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● H e l p ● L e a r n t o e d i t ● C o m m u n i t y p o r t a l ● R e c e n t c h a n g e s ● U p l o a d f i l e
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P a g e s f o r l o g g e d o u t e d i t o r s l e a r n m o r e ● C o n t r i b u t i o n s ● T a l k
( T o p )
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A p p e a r a n c e
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
Binary star system in the constellation Cygnus
Pi 1
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation
Cygnus
Right ascension 21 h 42 m s [1]
Declination
+51° 11 ′ 22.6415″[1]
Apparent magnitude (V )4.66[2]
Characteristics
Spectral type
B3 IV [3]
B−V color index
−0.11[2]
Astrometry Proper motion (μ) RA: +5.29[1] mas /yr Dec.: −1.78[1] mas /yr Parallax (π)1.89 ± 0.15 mas [1] Distance 1,700 ± 100 ly pc Absolute magnitude (M V −3.91[4] Orbit [5] Period (P )26.33 d Eccentricity (e )0.00 Periastron epoch (T )2431306.5 ± 10.0 JD Argument of periastron (ω)0.00° Semi-amplitude K 1 16.5 km/s Details π1 Mass ± 0.1[3] M ☉ Radius 5.6[6] R ☉ Luminosity 16,538[7] L ☉ Temperature ± 1,100[2] K Rotational velocity (v i 55 [8] Age ± 0.8[3] Myr Other designations
π1 , 80 BD FK5 3733, HD HIP 107136, HR SAO 33665.[9]
Database references SIMBAD data
Pi 1 π1 , abbreviated Pi 1 π1 ) is a binary star [5] constellation of Cygnus . It is visible to the naked eye, having a combined apparent visual magnitude of 4.66.[2] parallax shift of 1.89 mas ,[1] light years from the Sun , give or take a hundred light years.
The two components are designated Pi1 Azelfafage , the traditional name for the system)[10]
Nomenclature [ edit ]
π1 (Latinised to Pi 1 Bayer designation . The designations of the two components as Pi 1 B multiple star systems , and adopted by the International Astronomical Union (IAU).[11]
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".[12] Working Group on Star Names (WGSN)[13] Azelfafage for Pi1 [10] [14] 1
In Chinese , 螣蛇 Téng Shé Flying Serpent asterism consisting of Pi1 Alpha Lacertae , 4 Lacertae , Pi 2 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, the Chinese name for Pi1 螣蛇四 Téng Shé sì the Fourth Star of Flying Serpent )[15]
Properties [ edit ]
This 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.[3] mass of the Sun and around 5.6[6] Sun's radius . The star radiates 16,538[7] solar luminosity from its outer atmosphere at an effective temperature of roughly 18,360 K.[2] [3] projected rotational velocity of 55 km/s.[8]
References [ edit ]
^ a b c d e Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1 ): 190–200, arXiv :1007.4883 Bibcode :2011MNRAS.410..190T , doi :10.1111/j.1365-2966.2010.17434.x , S2CID 118629873 .
^ 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 Pourbaix, D.; et al. (2004), "SB 9 Astronomy & Astrophysics , 424 (2 ): 727–732, arXiv :astro-ph/0406573 Bibcode :2004A&A...424..727P , doi :10.1051/0004-6361:20041213 , S2CID 119387088 .
^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (2 ) (3rd ed.): 521–524, arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 .
^ a b Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten , 331 (4 ): 349, arXiv :1003.2335 Bibcode :2010AN....331..349H , doi :10.1002/asna.200911355 , S2CID 111387483 .
^ a b Strom, Stephen E.; et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal , 129 (2 ): 809–828, arXiv :astro-ph/0410337 Bibcode :2005AJ....129..809S , doi :10.1086/426748 , S2CID 15059129 .
^ "pi.01 Cyg -- Spectroscopic binary" , SIMBAD Astronomical Database , Centre de Données astronomiques de Strasbourg, retrieved 2017-02-19 .
^ a b "Naming Stars" . IAU.org. Retrieved 16 December 2017 .
^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv :1012.0707 astro-ph.SR ].
^ p. 197, Star-names and Their Meanings
^ IAU Working Group on Star Names (WGSN) International Astronomical Union , retrieved 22 May 2016 .
^ "Bulletin of the IAU Working Group on Star Names, No. 2" (PDF) . Retrieved 16 December 2017 .
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年7 月7 日
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Pi1_Cygni&oldid=1185654854 " C a t e g o r i e s : ● B - t y p e s u b g i a n t s ● S p e c t r o s c o p i c b i n a r i e s ● C y g n u s ( c o n s t e l l a t i o n ) ● B a y e r o b j e c t s ● S t a r s w i t h p r o p e r n a m e s ● D u r c h m u s t e r u n g o b j e c t s ● F l a m s t e e d o b j e c t s ● H e n r y D r a p e r C a t a l o g u e o b j e c t s ● H i p p a r c o s o b j e c t s ● B r i g h t S t a r C a t a l o g u e o b j e c t s H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h C h i n e s e - l a n g u a g e s o u r c e s ( zh ) ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n i s d i f f e r e n t f r o m W i k i d a t a ● A r t i c l e s c o n t a i n i n g C h i n e s e - l a n g u a g e t e x t ● A r t i c l e s c o n t a i n i n g e x p l i c i t l y c i t e d E n g l i s h - l a n g u a g e t e x t
● T h i s p a g e w a s l a s t e d i t e d o n 1 8 N o v e m b e r 2 0 2 3 , a t 0 4 : 2 1 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
