| 词条 | Xi Cygni |
| 释义 |
| name = ξ Cygni }}{{Starbox image | image={{Location mark |image=Cygnus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=ξ Cyg |x=231|y=322 }} |caption=Location of ξ Cygni (circled) }}{{Starbox observe |epoch = J2000 |constell = Cygnus |ra= {{RA|21|04|55.86}}[1] |dec= {{DEC|+43|55|40.3}}[1] |appmag_v= 3.73[1] }}{{Starbox character |class= K4:Ib- + A1.5V[4] | b-v = +1.66[1] | u-b = +1.78[1] }}{{Starbox astrometry | radial_v = -19.10[2] | prop_mo_ra = +7.97[1] | prop_mo_dec = +0.06[1] | parallax = 3.87 | p_error = 0.16 | parallax_footnote = [3] | dist_pc = 361[4] | absmag_v = −4.3/+1.3[4] }}{{Starbox orbit |reference=[5] |period_unitless=6,750 ± 200 days |eccentricity=0.25 ± 0.07 |inclination=~50 |axis_unitless=~{{solar radius|766}} }}{{Starbox detail | source = | component1 = Primary | mass = ~8[5] | temperature = 3,920[6] | gravity = 1.00[6] | metal_fe = −0.41[6] | radius = 200[5] | luminosity = 5,303[7] | component2 = Secondary | mass2 = ~2.5[5] | age_myr2 = }}{{Starbox catalog | names = 62 Cygni, FK5 792, GC 29459, HIP 104060, HR 8079, HD 200905, SAO 50424 }}{{Starbox reference | Simbad = Xi+Cygni }}{{Starbox end}} ξ Cygni (Latinised as Xi Cygni) is a spectroscopic binary star in the constellation Cygnus. Its apparent magnitude is 3.73 and it is located around {{convert|360|pc|ly}} away. The system contains two stars which orbit every 18 years in a mildly eccentric orbit. The primary star is a supergiant with a spectral type of around K4, while the secondary is a A-type main-sequence star with a spectral type of A1.5. Stellar winds from the supergiant have been measured at around 50 km/s, but with variations in speed and individual line strengths.[5] ξ Cygni is in the Kepler spacecraft's field of view but no planets have been detected.[8] {{gallery |align=center| File:XiCygni JeffJohnson.jpg|H-alpha RGB amateur image of ξ Cygni, center star, at edge of NGC7000 | File:NGC7000 North America Nebula.jpg|NGC 7000 (North America Nebula). ξ Cygni is the bright star on the left. }} References1. ^1 2 {{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|pages=0|author1=Ducati|first1=J. R.|year=2002}} {{Stars of Cygnus}}2. ^{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 }} 3. ^1 2 3 4 {{cite journal | first=F. | last=van Leeuwen | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=November 2007 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | arxiv=0708.1752}} 4. ^1 2 {{cite journal|bibcode=2002ApJS..143..513G|title=Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components|journal=The Astrophysical Journal Supplement Series|volume=143|issue=2|pages=513|author1=Ginestet|first1=N.|last2=Carquillat|first2=J. M.|year=2002|doi=10.1086/342942}} 5. ^1 2 3 4 {{cite journal|bibcode=1989A&A...214..261R|title=Observations of modulation and phase displacement of the stellar wind in six red giant spectroscopic binaries|journal=Astronomy and Astrophysics|volume=214|pages=261|author1=Reimers|first1=D.|last2=Schroeder|first2=K.-P.|year=1989}} 6. ^1 2 {{cite journal|bibcode= 2007A&A...475.1003H|title= Precise radial velocities of giant stars. III. Spectroscopic stellar parameters|journal= Astronomy and Astrophysics|volume= 475|issue= 3|pages= 1003|author1= Hekker|first1= S.|last2= Meléndez|first2= J.|year= 2007|doi= 10.1051/0004-6361:20078233|arxiv = 0709.1145 }} 7. ^{{cite journal|bibcode= 2012MNRAS.427..343M|title= Fundamental parameters and infrared excesses of Hipparcos stars|journal= Monthly Notices of the Royal Astronomical Society|volume= 427|pages= 343|author1= McDonald|first1= I.|last2= Zijlstra|first2= A. A.|last3= Boyer|first3= M. L.|year= 2012|doi= 10.1111/j.1365-2966.2012.21873.x|arxiv = 1208.2037 }} 8. ^{{cite journal|bibcode=2013MNRAS.434.1422M|title=Atmospheric parameters of 169 F-, G-, K- and M-type stars in the Kepler field|journal=Monthly Notices of the Royal Astronomical Society|volume=434|issue=2|pages=1422|author1=Molenda-Żakowicz|first1=J.|last2=Sousa|first2=S. G.|last3=Frasca|first3=A.|last4=Uytterhoeven|first4=K.|last5=Briquet|first5=M.|last6=Van Winckel|first6=H.|last7=Drobek|first7=D.|last8=Niemczura|first8=E.|last9=Lampens|first9=P.|last10=Lykke|first10=J.|last11=Bloemen|first11=S.|last12=Gameiro|first12=J. F.|last13=Jean|first13=C.|last14=Volpi|first14=D.|last15=Gorlova|first15=N.|last16=Mortier|first16=A.|last17=Tsantaki|first17=M.|last18=Raskin|first18=G.|year=2013|doi=10.1093/mnras/stt1095|arxiv = 1306.6011 }} 10 : Cygnus (constellation)|K-type supergiants|Spectroscopic binaries|Bayer objects|Hipparcos objects|HR objects|Henry Draper Catalogue objects|A-type main-sequence stars|Flamsteed objects|Durchmusterung objects |
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