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Epsilon Cygni ? Wikipedia ti?ng Vi?t B??c t?i n?i dung

Epsilon Cygni

Bach khoa toan th? m? Wikipedia
Epsilon Cygni
V? tri c?a ε Cyg (khoanh tron)
D? li?u quan sat
K? nguyen J2000       Xuan phan J2000
Chom sao Thien Nga
Xich kinh 20 h  46 m  12.68236 s [1]
Xich v? +33° 58′ 12.9250″ [1]
C?p sao bi?u ki?n   (V) 2.480 [2]
Cac đ?c tr?ng
Ki?u quang ph? K0III-IV [3]
Ch? m?c mau U-B +0.860 [2]
Ch? m?c mau B-V +1.030 [2]
Tr?c l??ng h?c thien th?
V?n t?c xuyen tam (R v ) ?12.41 [4]   km/s
Chuy?n đ?ng rieng (μ) RA :  355.66 [1]   mas / n?m
Dec. :  330.60 [1]   mas / n?m
Th? sai (π) 44.86 ± 0.12 [1]   mas
Kho?ng cach 72.7 ± 0.2  ly
(22.29 ± 0.06  pc )
C?p sao tuy?t đ?i   (M V ) +0.78 ± 0.03 [5]
Cac đ?c đi?m qu? đ?o [6]
Sao chinh ε Cyg Aa
Sao ph? ε Cyg Ab
Chu k? (P) 2030 d
đ? l?ch tam (e) 0.7
K? nguyen đi?m c?n tinh (T) JD 2446800.5
Acgumen c?n tinh (ω)
(s? c?p) 		260°
Ban bien đ? (K 1 )
(s? c?p) 		180 km / s
Chi ti?t
Kh?i l??ng ~2 [7]   M ?
Ban kinh 10.82 ± 0.14 [8]   R ?
đ? sang 62 ± 3 [8]   L ?
H?p d?n b? m?t (log  g ) 2.8 [4]   cgs
Nhi?t đ? 4,710 [4]   K
đ? kim lo?i [Fe/H] ?0.27 [4]   dex
T?c đ? t? quay ( v  sin  i ) 3.0 ± 1.0 [5]   km / s
Tu?i ~1.5 [7]   Gyr
Ten g?i khac
Aljanah, Gienah [9] , ε Cyg, 53 Cygni, BD  +33°4018, FK5  780, GCTP  4959.00, Gl  806.1, HD  197989, HIP  102488, HR  7949, LHS  5358, SAO  70474, WDS 20462+3358. [10]
C? s? d? li?u tham chi?u
SIMBAD d? li?u

Epsilon Cygni ( ε Cygni vi?t t?t la Epsilon Cyg, ε Cyg ) la ten c?a m?t h? đa sao n?m trong chom sao Thien Nga . Kho?ng cach c?a no v?i m?t tr?i la 73 n?m anh sang . V?i c?p sao bi?u ki?n la 2,48, ngoi sao nay co th? đ??c nhin th?y b?ng m?t th??ng.

Thien th? đ?ng hanh [ s?a | s?a ma ngu?n ]

Ngoi sao nay co m?t thien th? đ?ng hanh quang h?c la Epsillon Cygni B, gi?a chung thi khong co lien k?t v?t li va them m?t thien th? đ?ng hanh khac Epsillon Cygni C n?m ? m?t phan tach goc 78 giay cung. [11]

đ?c đi?m [ s?a | s?a ma ngu?n ]

Ngoi sao nay co m?t quang ph? đoi [12] . Cac quan sat v?n t?c xuyen tam c?a ngoi sao nay đa cho th?y thien th? đ?ng hanh c?a no co chu ki qu? đ?o it nh?t la 15 n?m [11] . Cac quan sat cho th?y no la m?t ngoi sao kh?ng l? lo?i K0 III [13] . đi?u nay cho th?y r?ng ngoi sao nay đa r?i kh?i day chinh va b?t đ?u giai đo?n cu?i cung trong qua trinh ti?n hoa c?a sao. Nhi?t đ? hi?u d?ng c?a quang c?u c?a no la 4710 Kelvin, t?o ra mau cam. đo la net đ?c tr?ng c?a cac ngoi sao lo?i K [14] . Ban kinh c?a no g?n g?p 11 l?n ban kinh m?t tr?i va đ? sang c?a no g?p 62 l?n c?a m?t tr?i. [8]

K? t? n?m c?a n?m 1943, quang ph? c?a ngoi sao nay đa đ??c dung lam m?c đ? phan lo?i cac ngoi sao khac. [15]

D? li?u hi?n t?i [ s?a | s?a ma ngu?n ]

Theo nh? quan sat, đay la ngoi sao n?m trong chom sao Thien Nga va d??i đay la m?t s? d? li?u khac:

Xich kinh 20 h  46 m  12.68236 s [1]

đ? nghieng +33° 58′ 12.9250″ [1]

C?p sao bi?u ki?n 2.480 [2]

Lo?i quang ph? K0III-IV [3]

C?p sao tuy?t đ?i +0.78 ± 0.03 [5]

Th? sai 44.86 ± 0.12 [1]

đ? kim lo?i ?0.27 [4]

V?n t?c xuyen tam ?12.41 km/s [4]

Tham kh?o [ s?a | s?a ma ngu?n ]

  1. ^ a b c d e f g h van Leeuwen, Floor (thang 11 n?m 2007), “Validation of the new Hipparcos reduction”, Astronomy and Astrophysics , 474 (2): 653?664, arXiv : 0708.1752v1 , Bibcode : 2007A&A...474..653V , doi : 10.1051/0004-6361:20078357 Note: see VizieR catalogue I/311 .
  2. ^ a b c d Oja, T. (thang 8 n?m 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
  3. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). “Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I” . The Astronomical Journal . 126 (4): 2048. arXiv : astro-ph/0308182 . Bibcode : 2003AJ....126.2048G . doi : 10.1086/378365 .
  4. ^ a b c d e f Massarotti, Alessandro; va đ?ng nghi?p (thang 1 n?m 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
  5. ^ a b c Carney, Bruce W.; va đ?ng nghi?p (thang 3 n?m 2008), “Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars”, The Astronomical Journal , 135 (3): 892?906, arXiv : 0711.4984 , Bibcode : 2008AJ....135..892C , doi : 10.1088/0004-6256/135/3/892
  6. ^ Griffin, R. F (1994). “Photoelectric radial velocities, Paper XIV. Variation of the radial velocity of ε Cygni”. Monthly Notices of the Royal Astronomical Society . 267 : 69. Bibcode : 1994MNRAS.267...69G . doi : 10.1093/mnras/267.1.69 .
  7. ^ a b Kaler, James, “GIENAH CYGNI (Epsilon Cygni)” , Stars , University of Illinois , truy c?p ngay 11 thang 12 n?m 2011
  8. ^ a b c Piau, L.; va đ?ng nghi?p (thang 2 n?m 2011), “Surface convection and red-giant radius measurements”, Astronomy and Astrophysics , 526 : A100, arXiv : 1010.3649 , Bibcode : 2011A&A...526A.100P , doi : 10.1051/0004-6361/201014442
  9. ^ Rumrill, H. B. (1936). “Star Name Pronunciation”. Publications of the Astronomical Society of the Pacific . 48 : 139. Bibcode : 1936PASP...48..139R . doi : 10.1086/124681 .
  10. ^ “LHS 5358b -- High proper-motion Star” , SIMBAD , Centre de Donnees astronomiques de Strasbourg , truy c?p ngay 10 thang 12 n?m 2011
  11. ^ a b McMillan, R. S.; Smith, P. H.; Moore, T. L.; Perry, M. L. (thang 12 n?m 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
  12. ^ “Washington Double Star Catalog” . United States Naval Observatory. B?n g?c l?u tr? ngay 14 thang 2 n?m 2011 . Truy c?p ngay 2 thang 1 n?m 2018 .
  13. ^ Cohen, Martin; va đ?ng nghi?p (thang 4 n?m 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
  14. ^ “The Colour of Stars” , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation , ngay 21 thang 12 n?m 2004, B?n g?c l?u tr? ngay 3 thang 12 n?m 2013 , truy c?p ngay 16 thang 1 n?m 2012 đa đ?nh ro h?n m?t tham s? trong |archiveurl= va |archive-url= ( tr? giup )
  15. ^ Garrison, R. F. (thang 12 n?m 1993), “Anchor Points for the MK System of Spectral Classification” , Bulletin of the American Astronomical Society , 25 : 1319, Bibcode : 1993AAS...183.1710G , B?n g?c l?u tr? ngay 25 thang 6 n?m 2019 , truy c?p ngay 4 thang 2 n?m 2012

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