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Star in the constellation Cygnus
Epsilon Cygni
Location of ε Cyg (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Cygnus
Right ascension 20 h 46 m s [1]
Declination
+33° 58 ′ 12.9250″[1]
Apparent magnitude (V )2.480[2]
Characteristics
Spectral type
K0 III[3]
U−B color index
+0.860[2]
B−V color index
+1.030[2]
Astrometry Radial velocity (R v –12.41[4] Proper motion (μ) RA: 355.66[1] mas /yr Dec.: 330.60[1] mas /yr Parallax (π)44.86 ± 0.12 mas [1] Distance 72.7 ± 0.2 ly pc Absolute magnitude (M V +0.74 ± 0.02 [3] Orbit [3] Primary ε Cyg Aa Companion ε Cyg Ab Period (P )55.1 yr Eccentricity (e )0.9 Periastron epoch (T )B2016.00 Argument of periastron (ω)300° Semi-amplitude K 1 4.0 km/s Details Mass ~2[3] M ☉ Radius +0.29 [5] R ☉ Luminosity ± 3.2[5] L ☉ Surface gravity (log g 2.8[4] cgs Temperature ± 35 [5] K Metallicity –0.27[4] dex Rotation years [3] Rotational velocity (v i 2.3 ± 0.2 [3] Age ~1.5[6] Gyr Other designations
Aljanah, Gienah,[7] BD FK5 780, GCTP 4959.00, Gl HD HIP 102488, HR LHS 5358, SAO 70474, WDS 20462+3358.[8]
Database references SIMBAD data
Epsilon Cygni (ε Cygni , abbreviated Epsilon Cyg , ε Cyg ) is multiple star system in the constellation of Cygnus . With an apparent visual magnitude of 2.48, it is readily visible to the naked eye at night as one of the brighter members of Cygnus. Based upon parallax measurement, Epsilon Cygni is about 73 light-years from the Sun .
The system has three constituents: a spectroscopic binary (designated Epsilon Cygni A); an optical companion (B ) and a single star (C ). A's two components are themselves designated Epsilon Cygni Aa (officially named Aljanah ) and Ab.
Nomenclature
[ edit ]
ε Cygni (Latinised to Epsilon Cygni ) is the system's Bayer designation . The designations of the three constituents as Epsilon Cygni A , B C A's components - Epsilon Cygni Aa and Ab multiple star systems , and adopted by the International Astronomical Union (IAU).[9]
Epsilon Cygni bore the traditional name Gienah from the Arabic al janāħ (Arabic : جناح ) meaning "the wing ".[10] Gamma Corvi .[7] Working Group on Star Names (WGSN)[11] multiple systems .[12] Aljanah for the component Epsilon Cygni Aa on 30 June 2017. It had previously approved the name Gienah for Gamma Corvi A on 6 November 2016. Both are now so included in the List of IAU-approved Star Names.[13]
In Chinese astronomy , the "Celestial Ford " (Chinese : 天津 ; pinyin : Tiān Jīn asterism consisting of Epsilon Cygni, Gamma Cygni , Delta Cygni , 30 Cygni , Alpha Cygni , Nu Cygni , Tau Cygni , Upsilon Cygni and Zeta Cygni .[14] Chinese name for Epsilon Cygni Cygni itself is "the Ninth Star of Celestial Ford" (Chinese : 天津九 ; pinyin : Tiān Jīn jiǔ [15]
Companions
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Epsilon Cygni A has an optical companion, Epsilon Cygni B, with which it is not physically associated, and a 13th magnitude candidate common proper motion companion, Epsilon Cygni C, at an angular separation of 78 arcseconds .[16] gravitationally bound to Epsilon Cygni A, then they are currently separated by 1700 AU orbital period of at least 50,000 years.[6]
Properties
[ edit ] ε Cygni appears north of the Veil nebula towards the bottom left
Epsilon Cygni A is a single-lined spectroscopic binary .[17] Radial velocity observations suggest a possible companion with an orbital period of at least 15 years.[16] giant star with a stellar classification of K0 III.[18] main sequence and has begun the final stages in its stellar evolution . The effective temperature of its photosphere is 4,660 K,[5] K-type stars.[19] solar radius and is about 65 times the luminosity of the Sun .[5]
Since 1943, the spectrum of Epsilon Cygni A has served as one of the stable anchor points by which other stars are classified.[20]
Veil Nebula
[ edit ]
ε Cygni lies about three degrees north of the Veil nebula , a probable ancient supernova remnant . The nebula is far more distant than the star.
References
[ edit ]
^ a b c Oja, T. (August 1986), "UBV photometry of stars whose positions are accurately known. III", Astronomy and Astrophysics Supplement Series , 65 2 ): 405–409, Bibcode :1986A&AS...65..405O
^ a b c d e f Gray, David F. (2015). "A Spectroscopic Analysis of the K0 III Binary ε Cygni" . The Astrophysical Journal . 810 (2 ): 117. Bibcode :2015ApJ...810..117G . doi :10.1088/0004-637X/810/2/117 S2CID 125700196 .
^ a b c Massarotti, Alessandro; et al. (January 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 d e Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R. (November 2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer" . The Astronomical Journal . 162 (5 ): 198. arXiv :2211.09030 Bibcode :2021AJ....162..198B . doi :10.3847/1538-3881/ac2431 ISSN 0004-6256 . S2CID 238998021 .
^ a b Kaler, James, "GIENAH CYGNI (Epsilon Cygni)" , Stars , University of Illinois , retrieved 2011-12-11
^ a b Rumrill, H. B. (1936). "Star Name Pronunciation" . Publications of the Astronomical Society of the Pacific . 48 Bibcode :1936PASP...48..139R . doi :10.1086/124681 S2CID 120743052 .
^ "LHS 5358b -- High proper-motion Star" , SIMBAD , Centre de Données astronomiques de Strasbourg , retrieved 2011-12-10
^ 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 ].
^ Allen, Richard Hinckley (1899), "Star-names and their meanings" , New York , G.E. Stechert: 197, Bibcode :1899sntm.book.....A
^ "IAU Working Group on Star Names (WGSN)" . Retrieved 22 May 2016 .
^ "WG Triennial Report (2015-2018) - Star Names" (PDF) . p. 5 . Retrieved 2018-07-14 .
^ "Naming Stars" . IAU.org. Retrieved 16 December 2017 .
^ (in Chinese) 中國星座神話 , written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7 .
^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2011-01-30 at the Wayback Machine , Hong Kong Space Museum. Accessed on line November 23, 2010.
^ a b McMillan, R. S.; Smith, P. H.; Moore, T. L.; Perry, M. L. (December 1992), "Variation of the radial velocity of Epsilon Cygni A", Publications of the Astronomical Society of the Pacific , 104 (682): 1173–1176, Bibcode :1992PASP..104.1173M , doi :10.1086/133105
^ "Washington Double Star Catalog" . United States Naval Observatory. Archived from the original on 14 February 2011. Retrieved 2 January 2018 .
^ Cohen, Martin; et al. (April 1999), "Spectral Irradiance Calibration in the Infrared. X. A Self-Consistent Radiometric All-Sky Network of Absolutely Calibrated Stellar Spectra", The Astronomical Journal , 117 (4 ): 1864–1889, Bibcode :1999AJ....117.1864C , doi :10.1086/300813
^ "The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16
^ Garrison, R. F. (December 1993), "Anchor Points for the MK System of Spectral Classification" , Bulletin of the American Astronomical Society , 25 Bibcode :1993AAS...183.1710G , archived from the original on 2019-06-25, retrieved 2012-02-04
External links
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Epsilon_Cygni&oldid=1230011399 " C a t e g o r i e s : ● B a y e r o b j e c t s ● C y g n u s ( c o n s t e l l a t i o n ) ● K - t y p e g i a n t s ● S t a r s w i t h p r o p e r n a m e s ● F l a m s t e e d 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 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 ● D u r c h m u s t e r u n g o b j e c t s ● G l i e s e a n d G J o b j e c t s ● M u l t i p l e s t a r 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 ) ● W e b a r c h i v e t e m p l a t e w a y b a c k l i n k s ● 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 m a t c h e s 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 A r a b i c - 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 C h i n e s e - 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 2 0 J u n e 2 0 2 4 , a t 0 1 : 3 9 ( 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
