P Cygni

P Cygni
Location of P Cygni (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 17m 47.2020s[1]
Declination +38° 01′ 58.549″[1]
Apparent magnitude (V) 4.82[2] (3 to 6[3])
Characteristics
Spectral type B1-2 Ia-0ep[4] (B1 Iapeq[3])
U−B color index −0.58[5]
B−V color index +0.42[5]
Variable type LBV[3]
Astrometry
Radial velocity (Rv)−8.9[6] km/s
Proper motion (μ) RA: −3.723[1] mas/yr
Dec.: −6.798[1] mas/yr
Parallax (π)0.6251 ± 0.0729 mas[1]
Distance1,610±180[7] pc
Absolute magnitude (MV)−7.9[8]
Details
Mass37[9] M☉
Radius76[10] R☉
Luminosity610,000[10] L☉
Surface gravity (log g)2.25[9] cgs
Temperature18,700[10] K
Metallicity0.29[10] He/H
Rotational velocity (v sin i)35[11] km/s
Other designations
Nova Cyg 1600, 34 Cyg, JP11 3218, TD1 26474, GSC 03151-03442, TYC 3151-3442-1, AG+37° 1953, 2MASS J20174719+3801585, ALS 11097, HD 193237, MCW 849, BD+37°3871, Hen 3-1871, PLX 4837, CEL 5017, PPM 84645, P Cyg, RAFGL 5493S, GC 28218, HIP 100044, ROT 2959, GCRV 12673, HR 7763, SAO 69773, AAVSO 2014+37A
Database references
SIMBADdata

P Cygni (34 Cygni) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova. Located about 5,300 light-years (1,560 parsecs) from Earth, it is a hypergiant luminous blue variable (LBV) star of spectral type B1-2 Ia-0ep that is one of the most luminous stars in the Milky Way.

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ Ducati, J. R. (2002). "VizieR On-line 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 c Samus, N. N.; Durlevich, O. V.; et al. (2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR On-line Data Catalog: II/250. Originally Published in: 2004yCat.2250....0S. 2250: 0. Bibcode:2004yCat.2250....0S.
  4. ^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.
  5. ^ a b Smith, L. J.; Crowther, P. A.; Prinja, R. K. (1994). "A study of the luminous blue variable candidate He 3-519 and its surrounding nebula". Astronomy and Astrophysics. 281: 833. Bibcode:1994A&A...281..833S.
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ De Almeida, E S G.; Hugbart, M.; Domiciano De Souza, A.; Rivet, J-P; Vakili, F.; Siciak, A.; Labeyrie, G.; Garde, O.; Matthews, N.; Lai, O.; Vernet, D.; Kaiser, R.; Guerin, W. (2022). "Combined spectroscopy and intensity interferometry to determine the distances of the blue supergiants P Cygni and Rigel". Monthly Notices of the Royal Astronomical Society. 515 (1): 1–12. arXiv:2204.00372. Bibcode:2022MNRAS.515....1D. doi:10.1093/mnras/stac1617.
  8. ^ Van Genderen, A. M. (2001). "S Doradus variables in the Galaxy and the Magellanic Clouds". Astronomy and Astrophysics. 366 (2): 508–531. Bibcode:2001A&A...366..508V. doi:10.1051/0004-6361:20000022.
  9. ^ a b Rivet, J-P; Siciak, A.; de Almeida, E. S. G.; Vakili, F.; Domiciano de Souza, A.; Fouché, M.; Lai, O.; Vernet, D.; Kaiser, R.; Guerin, W. (2020). "Intensity interferometry of P Cygni in the H α emission line: Towards distance calibration of LBV supergiant stars". Monthly Notices of the Royal Astronomical Society. 494 (1): 218–227. arXiv:1910.08366. Bibcode:2020MNRAS.494..218R. doi:10.1093/mnras/staa588. S2CID 204788654.
  10. ^ a b c d Najarro, F. (2001). "Spectroscopy of P Cygni". P Cygni 2000: 400 Years of Progress. 233: 133. Bibcode:2001ASPC..233..133N.
  11. ^ Najarro, F.; Hillier, D. J.; Stahl, O. (1997). "A spectroscopic investigation of P Cygni. I. H and HeI lines". Astronomy and Astrophysics. 326: 1117. Bibcode:1997A&A...326.1117N.