Cygnus X-1 (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cygnus X-1" in Italian language version.

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W. Lewin, M. Van Der Klis, Compact Stellar X-ray Sources, in Cambridge University Press, 2006, p. 159, ISBN 0-521-82659-4.
B. Abrams, M. Stecker, Structures in Space: Hidden Secrets of the Deep Sky, Springer, 1999, p. 91, ISBN 1-85233-165-8.
J.-P. Luminet, Black Holes, Cambridge University Press, 1992, ISBN 0-521-40906-3.
K. Thorne, Black Holes and Time Warps: Einstein's Outrageous Legacy, W. W. Norton & Company, 1994, ISBN 0-393-31276-3.

arxiv.org

F. van Leeuwen, Validation of the new Hipparcos reduction, in Astronomy and Astrophysics, vol. 474, n. 2, novembre 2007, pp. 653-664, DOI:10.1051/0004-6361:20078357, arXiv:0708.1752.
J. Ziółkowski, Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system, in Monthly Notices of the Royal Astronomical Society, vol. 358, n. 3, 2005, pp. 851-859, DOI:10.1111/j.1365-2966.2005.08796.x, arXiv:astro-ph/0501102. URL consultato il 4 marzo 2008. Nota: per il raggio e la luminosità, si veda la Tabella 1 con d=2 kpc.
P. Hadrava, Optical spectroscopy of Cyg X-1, Proceedings of RAGtime 9: Workshops on black holes and neutron stars, Opava, Repubblica Ceca, 15-21 settembre 2007, arXiv:0710.0758.
I. F. Mirabel, I. Rodrigues, Formation of a Black Hole in the Dark, in Science, vol. 300, n. 5622, 2003, pp. 1119-1120, Bibcode:2003Sci...300.1119M, DOI:10.1126/science.1083451, PMID 12714674, arXiv:astro-ph/0305205. URL consultato il 15 marzo 2008.
M. J. Reid et al, The Trigonometric Parallax of Cygnus X-1, in The Astrophysical Journal, vol. 742, n. 2, dicembre 2011, DOI:10.1088/0004-637X/742/2/83, arXiv:1106.3688.
C. Brocksopp et al., An Improved Orbital Ephemeris for Cygnus X-1, in Astronomy & Astrophysics, vol. 343, 1999, pp. 861-864, arXiv:astro-ph/9812077.
A. J. Young et al., A Complete Relativistic Ionized Accretion Disc in Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 325, n. 3, 2001, pp. 1045-1052, DOI:10.1046/j.1365-8711.2001.04498.x, arXiv:astro-ph/0103214.
E. Gallo, R. Fender, Accretion modes and jet production in black hole X-ray binaries, in Memorie della Società Astronomica Italiana, vol. 76, 2005, pp. 600-607, arXiv:astro-ph/0509172.
C. Z. Liu, T. P. Li, X-Ray Spectral Variability in Cygnus X-1, in The Astrophysical Journal, vol. 611, n. 2, 1999, pp. 1084-1090, DOI:10.1086/422209, arXiv:astro-ph/0405246.
I. Bombaci, The maximum mass of a neutron star, in Astronomy and Astrophysics, vol. 305, 1996, pp. 871-877, arXiv:astro-ph/9608059.
E. Koerding, S. Jester, R. Fender, Accretion states and radio loudness in Active Galactic Nuclei: analogies with X-ray binaries, in Monthly Notices of the Royal Astronomical Society, vol. 372, n. 3, 2006, pp. 1366-1378, DOI:10.1111/j.1365-2966.2006.10954.x, arXiv:astro-ph/0608628.
J. M. Miller et al., Revealing the Focused Companion Wind in Cygnus X-1 with Chandra, in The Astrophysical Journal, vol. 620, n. 1, 2005, pp. 398-404, DOI:10.1086/426701, arXiv:astro-ph/0208463.
J. M. Miller, Relativistic Iron Lines in Galactic Black Holes: Recent Results and Lines in the ASCA Archive, Proceedings of the 10th Annual Marcel Grossmann Meeting on General Relativity, Rio de Janeiro, Brasile, 20-26 luglio 2003, DOI:10.1142/9789812704030_0093, arXiv:astro-ph/0402101.
L. Gou et al., The Extreme Spin of the Black Hole in Cygnus X-1, in The Astrophysical Journal, vol. 742, n. 85, 9 novembre 2011, DOI:10.1088/0004-637X/742/2/85, arXiv:1106.3690.
P. Podsiadlowski, S. Rappaport, Z. Han, On the formation and evolution of black-hole binaries, in Monthly Notices of the Royal Astronomical Society, vol. 341, n. 2, 2002, pp. 385-404, DOI:10.1046/j.1365-8711.2003.06464.x, arXiv:astro-ph/0207153.
L. Titarchuk, N. Shaposhnikov, On the nature of the variability power decay towards soft spectral states in X-ray binaries. Case study in Cyg X-1, in The Astrophysical Journal, vol. 678, n. 2, 9 febbraio 2008, pp. 1230-1236, DOI:10.1086/587124, arXiv:0802.1278.
D. F. Torres et al., Probing the Precession of the Inner Accretion Disk in Cygnus X-1, in The Astrophysics Journal, vol. 626, n. 2, 2005, pp. 1015-1019, DOI:10.1086/430125, arXiv:astro-ph/0503186.
D. M. Russell et al., The jet-powered optical nebula of Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 376, n. 3, 2007, pp. 1341-1349, DOI:10.1111/j.1365-2966.2007.11539.x, arXiv:astro-ph/0701645.
E. Gallo et al., A dark jet dominates the power output of the stellar black hole Cygnus X-1, in Nature, vol. 436, n. 7052, 2005, pp. 819-821, DOI:10.1038/nature03879, PMID 16094361, arXiv:astro-ph/0508228.
J. Albert et al., Very High Energy Gamma-ray Radiation from the Stellar-mass Black Hole Cygnus X-1, in Astrophysical Journal Letters, vol. 665, n. 1, 2007, pp. L51–L54, DOI:10.1086/521145, arXiv:0706.1505.
L. Iorio, On the orbital and physical parameters of the HDE 226868/Cygnus X-1 binary system, in Astrophysics and Space Science, vol. 315, n. 1-4, 24 luglio 2007, p. 335, DOI:10.1007/s10509-008-9839-y, arXiv:0707.3525.
G. G. Pooley, R. P. Fender, C. Brocksopp, Orbital modulation and longer-term variability in the radio emission from Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 302, n. 1, 1999, pp. L1–L5, DOI:10.1046/j.1365-8711.1999.02225.x, arXiv:astro-ph/9809305.
D. R. Gies et al., Wind Accretion and State Transitions in Cygnus X-1, in The Astrophysical Journal, vol. 583, n. 1, 2003, pp. 424-436, DOI:10.1086/345345, arXiv:astro-ph/0206253.

astrophysicsspectator.com

J. Brainerd, X-rays from AGNs, su astrophysicsspectator.com, The Astrophysics Spectator, 10 luglio 2005. URL consultato il 24 marzo 2008.

doi.org

dx.doi.org

F. van Leeuwen, Validation of the new Hipparcos reduction, in Astronomy and Astrophysics, vol. 474, n. 2, novembre 2007, pp. 653-664, DOI:10.1051/0004-6361:20078357, arXiv:0708.1752.
J. Ziółkowski, Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system, in Monthly Notices of the Royal Astronomical Society, vol. 358, n. 3, 2005, pp. 851-859, DOI:10.1111/j.1365-2966.2005.08796.x, arXiv:astro-ph/0501102. URL consultato il 4 marzo 2008. Nota: per il raggio e la luminosità, si veda la Tabella 1 con d=2 kpc.
I. F. Mirabel, I. Rodrigues, Formation of a Black Hole in the Dark, in Science, vol. 300, n. 5622, 2003, pp. 1119-1120, Bibcode:2003Sci...300.1119M, DOI:10.1126/science.1083451, PMID 12714674, arXiv:astro-ph/0305205. URL consultato il 15 marzo 2008.
Z. Ninkov, G. A. H. Walker, S. Yang, The primary orbit and the absorption lines of HDE 226868 (Cygnus X-1), in Astrophysical Journal, vol. 321, 1987, pp. 425-437, DOI:10.1086/165641.
M. J. Reid et al, The Trigonometric Parallax of Cygnus X-1, in The Astrophysical Journal, vol. 742, n. 2, dicembre 2011, DOI:10.1088/0004-637X/742/2/83, arXiv:1106.3688.
S. Bowyer et al., Cosmic X-ray Sources, in Science, vol. 147, n. 3656, 1965, pp. 394-398, DOI:10.1126/science.147.3656.394, PMID 17832788.
D. R. Gies, C. T. Bolton, The optical spectrum of HDE 226868 = Cygnus X-1. II — Spectrophotometry and mass estimates, in The Astrophysical Journal, Part 1, vol. 304, 1986, pp. 371-393, DOI:10.1086/164171.
A. J. Young et al., A Complete Relativistic Ionized Accretion Disc in Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 325, n. 3, 2001, pp. 1045-1052, DOI:10.1046/j.1365-8711.2001.04498.x, arXiv:astro-ph/0103214.
C. Z. Liu, T. P. Li, X-Ray Spectral Variability in Cygnus X-1, in The Astrophysical Journal, vol. 611, n. 2, 1999, pp. 1084-1090, DOI:10.1086/422209, arXiv:astro-ph/0405246.
M. Oda et al., X-Ray Pulsations from Cygnus X-1 Observed from UHURU, in The Astrophysical Journal, vol. 166, 1999, pp. L1–L7, DOI:10.1086/180726.
J. Kristian et al., On the Optical Identification of Cygnus X-1, in The Astrophysical Journal, vol. 168, 1971, pp. L91–L93, DOI:10.1086/180790.
L. L. E. Braes, G. K. Miley, Physical Sciences: Detection of Radio Emission from Cygnus X-1, in Nature, vol. 232, n. 5308, 23 luglio 1971, p. 246, DOI:10.1038/232246a0, PMID 16062947.
B. L. Webster, P. Murdin, Cygnus X-1—a Spectroscopic Binary with a Heavy Companion?, in Nature, vol. 235, n. 2, 1972, pp. 37-38, DOI:10.1038/235037a0.
C. T. Bolton, Identification of Cygnus X-1 with HDE 226868, in Nature, vol. 235, n. 2, 1972, pp. 271-273, DOI:10.1038/235271b0.
H. L. Shipman, The implausible history of triple star models for Cygnus X-1 Evidence for a black hole, in Astrophysical Letters, vol. 16, n. 1, 1975, pp. 9-12, DOI:10.1016/S0304-8853(99)00384-4.
R. E. Rothschild et al., Millisecond Temporal Structure in Cygnus X-1, in The Astrophysical Journal, vol. 189, 1974, pp. 77-115, DOI:10.1086/181452.
E. Koerding, S. Jester, R. Fender, Accretion states and radio loudness in Active Galactic Nuclei: analogies with X-ray binaries, in Monthly Notices of the Royal Astronomical Society, vol. 372, n. 3, 2006, pp. 1366-1378, DOI:10.1111/j.1365-2966.2006.10954.x, arXiv:astro-ph/0608628.
S. F. Odenwald, P. R. Schwartz, An IRAS survey of star-forming regions toward Cygnus, in Astrophysical Journal, vol. 405, n. 2, marzo 1993, pp. 706-719, DOI:10.1086/172398. URL consultato il 28 luglio 2013.
N. Schneider et al., A new view of the Cygnus X region. KOSMA ¹³CO 2 to 1, 3 to 2, and ¹²CO 3 to 2 imaging, in Astronomy and Astrophysics, vol. 458, n. 3, novembre 2006, pp. 855-871, DOI:10.1051/0004-6361:20065088. URL consultato il 28 luglio 2013.
H. Gursky et al., The Estimated Distance to Cygnus X-1 Based on its Low-Energy X-Ray Spectrum, in Astrophysical Journal, vol. 167, 1971, pp. L15, DOI:10.1086/180751.
N. Billot et al., Young Stellar Objects and Triggered Star Formation in the Vulpecula OB Association, in The Astrophysical Journal, vol. 712, n. 2, aprile 2010, pp. 797-812, DOI:10.1088/0004-637X/712/2/797. URL consultato il 28 luglio 2013.
Y. Xu et al., Trigonometric Parallaxes of Massive Star-Forming Regions: III. G59.7+0.1 and W 51 IRS2, in The Astrophysical Journal, vol. 693, n. 1, marzo 2009, pp. 413-418, DOI:10.1088/0004-637X/693/1/413. URL consultato il 28 luglio 2013.
P. G. Johnson, P. Mack, R. Songsathaporn, A radial velocity survey of the H II region S101, in Astrophysics and Space Science, vol. 87, n. 1-2, ottobre 1982, pp. 13-20, DOI:10.1007/BF00648903. URL consultato il 28 luglio 2013.
A. Talamantes et al., Bright Variable Stars in NGC 6819: An Open Cluster in The Kepler Field, in The Astronomical Journal, vol. 140, n. 5, novembre 2010, pp. 1268-1281, DOI:10.1088/0004-6256/140/5/1268. URL consultato il 28 giugno 2013.
J. M. Miller et al., Revealing the Focused Companion Wind in Cygnus X-1 with Chandra, in The Astrophysical Journal, vol. 620, n. 1, 2005, pp. 398-404, DOI:10.1086/426701, arXiv:astro-ph/0208463.
C. T. Bolton, Optical observations and model for Cygnus X-1, in The Astrophysical Journal, vol. 200, 1975, pp. 269-277, DOI:10.1086/153785.
O. E. Rössler, Almost-Black-Holes: an old—new paradigm, in Chaos, Solitons & Fractals, vol. 9, n. 7, 1998, pp. 1025-1034, DOI:10.1016/S0960-0779(98)80004-0.
J. F. Dolan, Dying Pulse Trains in Cygnus XR-1: Evidence for an Event Horizon?, in The Publications of the Astronomical Society of the Pacific, vol. 113, n. 786, 2001, pp. 974-982, DOI:10.1086/322917.
J. M. Miller, Relativistic Iron Lines in Galactic Black Holes: Recent Results and Lines in the ASCA Archive, Proceedings of the 10th Annual Marcel Grossmann Meeting on General Relativity, Rio de Janeiro, Brasile, 20-26 luglio 2003, DOI:10.1142/9789812704030_0093, arXiv:astro-ph/0402101.
L. Gou et al., The Extreme Spin of the Black Hole in Cygnus X-1, in The Astrophysical Journal, vol. 742, n. 85, 9 novembre 2011, DOI:10.1088/0004-637X/742/2/85, arXiv:1106.3690.
P. Podsiadlowski, S. Rappaport, Z. Han, On the formation and evolution of black-hole binaries, in Monthly Notices of the Royal Astronomical Society, vol. 341, n. 2, 2002, pp. 385-404, DOI:10.1046/j.1365-8711.2003.06464.x, arXiv:astro-ph/0207153.
J. C. Ling, Gamma-Ray Spectra and Variability of Cygnus X-1 Observed by BATSE, in The Astrophysical Journal, vol. 484, n. 1, 1997, pp. 375-382, DOI:10.1086/304323.
N. Kylafis, D. Giannios D. Psaltis, Spectra and time variability of black-hole binaries in the low/hard state, in Advances in Space Research, vol. 38, n. 12, 2006, pp. 2810-2812, DOI:10.1016/j.asr.2005.09.045.
L. Titarchuk, N. Shaposhnikov, On the nature of the variability power decay towards soft spectral states in X-ray binaries. Case study in Cyg X-1, in The Astrophysical Journal, vol. 678, n. 2, 9 febbraio 2008, pp. 1230-1236, DOI:10.1086/587124, arXiv:0802.1278.
A. C. Fabian, J. M. Miller, Black Holes Reveal Their Innermost Secrets, in Science, vol. 297, n. 5583, 9 agosto 2002, pp. 947-948, DOI:10.1126/science.1074957, PMID 12169716.
L. Stella et al., The discovery of 4.4 second X-ray pulsations from the rapidly variable X-ray transient V0332 + 53, in Astrophysical Journal, Part 2 - Letters to the Editor, vol. 288, 1985, pp. L45–L49, DOI:10.1086/184419.
R. Narayan, Evidence for the black hole event horizon, in Astronomy & Geophysics, vol. 44, n. 6, 2003, pp. 77-115, DOI:10.1046/j.1468-4004.2003.44622.x.
D. F. Torres et al., Probing the Precession of the Inner Accretion Disk in Cygnus X-1, in The Astrophysics Journal, vol. 626, n. 2, 2005, pp. 1015-1019, DOI:10.1086/430125, arXiv:astro-ph/0503186.
S. Kitamoto et al., GINGA All-Sky Monitor Observations of Cygnus X-1, in The Astrophysical Journal, vol. 531, n. 1, 2000, pp. 546-552, DOI:10.1086/308423.
M. C. Begelman, Evidence for Black Holes, in Science, vol. 300, n. 5627, 2003, pp. 1898-1903, DOI:10.1126/science.1085334, PMID 12817138.
D. M. Russell et al., The jet-powered optical nebula of Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 376, n. 3, 2007, pp. 1341-1349, DOI:10.1111/j.1365-2966.2007.11539.x, arXiv:astro-ph/0701645.
I.-J. Sackmann, A. I. Boothroyd, K. E. Kraemer, Our Sun. III. Present and Future, in The Astrophysical Journal, vol. 418, 1993, pp. 457-468, DOI:10.1086/173407.
E. Gallo et al., A dark jet dominates the power output of the stellar black hole Cygnus X-1, in Nature, vol. 436, n. 7052, 2005, pp. 819-821, DOI:10.1038/nature03879, PMID 16094361, arXiv:astro-ph/0508228.
J. Albert et al., Very High Energy Gamma-ray Radiation from the Stellar-mass Black Hole Cygnus X-1, in Astrophysical Journal Letters, vol. 665, n. 1, 2007, pp. L51–L54, DOI:10.1086/521145, arXiv:0706.1505.
L. Iorio, On the orbital and physical parameters of the HDE 226868/Cygnus X-1 binary system, in Astrophysics and Space Science, vol. 315, n. 1-4, 24 luglio 2007, p. 335, DOI:10.1007/s10509-008-9839-y, arXiv:0707.3525.
J. W. Sowers et al., Tomographic Analysis of Hα Profiles in HDE 226868/Cygnus X-1, in The Astrophysical Journal, vol. 506, n. 1, 1998, pp. 424-430, DOI:10.1086/306246.
J. B. Hutchings, Stellar winds from hot supergiants, in The Astrophysical Journal, vol. 203, 1976, pp. 438-447, DOI:10.1086/154095.
G. G. Pooley, R. P. Fender, C. Brocksopp, Orbital modulation and longer-term variability in the radio emission from Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 302, n. 1, 1999, pp. L1–L5, DOI:10.1046/j.1365-8711.1999.02225.x, arXiv:astro-ph/9809305.
D. R. Gies et al., Wind Accretion and State Transitions in Cygnus X-1, in The Astrophysical Journal, vol. 583, n. 1, 2003, pp. 424-436, DOI:10.1086/345345, arXiv:astro-ph/0206253.
B. Margon, S. Bowyer, R. P. S. Stone, On the Distance to Cygnus X-1, in The Astrophysical Journal, vol. 185, n. 2, 1973, pp. L113–L116, DOI:10.1086/181333.

esa.int

Observations: Seeing in X-ray wavelengths, su esa.int, ESA, 5 novembre 2004. URL consultato il 12 agosto 2008.
T. Strohmayer, New technique for ‘weighing’ black holes, su esa.int, ESA, 16 maggio 2007. URL consultato il 10 marzo 2008.

hubble.esa.int

Integral's view of Cygnus X-1, su hubble.esa.int, ESA, 10 giugno 2003. URL consultato il 20 marzo 2008.

harvard.edu

adsabs.harvard.edu

F. van Leeuwen, Validation of the new Hipparcos reduction, in Astronomy and Astrophysics, vol. 474, n. 2, novembre 2007, pp. 653-664, DOI:10.1051/0004-6361:20078357, arXiv:0708.1752.
J. Ziółkowski, Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system, in Monthly Notices of the Royal Astronomical Society, vol. 358, n. 3, 2005, pp. 851-859, DOI:10.1111/j.1365-2966.2005.08796.x, arXiv:astro-ph/0501102. URL consultato il 4 marzo 2008. Nota: per il raggio e la luminosità, si veda la Tabella 1 con d=2 kpc.
J. Bregman et al., Colors, magnitudes, spectral types and distances for stars in the field of the X-ray source Cyg X-1, in Lick Observatory Bulletin, vol. 647, 1973, p. 1.
I. F. Mirabel, I. Rodrigues, Formation of a Black Hole in the Dark, in Science, vol. 300, n. 5622, 2003, pp. 1119-1120, Bibcode:2003Sci...300.1119M, DOI:10.1126/science.1083451, PMID 12714674, arXiv:astro-ph/0305205. URL consultato il 15 marzo 2008.
Z. Ninkov, G. A. H. Walker, S. Yang, The primary orbit and the absorption lines of HDE 226868 (Cygnus X-1), in Astrophysical Journal, vol. 321, 1987, pp. 425-437, DOI:10.1086/165641.
M. J. Reid et al, The Trigonometric Parallax of Cygnus X-1, in The Astrophysical Journal, vol. 742, n. 2, dicembre 2011, DOI:10.1088/0004-637X/742/2/83, arXiv:1106.3688.
S. Bowyer et al., Cosmic X-ray Sources, in Science, vol. 147, n. 3656, 1965, pp. 394-398, DOI:10.1126/science.147.3656.394, PMID 17832788.
C. Brocksopp et al., An Improved Orbital Ephemeris for Cygnus X-1, in Astronomy & Astrophysics, vol. 343, 1999, pp. 861-864, arXiv:astro-ph/9812077.
D. R. Gies, C. T. Bolton, The optical spectrum of HDE 226868 = Cygnus X-1. II — Spectrophotometry and mass estimates, in The Astrophysical Journal, Part 1, vol. 304, 1986, pp. 371-393, DOI:10.1086/164171.
S. Nayakshin, J. B. Dove, X-rays From Magnetic Flares In Cygnus X-1: The Role Of A Transition Layer, in eprint arXiv:astro-ph/9811059, 3 novembre 1998.
A. J. Young et al., A Complete Relativistic Ionized Accretion Disc in Cygnus X-1, in Monthly Notices of the Royal Astronomical Society, vol. 325, n. 3, 2001, pp. 1045-1052, DOI:10.1046/j.1365-8711.2001.04498.x, arXiv:astro-ph/0103214.
E. Gallo, R. Fender, Accretion modes and jet production in black hole X-ray binaries, in Memorie della Società Astronomica Italiana, vol. 76, 2005, pp. 600-607, arXiv:astro-ph/0509172.
C. Z. Liu, T. P. Li, X-Ray Spectral Variability in Cygnus X-1, in The Astrophysical Journal, vol. 611, n. 2, 1999, pp. 1084-1090, DOI:10.1086/422209, arXiv:astro-ph/0405246.
M. Oda et al., X-Ray Pulsations from Cygnus X-1 Observed from UHURU, in The Astrophysical Journal, vol. 166, 1999, pp. L1–L7, DOI:10.1086/180726.
J. Kristian et al., On the Optical Identification of Cygnus X-1, in The Astrophysical Journal, vol. 168, 1971, pp. L91–L93, DOI:10.1086/180790.
L. L. E. Braes, G. K. Miley, Physical Sciences: Detection of Radio Emission from Cygnus X-1, in Nature, vol. 232, n. 5308, 23 luglio 1971, p. 246, DOI:10.1038/232246a0, PMID 16062947.
L. L. E. Braes, G. K. Miley, Variable Radio Emission from X-Ray Sources, in Veröffentlichungen Remeis-Sternwarte Bamberg, vol. 9, n. 100, 1971, p. 173.
B. L. Webster, P. Murdin, Cygnus X-1—a Spectroscopic Binary with a Heavy Companion?, in Nature, vol. 235, n. 2, 1972, pp. 37-38, DOI:10.1038/235037a0.
C. T. Bolton, Identification of Cygnus X-1 with HDE 226868, in Nature, vol. 235, n. 2, 1972, pp. 271-273, DOI:10.1038/235271b0.
I. Bombaci, The maximum mass of a neutron star, in Astronomy and Astrophysics, vol. 305, 1996, pp. 871-877, arXiv:astro-ph/9608059.
H. L. Shipman, The implausible history of triple star models for Cygnus X-1 Evidence for a black hole, in Astrophysical Letters, vol. 16, n. 1, 1975, pp. 9-12, DOI:10.1016/S0304-8853(99)00384-4.
R. E. Rothschild et al., Millisecond Temporal Structure in Cygnus X-1, in The Astrophysical Journal, vol. 189, 1974, pp. 77-115, DOI:10.1086/181452.
E. Koerding, S. Jester, R. Fender, Accretion states and radio loudness in Active Galactic Nuclei: analogies with X-ray binaries, in Monthly Notices of the Royal Astronomical Society, vol. 372, n. 3, 2006, pp. 1366-1378, DOI:10.1111/j.1365-2966.2006.10954.x, arXiv:astro-ph/0608628.
S. F. Odenwald, P. R. Schwartz, An IRAS survey of star-forming regions toward Cygnus, in Astrophysical Journal, vol. 405, n. 2, marzo 1993, pp. 706-719, DOI:10.1086/172398. URL consultato il 28 luglio 2013.
N. Schneider et al., A new view of the Cygnus X region. KOSMA ¹³CO 2 to 1, 3 to 2, and ¹²CO 3 to 2 imaging, in Astronomy and Astrophysics, vol. 458, n. 3, novembre 2006, pp. 855-871, DOI:10.1051/0004-6361:20065088. URL consultato il 28 luglio 2013.
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