KY Cygni
bintang yang terletak di rasi bintang Cygnus
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.
  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 |
| Jarak | 4.900 ± 400 tc (1.500 ± 100 pc) |
| Magnitudo mutlak (MV) | –8.18[6] |
| Detail | |
| Massa | 19[7] M☉ |
| Radius | 1,033[7] R☉ |
| Luminositas | 138,000[2] – 270,000[6][8] L☉ |
| Gravitasi permukaan (log g) | −0.5 (−0.9?)[6] |
| Suhu | 3,550[9] K |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
Referensi
sunting- ^ 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.
- ^ 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
. Bibcode:2011A&A...526A.156M. doi:10.1051/0004-6361/201013993.
- ^ 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 . Bibcode:2012A&A...548A..79A. doi:10.1051/0004-6361/201220095.
- ^ 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.
- ^ 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.
- ^ 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 . Bibcode:2005ApJ...628..973L. doi:10.1086/430901.
- ^ 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 . Bibcode:2020A&A...644A..62C. doi:10.1051/0004-6361/202039188.
- ^ 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 . Bibcode:2020ApJ...902...24D. doi:10.3847/1538-4357/abb318.
- ^ 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 . Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
- ^ "KY Cygni (Supergiant Star) Star Facts". Universe Guide (dalam bahasa Inggris). Diakses tanggal 2020-02-15.
