| A | B |
|---|---|
X-ray light echoes from the 2015 nova eruption Credit: Andrew Beardmore (Univ. of Leicester) and NASA/Swift | … |
| Observation data Epoch J2000.0 Equinox ICRS | … |
| Constellation | Cygnus |
| Right ascension | 20 24 03.821 |
| Declination | +33° 52′ 02.0″1 |
| Apparent magnitude (V) | 11.2 - 18.82 |
| Characteristics | … |
| Spectral type | K3 III3 |
| U−B color index | +0.34 |
| B−V color index | +1.54 |
| Variable type | Nova5 |
| Astrometry | … |
| Proper motion (μ) | RA: −5.1771 mas/yr Dec.: −7.7781 mas/yr |
| Parallax (π) | 0.3024±0.0783 mas1 |
| Distance | 2,3906 pc |
| Absolute magnitude (M) | +3.47 |
| Details | … |
| A (black hole) | … |
| Mass | 96 M |
| B | … |
| Mass | 0.77 M |
| Radius | 6.07 R |
| Luminosity | 10.27 L |
| Surface gravity (log g) | 3.508 cgs |
| Temperature | 4,8008 K |
| Metallicity [Fe/H] | +0.238 dex |
| Rotational velocity (v sin i) | 36.48 km/s |
| C | … |
| Mass | 1.29 M |
| Radius | 1.859 R |
| Surface gravity (log g) | 3.959 cgs |
| Temperature | 6,1239 K |
| Metallicity [Fe/H] | −0.099 dex |
| Age | 4 Gyr |
| Other designations | … |
| V404 Cyg, Nova Cygni 1938, Nova Cygni 1989, GS 2023+338, AAVSO 2020+33 | … |
| Database references | … |
| SIMBAD | data |
V404 Cygni
(echo:: @ ᯤ)
Footnotes
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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 ↩3 ↩4 ↩5
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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. ↩
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Khargharia, Juthika; Froning, Cynthia S.; Robinson, Edward L. (2010). “Near-infrared Spectroscopy of Low-mass X-ray Binaries: Accretion Disk Contamination and Compact Object Mass Determination in V404 Cyg and Cen X-4”. The Astrophysical Journal. 716 (2): 1105. arXiv:1004.5358. Bibcode:2010ApJ…716.1105K. doi:10.1088/0004-637X/716/2/1105. S2CID 119116307. ↩
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Liu, Q. Z.; Van Paradijs, J.; Van Den Heuvel, E. P. J. (2007). “A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)”. Astronomy and Astrophysics. 469 (2): 807. arXiv:0707.0544. Bibcode:2007A&A…469..807L. doi:10.1051/0004-6361:20077303. S2CID 14673570. ↩ ↩2
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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. ↩
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Bernardini, F.; Russell, D. M.; Shaw, A. W.; Lewis, F.; Charles, P. A.; Koljonen, K. I. I.; Lasota, J. P.; Casares, J. (2016). “Events leading up to the 2015 June Outburst of V404 Cyg”. The Astrophysical Journal Letters. 818 (1): L5. arXiv:1601.04550. Bibcode:2016ApJ…818L…5B. doi:10.3847/2041-8205/818/1/L5. S2CID 119251825. ↩ ↩2
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Shahbaz, T.; Ringwald, F. A.; Bunn, J. C.; Naylor, T.; Charles, P. A.; Casares, J. (1994). “The mass of the black hole in V404 Cygni”. Monthly Notices of the Royal Astronomical Society. 271: L10–L14. Bibcode:1994MNRAS.271L..10S. doi:10.1093/mnras/271.1.L10. ↩ ↩2 ↩3 ↩4
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González Hernández, Jonay I.; Casares, Jorge; Rebolo, Rafael; Israelian, Garik; Filippenko, Alexei V.; Chornock, Ryan (2011). “Chemical Abundances of the Secondary Star in the Black Hole X-Ray Binary V404 Cygni”. The Astrophysical Journal. 738 (1): 95. arXiv:1106.4278. Bibcode:2011ApJ…738…95G. doi:10.1088/0004-637X/738/1/95. S2CID 118443418. ↩ ↩2 ↩3 ↩4
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Burdge, Kevin B.; El-Badry, Kareem; Kara, Erin; Canizares, Claude; Chakrabarty, Deepto; Frebel, Anna; Millholland, Sarah C.; Rappaport, Saul; Simcoe, Rob; Vanderburg, Andrew (2024). “The black hole low mass X-ray binary V404 Cygni is part of a wide hierarchical triple, and formed without a kick”. arXiv:2404.03719 [astro-ph.HE]. ↩ ↩2 ↩3 ↩4 ↩5