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V1191 Cygni - Wikipedia

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V1191 Cygni
Observation data Epoch J2000 Equinox J2000
A visual band light curve for V1191 Cygni, adapted from Ostadnezhad et al. (2014)^[1]
Constellation	Cygnus
Right ascension	20^h 16^m 50.8045^s^[2]
Declination	+41° 57′ 41.360″^[2]
Apparent magnitude (V)	10.99^[3]
Characteristics
Spectral type	F6V + G5V^[4]
Apparent magnitude (B)	11.41^[3]
Apparent magnitude (R)	10.55^[5]
Apparent magnitude (I)	10.06^[6]
Apparent magnitude (J)	9.82^[7]
Apparent magnitude (H)	9.56^[7]
Apparent magnitude (K)	9.51^[7]
B−V color index	0.62^[8]
Variable type	W UMa^[9]
Astrometry
A
Proper motion (μ)	RA: 38.4 ± 1.7^[3] mas/yr Dec.: 25.1 ± 1.6^[3] mas/yr
Distance	278 ± 31^[10] pc
Absolute magnitude (M_V)	3.82^[10]
B
Absolute magnitude (M_V)	5.73^[10]
Orbit
Period (P)	0.3134 d^[11]
Semi-major axis (a)	2.182 `R`_☉^[12]
Details
A
Mass	1.29 ± 0.08^[10] `M`_☉
Radius	1.31 ± 0.18^[10] `R`_☉
Luminosity (bolometric)	2.71 ± 0.44^[10] `L`_☉
Surface gravity (log g)	4.31^[10] cgs
Temperature	6500^[10] K
Age	3.85 ± 0.21^[12] Gyr
B
Mass	0.13 ± 0.01^[10] `M`_☉
Radius	0.52 ± 0.15^[10] `R`_☉
Luminosity (bolometric)	0.46 ± 0.08^[10] `L`_☉
Surface gravity (log g)	4.12^[10] cgs
Temperature	6610 ± 200^[10] K
Age	3.85 ± 0.21^[12] Gyr
Other designations
GSC 03159-01512, 2MASS J20165081+4157413, SBC9 2996, TYC 3159-1512-1
Database references
SIMBAD	data

V1191 Cygni is the variable star designation for an overcontact binary star system in the constellation Cygnus.^[13] First found to be variable in 1965, it is a W Ursae Majoris variable with a maximum apparent magnitude 10.82. It drops by 0.33 magnitudes during primary eclipses with a period of 0.3134 days, while dropping by 0.29 magnitudes during secondary eclipses.^[11] The primary star, which is also the cooler star, appears to have a spectral type of F6V, while the secondary is slightly cooler with a spectral type of G5V.^[4] With a mass of 1.29 solar masses and a luminosity of 2.71 solar luminosities, it is slightly more massive and luminous than the sun, while the secondary is only around 1/10 as massive and less than half as luminous. With a separation of 2.20 solar radii, the mass transfer of about 2×10⁻⁷ solar masses per year from the secondary to the primary is one of the highest known for a system of its type.^[10]

V1191 Cygni is a W-type W UMa variable,^[8] meaning that the primary eclipse occurs when the less-massive component is eclipsed by the larger, more massive component, although the masses are unusually different for such a system.^[14] The current period is very short for a system of its spectral type, suggesting that the stars are relatively small for their mass and age,^[14] which is likely around 3.85 billion years.^[12] The pair's orbital period is increasing at a rate of over 4×10⁻⁷ days per year, one of the fastest known rates among contact binary systems,^[8] likely due to the high rate of mass transfer. In addition to the period increase, there is cyclic period change of 0.023 days over 26.7 years, caused by either a third body with a mass of 0.77 solar masses or magnetic activity cycles. The mass transfer will likely eventually cause the system to evolve into a single star with a very high rotation rate.^[13]

References

^ Ostadnezhad, S.; Delband, M.; Hasanzadeh, A. (August 2014). "Photometry, period variations and light curve analysis of eclipsing binary V1191 Cyg". New Astronomy. 31: 14–19. Bibcode:2014NewA...31...14O. doi:10.1016/j.newast.2014.02.001. Retrieved 22 December 2021.
^ ^a ^b Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. (1998). "The TYCHO Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
^ ^a ^b ^c ^d Høg, E.; et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
^ ^a ^b Avvakumova, E.A.; Malkov, O.Yu.; Kniazev, A.Yu. (2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten. 334 (8): 860–865. Bibcode:2013AN....334..860A. doi:10.1002/asna.201311942. hdl:10995/27061.
^ Ivanov, G. A. (2008). "Catalogue of stars with high-proper motions - version 2". Kinematika I Fizika Nebesnykh Tel. 24: 480. Bibcode:2008KFNT...24..480I.
^ Droege, Thomas F.; Richmond, Michael W.; Sallman, Michael P.; Creager, Robert P. (2006). "TASS Mark IV Photometric Survey of the Northern Sky". Publications of the Astronomical Society of the Pacific. 118 (850): 1666–1678. arXiv:astro-ph/0610529. Bibcode:2006PASP..118.1666D. doi:10.1086/510197. S2CID 11716917.
^ ^a ^b ^c Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
^ ^a ^b ^c Pribulla, T.; Vaňko, M.; Chochol, D. R.; Parimucha, Š.; Baluďanský, D. (2005). "Ccd Photometry of the Neglected Contact Binaries V344 Lac and V1191 Cyg". Astrophysics and Space Science. 296 (1–4): 281–284. Bibcode:2005Ap&SS.296..281P. doi:10.1007/s10509-005-4831-2. S2CID 189843557.
^ Mayer, P (1965). "Two new variable stars in the Cygnus". Bulletin of the Astronomical Institute of Czechoslovakia. 16: 255–256. Bibcode:1965BAICz..16..255M.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Ulaş, B.; Kalomeni, B.; Keskin, V.; Köse, O.; Yakut, K. (2012). "Marginally low mass ratio close binary system V1191 Cyg". New Astronomy. 17 (1): 46–49. arXiv:1107.0277. Bibcode:2012NewA...17...46U. doi:10.1016/j.newast.2011.06.002. S2CID 119251171.
^ ^a ^b Malkov, O. Yu.; Oblak, E.; Snegireva, E. A.; Torra, J. (2006). "A catalogue of eclipsing variables". Astronomy and Astrophysics. 446 (2): 785–789. Bibcode:2006A&A...446..785M. doi:10.1051/0004-6361:20053137. hdl:10995/73280.
^ ^a ^b ^c ^d Yildiz, M. (2013). "Origin of W UMa-type contact binaries - age and orbital evolution". Monthly Notices of the Royal Astronomical Society. 437 (1): 185–194. arXiv:1310.5526. Bibcode:2014MNRAS.437..185Y. doi:10.1093/mnras/stt1874. S2CID 119121897.
^ ^a ^b Zhu, L. Y.; Qian, S. B.; Soonthornthum, B.; He, J. J.; Liu, L. (2011). "Deep, Low Mass Ratio Overcontact Binary Systems. Xi. V1191 Cygni". The Astronomical Journal. 142 (4): 124. Bibcode:2011AJ....142..124Z. doi:10.1088/0004-6256/142/4/124.
^ ^a ^b Rucinski, S. M.; Pribulla, T.; Mochnacki, S. W.; Liokumovich, E.; Lu, W.; Debond, H.; De Ridder, A.; Karmo, T.; Rock, M.; Thomson, J. R.; Ogłoza, W.; Kaminski, K.; Ligeza, P. (2008). "Radial Velocity Studies of Close Binary Stars. Xiii". The Astronomical Journal. 136 (2): 586–593. arXiv:0805.1695. Bibcode:2008AJ....136..586R. doi:10.1088/0004-6256/136/2/586. S2CID 119225926.

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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