RW Cephei

RW Cephei

Lokasi RW Cephei.
Data pengamatan
Epos J2000.0      Ekuinoks J2000.0
Rasi bintang Cepheus
Asensio rekta  22j 23m 07.01657d[1]
Deklinasi  +55° 57′ 47.6262″[1]
Magnitudo tampak (V) +6.65[2] (6.0 - 7.3[3])
Ciri-ciri
Kelas spektrum K2 0-Ia[4] (G8 - M2Ia-0[3])
Magnitudo semu (K) 1.88[2]
Indeks warna U−B 2.38[2]
Indeks warna B−V 2.22[2]
Jenis variabel SRd[5]
Astrometri
Kecepatan radial (Rv)-56.00[6] km/s
Gerak diri (μ) RA: -2.74[1] mdb/thn
Dek.: -2.66[1] mdb/thn
Paralaks (π)0,2357±0,0944[7] mdb
Jaraksekitar 14.000 tc
(sekitar 4.000 pc)
Magnitudo mutlak (MV)−8.0[8] - −9.4[9]
Detail
Massa13.9[10] M☉
Radius1,158[11] R☉
Luminositas417,000[12] L☉
Gravitasi permukaan (log g)0.2[13]
Suhu3,956 ± 129[11] (3,749 - 5,018)[13] K
Usia18.7[10] megatahun
Penamaan lain
HD 212466, HIP 110504, SAO 34387, BD+55°2737, AAVSO 2219+55A
Referensi basis data
SIMBADdata

RW Cephei adalah bintang superraksasa g8 yang dapat ditemukan di rasi bintang Cepheus dan juga bintang variabel, yang terletak sekitar 3.500 tahun cahaya dari Bumi dan berdiameter 1.535 jari-jari matahari. RW Cephei adalah salah satu bintang yang paling istimewa karena merupakan satu-satunya superraksasa oranye yang dikenal.[14][15][16][17]

Referensi

  1. ^ a b c d Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752 alt=Dapat diakses gratis. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ a b Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25. 25: 47. Bibcode:2006SASS...25...47W. 
  4. ^ Keenan, P. C.; Yorka, S. B. (1988). "1988 Revised MK Spectral Standards for Stars GO and Later". Bulletin d'Information du Centre de Données Stellaires. 35: 37. Bibcode:1988BICDS..35...37K. 
  5. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  6. ^ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878 alt=Dapat diakses gratis. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. 
  7. ^ Brown, A. G. A.; et al. (kolaborasi Gaia) (Agustus 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365 alt=Dapat diakses gratis. Bibcode:2018A&A...616A...1G alt=Dapat diakses gratis. doi:10.1051/0004-6361/201833051 alt=Dapat diakses gratis.  Catatan Gaia DR2 untuk sumber tersebut di VizieR.
  8. ^ Stencel, Robert E.; Pesce, Joseph E.; Hagen Bauer, Wendy (1988). "Far-infrared circumstellar 'debris' shell of red supergiant stars". Astronomical Journal. 95: 141. Bibcode:1988AJ.....95..141S. doi:10.1086/114622. 
  9. ^ Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series. 38: 309. Bibcode:1978ApJS...38..309H. doi:10.1086/190559. 
  10. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883 alt=Dapat diakses gratis. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. 
  11. ^ a b Stassun K.G.; et al. (October 2019). "The revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4). arXiv:1905.10694 alt=Dapat diakses gratis. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. 
  12. ^ Humphreys, R. M. (1984). "The brightest stars in the Magellanic Clouds and other late-type galaxies". IAU Symposium. 108: 145–156. Bibcode:1984IAUS..108..145H. doi:10.1017/S0074180900040134. 
  13. ^ a b Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama irtf
  14. ^ "RW Cephei (Supergiant Star) Star Facts". Universe Guide (dalam bahasa Inggris). Diakses tanggal 2020-07-19. 
  15. ^ "RW Cephei". Beyond Universe Wiki (dalam bahasa Inggris). Diarsipkan dari versi asli tanggal 2020-07-19. Diakses tanggal 2020-07-19. 
  16. ^ July 2018, Nola Taylor Redd 26. "What Is the Biggest Star?". Space.com (dalam bahasa Inggris). Diakses tanggal 2020-07-19. 
  17. ^ Cain, Fraser (2016-05-12). "What is the Biggest Star in the Universe?". Universe Today (dalam bahasa Inggris). Diakses tanggal 2020-07-19. 

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