| 词条 | Pi1 Cygni |
| 释义 |
| name = Pi¹ Cygni }}{{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Cygnus | ra = {{RA|21|42|05.66458}}[1] | dec = {{DEC|+51|11|22.6415}}[1] | appmag_v = 4.66[3] }}{{Starbox character | class = B3 IV[4] | b-v = −0.11[3] | u-b = | r-i = | variable = }}{{Starbox astrometry | radial_v = | prop_mo_ra = +5.29[1] | prop_mo_dec = −1.78[1] | parallax = 1.89 | p_error = 0.15 | parallax_footnote = [1] | absmag_v = −3.91[9] }}{{Starbox orbit | reference = [10] | period_unitless = 26.33 d | eccentricity = 0.00 | periastron = {{nowrap|2431306.5 ± 10.0 JD}} | periarg = 0.00 | k1 = 16.5 }}{{Starbox detail | source = | component1 = π¹ Cyg A | mass = {{Val|10.1|0.1}}[4] | radius = 5.6[12] | luminosity = 16,538[13] | temperature = {{Val|18360|1100|fmt=commas}}[3] | gravity = | metal_fe = | rotational_velocity = 55[15] | age_myr = {{Val|25.1|0.8}}[4] }}{{Starbox catalog | names = π¹ Cyg, 80 Cygni, BD+50° 3410, FK5 3733, HD 206672, HIP 107136, HR 8301, SAO 33665.[17] }}{{Starbox reference | Simbad = pi.01+Cyg }}{{Starbox end}} Pi¹ Cygni (π¹ Cygni, abbreviated Pi¹ Cyg, π¹ Cyg) is a binary star[10] in the northern constellation of Cygnus. It is visible to the naked eye, having a combined apparent visual magnitude of 4.66.[3] The distance to this system can be roughly gauged by its annual parallax shift of 1.89 mas,[1] which yields a separation of around 1,700 light years from the Sun, give or take a hundred light years. The two components are designated Pi¹ Cygni A (also named Azelfafage) and B. Nomenclatureπ¹ Cygni (Latinised to Pi¹ Cygni) is the star's Bayer designation. The designations of the two components as Pi¹ Cygni A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[1]It bore the traditional name Azelfafage, derived from the Arabic ظلف الفرس Dhilf al-faras meaning "the horse track" or (probably) ذيل الدجاجة Dhail al-dajājah meaning "the tail of hen".[2] In 2016, the IAU organized a Working Group on Star Names (WGSN)[3] to catalogue and standardize proper names for stars. The WGSN approved the name Azelfafage for Pi¹ Cygni on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. For such names relating to members of multiple star systems, and where a component letter is not explicitly listed, the WGSN says that the name should be understood to be attributed to the brightest component by visual brightness[4] - in this case Pi¹ Cygni A. In Chinese, {{lang|zh|螣蛇}} ({{lang|zh-Latn|Téng Shé}}), meaning Flying Serpent, refers to an asterism consisting of Pi¹ Cygni, Alpha Lacertae, 4 Lacertae, Pi² Cygni, HD 206267, Epsilon Cephei, Beta Lacertae, Sigma Cassiopeiae, Rho Cassiopeiae, Tau Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, Lambda Andromedae, Kappa Andromedae, Psi Andromedae and Iota Andromedae. Consequently, Pi¹ Cygni itself is known as {{lang|zh|螣蛇四}} ({{lang|zh-Latn|Téng Shé sì}}, {{lang-en|the Fourth Star of Flying Serpent}})[5] PropertiesThis is a single-lined spectroscopic binary with a close, circular orbit, having a period of just 26.33 days. The primary, component A, is a slightly evolved B-type subgiant star with a stellar classification of B3 IV.[4] It has an estimated 10 times the mass of the Sun and around 5.6[12] times the Sun's radius. The star radiates 16,538[13] times the solar luminosity from its outer atmosphere at an effective temperature of roughly 18,360 K.[3] It is about 25[4] million years old and is spinning with a projected rotational velocity of 55 km/s.[15] References1. ^{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }} [6][7][8][9][10][11][12][13][14]2. ^p. 197, [https://books.google.com/books?id=5xQuAAAAIAAJ Star-names and Their Meanings], Richard Hinckley Allen, New York, G. E. Stechert, 1899. 3. ^{{citation | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN) | publisher=International Astronomical Union | accessdate=22 May 2016 | postscript=. }} 4. ^{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin2.pdf | title=Bulletin of the IAU Working Group on Star Names, No. 2 |accessdate=16 December 2017}} 5. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 6. ^1 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }} 7. ^1 2 3 4 5 6 {{citation | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. }} 8. ^1 2 {{citation | display-authors=1 | last1=Hohle | first1=M. M. | last2=Neuhäuser | first2=R. | last3=Schutz | first3=B. F. | title=Masses and luminosities of O- and B-type stars and red supergiants | journal=Astronomische Nachrichten | volume=331 | issue=4 | page=349 |date=April 2010 | doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H | arxiv=1003.2335 | postscript=. }} 9. ^1 2 {{citation | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) | edition=3rd | journal=Astronomy and Astrophysics | display-authors=1 | volume=367 | issue=2 | pages=521–524 | date=February 2001 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | postscript=. }} 10. ^1 2 3 4 5 {{citation | last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A. | title=The PASTEL catalogue of stellar parameters | journal=Astronomy and Astrophysics | display-authors=1 | volume=515 | page=A111 | date=June 2010 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. |arxiv = 1004.1069 }} 11. ^1 2 {{citation | title=SB9: The ninth catalogue of spectroscopic binary orbits | journal=Astronomy & Astrophysics | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | volume=424 | issue=2 | pages=727 | date=2004 | doi=10.1051/0004-6361:20041213 | bibcode=2004A&A...424..727P | arxiv=astro-ph/0406573 | postscript=. }} 12. ^1 2 {{citation | display-authors=1 | last1=Strom | first1=Stephen E. | last2=Wolff | first2=Sidney C. | last3=Dror | first3=David H. A. | title=B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch? | journal=The Astronomical Journal | volume=129 | issue=2 | pages=809–828 | date=2005 | bibcode=2005AJ....129..809S | doi=10.1086/426748 | arxiv=astro-ph/0410337 | postscript=. }} 13. ^1 2 3 4 5 {{citation | display-authors=1 | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 | date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | bibcode=2011MNRAS.410..190T | arxiv=1007.4883 | postscript=. }} 14. ^1 {{citation | title=pi.01 Cyg -- Spectroscopic binary | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=pi01+Cyg | accessdate=2017-02-19 | postscript=. }} }}{{Stars of Cygnus|state=collapsed}} 10 : B-type subgiants|Spectroscopic binaries|Cygnus (constellation)|Bayer objects|Stars with proper names|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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