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V1057 Cygni - Wikipedia

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V1057 Cygni
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
A visual band light curve for V1057 Cygni. The main plot shows the long-term variability, and the inset shows the short-term variability. Adapted from Kopatskaya et al. (2002)^[1] and Clarke et al. (2005).^[2]
Constellation	Cygnus
Right ascension	20^h 58^m 53.73367^s^[3]
Declination	+44° 15′ 28.3847″^[3]
Apparent magnitude (V)	12.43±0.03^[4]
Characteristics
Spectral type	F7/G3 I/IIe^[5]
B−V color index	1.93^[6]
Variable type	FU Ori
Astrometry

Proper motion (μ)	RA: −2.793^[3] mas/yr Dec.: −3.813^[3] mas/yr
Parallax (π)	1.0864 ± 0.0388 mas^[3]
Distance	3,000 ± 100 ly (920 ± 30 pc)

Details

Radius	16.2+1.2 −3.2^[3] `R`_☉
Luminosity	38.3±2.0^[3] `L`_☉
Temperature	3,565+414 −127^[3] K

Other designations
V1057 Cyg, LkHα 190, AAVSO 2055+43^[7]
Database references
SIMBAD	data

V1057 Cygni is a suspected binary star^[8] system in the northern constellation of Cygnus. It is a variable star of the FU Orionis-type, and was the second FU Orionis-type variable to be discovered. The system is located at a distance of approximately 3,000 light years from the Sun,^[3] in the North America Nebula.^[4] It has an apparent visual magnitude of around 12.4.^[4]

The initial classification of the primary was as a young T Tauri star.^[4] During 1969–1970 it underwent a nova-like outburst, increasing in brightness by five magnitudes and emitting a strong mass outflow. For the next ten years the brightness stayed at a plateau before decreasing rapidly in the mid–1990s, accompanied by a change in its spectrum. As of 2013, it is 1.5 magnitudes brighter than it was before the nova-like event.^[8] The mass of FU Ori objects is estimated to be in the range of 0.3–0.7 M_☉.^[4]

A faint binary companion was discovered in 2016, and designated component B. It is located at a projected separation of 30±5 AU from the primary, with a possible orbital period of ~300 years. The 1970 outburst of the primary may have been caused by torque of its accretion disk by the companion.^[4]

References

^ Kopatskaya, E. N.; Grinin, V. P.; Shakhovskoi, D. N.; Shulov, O. S. (April 2002). "Results of Photometric and Polarimetric Observations of the Fuor V1057 Cyg from the Time of an Outburst to the Present". Astrophysics. 45 (2): 143–149. Bibcode:2002Ap.....45..143K. doi:10.1023/A:1016052529802. S2CID 117012043. Retrieved 21 December 2021.
^ Clarke, C.; Lodato, G.; Melnikov, S. Y.; Ibrahimov, M. A. (August 2005). "The photometric evolution of FU Orionis objects: disc instability and wind–envelope interaction". Monthly Notices of the Royal Astronomical Society. 361 (3): 942–954. arXiv:astro-ph/0505515. Bibcode:2005MNRAS.361..942C. doi:10.1111/j.1365-2966.2005.09231.x.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f Green, Joel D.; et al. (October 2016). "Testing the Binary Trigger Hypothesis in FUors". The Astrophysical Journal. 830 (1): 5. arXiv:1605.03270. Bibcode:2016ApJ...830...29G. doi:10.3847/0004-637X/830/1/29. S2CID 118652194. 29.
^ Herbig, G. H.; et al. (2003). "High-Resolution Spectroscopy of FU Orionis Stars". The Astrophysical Journal. 595 (1): 384–411. arXiv:astro-ph/0306559. Bibcode:2003ApJ...595..384H. doi:10.1086/377194. S2CID 119436366.
^ Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. 1322 (2): 44. arXiv:1212.6182. Bibcode:2012yCat.1322....0Z. doi:10.1088/0004-6256/145/2/44. S2CID 119299381.
^ "LkHA 190". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-16.
^ ^a ^b Kopatskaya, E. N.; et al. (September 2013). "Photometric behaviour of the FU Orionis type star, V1057 Cygni, during the last 25 years". Monthly Notices of the Royal Astronomical Society. 434 (1): 38–45. Bibcode:2013MNRAS.434...38K. doi:10.1093/mnras/stt963.

Constellation of Cygnus

List of stars in Cygnus

Stars

Bayer	α (Deneb) β (Albireo) γ (Sadr) δ (Fawaris) ε (Aljanah) ζ η θ ι¹ ι² κ λ μ ν ξ o¹ o² ο³ π¹ (Azelfafage) π² ρ σ τ υ φ χ ψ ω¹ ω² P Q
Flamsteed	2 4 8 9 15 16 (c) 17 20 (d) 22 23 26 (e) 27 (b¹) 28 (b²) 29 (b³) 33 35 39 41 47 52 55 56 57 59 (f¹) 61 63 (f²) 68 (A) 71 (g) 72 74 75
Variable	R T W X Y RW SS SU TT AZ BC BI CH KY V380 V389 V404 V476 V1027 V1057 V1143 V1191 V1334 V1489 V1500 V1668 V1794 V1974 V2214 V2513
HR	7633 7767 7912 8193
HD	185269 185435 187123 188753 190655 191806 197037
Gliese	777 806 1245
Kepler	2 3 5 6 11 15 16 17 18 22 23 27 28 29 31 32 33 34 35 36 39 40 41 42 43 44 45 47 51 56 61 63 64 (PH1) 66 67 68 69 70 78 80 84 86 (PH2) 87 89 107 167 182 186 223 289 371 385 411 419 432 445 451 452 560 737 1229 1520 1625 1649 1708
WR	133 134 135 136 137 138a 140 142 147 148 150
Other	AFGL 2591 BD+40° 4210 BD+43 3654 Cygnus OB2 #8A Cygnus OB2 #12 Cygnus X-1 Cygnus X-3 G79.29+0.46 G 208-44 G 208-45 GSC 03949-00967 HAT-P-17 KELT-9 KELT-20 KIC 8462852 KIC 9832227 KIC 9970396 KIC 11026764 KIC 11145123 KOI-5 KOI-74 KOI-81 KOI-256 MWC 349 N6946-BH1 PSR J2032+4127 SPECULOOS-3 W75N(B)-VLA2 WASP-48 WISE J2000+3629 Wolf 1069

Star
clusters

Association	Cygnus OB2 Cygnus OB7 Cygnus OB9
Open	Berkeley 86 DR 6 IC 5146 Messier 29 Messier 39 NGC 6811 NGC 6819 NGC 6834 NGC 6866 NGC 6871 NGC 6910

Molecular
clouds

Cygnus X (including DR 21)

Nebulae

Dark	Barnard 146 Barnard 147 IC 5146 L1014
H II	NGC 6914 North America Nebula Pelican Nebula Sadr Region Sh2-101 Sh2-106
Planetary	Abell 78 Egg Nebula IRAS 19475+3119 IRAS 20324+4057 Kronberger 61 M1-92 NGC 6826 NGC 6881 NGC 6884 NGC 7008 NGC 7026 NGC 7027 NGC 7048 Soap Bubble Nebula
WR	Crescent Nebula
SNR	Cygnus Loop (including Veil Nebula)

Galaxies

NGC	6801 6946 7013
Other	3C 438 4C +48.48 Cygnus A ZTF J203349.8+322901.1

Exoplanets

Kepler	2b 3b 3c 5b 6b 11b 15b 16b 17b 22b 23b 28b 32b 33b 34b 36b 39b 40b 41b 47b 56b 61b 64b (PH1b) 68b 69b 70b 78b 87c 186b e f 371b c 409b 419b 432b 451b 452b 560b 737b 1229b 1520b 1625b 1652b 1658b 1649b c 1708b
Other	b³ Cygni b HD 185269 b HD 187123 b c HD 191806 b KELT-9b KELT-20b TrES-5b

Exomoons

Kepler	1625b I 1708b I

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