5,772 K:(5,772103.71)4⋅101.53=7.46 R⊙.{\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{10^{3.71}}}{\biggr )}^{4}\cdot 10^{1.53}}}=7.46\ R_{\odot }.}
  2. ^Calculated, using theStefan-Boltzmann law and the star'seffective temperature and luminosity, with respect to thesolar nominal effective temperature of 5,772 K:(5,772103.70)4⋅101.45=7.04 R⊙.{\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{10^{3.70}}}{\biggr )}^{4}\cdot 10^{1.45}}}=7.04\ R_{\odot }.}

References

[edit]
  1. ^abcvan 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
  2. ^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.
  3. ^abcdPourbaix, 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.
  4. ^abcdPiccotti, Luca; Docobo, José Ángel; Carini, Roberta; Tamazian, Vakhtang S.; Brocato, Enzo; Andrade, Manuel; Campo, Pedro P. (2020-02-01), "A study of the physical properties of SB2s with both the visual and spectroscopic orbits",Monthly Notices of the Royal Astronomical Society,492 (2):2709–2721,Bibcode:2020MNRAS.492.2709P,doi:10.1093/mnras/stz3616,ISSN 0035-8711Phi Cygni's database entry atVizieR.
  5. ^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.
  6. ^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.
  7. ^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.
  8. ^abcdefghijMassarotti, 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.
  9. ^"* phi Cyg".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2016-04-10.
  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 14878976Vizier catalog entry
  11. ^Fekel, 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.
  12. ^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.
  13. ^Soubiran, 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.
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