KY Cygni

KY Cygni

Lokasi KY Cygni (dilingkari, timur berada di atas)
Data pengamatan
Epos J2000.0      Ekuinoks J2000.0 (ICRS)
Rasi bintang Cygnus
Asensio rekta  20j 25m 58.04d[1]
Deklinasi  +38° 21′ 07.7″[1]
Magnitudo tampak (V) 11.14[2] (10.60 - 11.74[3])
Ciri-ciri
Kelas spektrum M3 Ia[4] (M3.5 Ia[5] (M3.5 Ia[5])
Indeks warna U−B +2.91[2]
Indeks warna B−V +3.39[2]
Jenis variabel Lc[5]
Astrometri
Gerak diri (μ) RA: –3.556[1] mdb/thn
Dek.: –6.061[1] mdb/thn
Paralaks (π)0,6687±0,0517[1] mdb
Jarak4.900 ± 400 tc
(1.500 ± 100 pc)
Magnitudo mutlak (MV)–8.18[6]
Detail
Massa19[7] M☉
Radius1,033[7] R☉
Luminositas138,000[2] – 270,000[6][8] L☉
Gravitasi permukaan (log g)−0.5 (−0.9?)[6]
Suhu3,550[9] K
Penamaan lain
KY Cyg, GSC 03152-01140, IRAS 20241+3811, IRC+40415, TYC 3152-1140-1, RAFGL 2575, UCAC2 45230193, 2MASS J20255805+3821076
Referensi basis data
SIMBADdata

KY Cygni adalah bintang Superraksasa merah dari kelas spektrum M3.5la yang terletak di rasi bintang Cygnus.[10] KY Cygni merupakan salah satu bintang terbesar dan paling bercahaya yang pernah diketahui, dengan luminositas sekitar 300.000 kali lebih dari matahari dengan radius 1.000 kali ruas jari jari matahari. Jika ditempatkan di Tata Surya maka fotosfernya akan mencapai orbit Jupiter atau mungkin Saturnus.

Referensi

  1. ^ a b c d e Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Biermann, M.; Creevey, O. L.; Evans, D. W. (2021-05-01). "Gaia Early Data Release 3. Summary of the contents and survey properties". Astronomy and Astrophysics. 649: A1. doi:10.1051/0004-6361/202039657. ISSN 0004-6361.  Catatan Gaia DR3 untuk sumber ini di VizieR.
  2. ^ a b c d Mauron, N.; Josselin, E. (2011). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy and Astrophysics. 526: A156. arXiv:1010.5369 alt=Dapat diakses gratis. Bibcode:2011A&A...526A.156M. doi:10.1051/0004-6361/201013993. 
  3. ^ Alfonso-Garzón, J.; Domingo, A.; Mas-Hesse, J. M.; Giménez, A. (2012). "The first INTEGRAL-OMC catalogue of optically variable sources". Astronomy & Astrophysics. 548: A79. arXiv:1210.0821 alt=Dapat diakses gratis. Bibcode:2012A&A...548A..79A. doi:10.1051/0004-6361/201220095. 
  4. ^ White, N. M.; Wing, R. F. (1978). "Photoelectric two-dimensional spectral classification of M supergiants". Astrophysical Journal. 222: 209. Bibcode:1978ApJ...222..209W. doi:10.1086/156136. 
  5. ^ a b c KY Cyg, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Diarsipkan 2017-06-20 di Wayback Machine., Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.
  6. ^ a b c Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv:astro-ph/0504337 alt=Dapat diakses gratis. Bibcode:2005ApJ...628..973L. doi:10.1086/430901. 
  7. ^ a b Comerón, F.; Djupvik, A. A.; Schneider, N.; Pasquali, A. (October 2020). "The historical record of massive star formation in Cygnus". Astronomy & Astrophysics. 644: A62. arXiv:2009.12779 alt=Dapat diakses gratis. Bibcode:2020A&A...644A..62C. doi:10.1051/0004-6361/202039188. 
  8. ^ Dorn-Wallenstein, Trevor Z.; Levesque, Emily M.; Neugent, Kathryn F.; Davenport, James R. A.; Morris, Brett M.; Gootkin, Keyan (2020). "Short Term Variability of Evolved Massive Stars with TESS II: A New Class of Cool, Pulsating Supergiants". The Astrophysical Journal. 902 (1): 24. arXiv:2008.11723 alt=Dapat diakses gratis. Bibcode:2020ApJ...902...24D. doi:10.3847/1538-4357/abb318. 
  9. ^ Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744 alt=Dapat diakses gratis. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. 
  10. ^ "KY Cygni (Supergiant Star) Star Facts". Universe Guide (dalam bahasa Inggris). Diakses tanggal 2020-02-15. 

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