59 Cygni
{{short description|Star in the constellation Cygnus}}
{{about|f1 Cygni|other stars with this Bayer designation|f Cygni}}
{{Starbox begin
| name = 59 Cygni
}}
{{Starbox image
| image = 250px
| caption = A visual band light curve of V832 Cygni. The main plot shows the long-term variability, and the inset plot shows the variation over a single orbital period. Adapted from Harmanec et al. (2002)
}}
{{Starbox observe
| epoch = J2000
| constell = Cygnus
| dec = {{DEC|+47|31|15.3789}}
}}
{{Starbox character
| type =
| class= B1.5Vnne + sdO + A3V + A8III + ?
| u-b =
| variable = γ Cas
}}
{{Starbox astrometry
| parallax = 2.5088
| p_error = 0.3226
}}
{{Starbox orbit
| period_unitless = {{Val|28.1871|0.0011|u=days}}
| eccentricity = {{Val|0.141|0.008}}
| periastron = {{Val|45677.6|0.3|u=HJD}}
| periarg = {{Val|257|4}}
| k1 = {{Val|11.7|0.9}}
| k2 = {{Val|121.3|1.1}}
}}
{{Starbox detail
| component1 = 59 Cyg Aa – Be star
| mass = 6.3–9.4
| radius = 5.5–7.0
| luminosity = 7,943
| temperature = {{Val|21800|700|fmt=commas}}
| gravity = {{Val|3.78|0.09}}
| metal_fe =
| rotational_velocity = {{val|379|27}}
| age_myr =
| component2 = 59 Cyg Aa – sdO
| mass2 = 0.62–0.91
| radius2 = 0.34–0.43
| luminosity2 = 1,000
| temperature2 = {{Val|52100|4800|fmt=commas}}
| gravity2 = {{Val|5.0|1.0}}
| rotational_velocity2 = < 40
}}
{{Starbox catalog
| names = {{odlist | V=V832 Cyg | B=f1 Cyg | F=59 Cyg | BD=+46°3133 | FK5=1551 | HD=200120 | HIP=103632 | HR=8047 | SAO=50335 | WDS=J20598+4731 }}
}}
{{Starbox reference
| Simbad=59+Cyg
}}
{{Starbox end}}
59 Cygni is a multiple star system in the northern constellation of Cygnus, located roughly 1,300 light years away from Earth. It is visible to the naked eye as a blue-white hued star with a combined apparent visual magnitude of 4.74.
The primary component and brightest member of this system, designated 59 Cyg Aa, is a rapidly rotating Be star with a stellar classification of B1.5 Vnne. This is a well-studied star thanks to pronounced spectral variations that have been observed since 1916, and two short-term shell star phases that were observed in 1973 and 1974–5. It is actually a confirmed spectroscopic binary system with a high temperature subdwarf O-type companion in a 28-day orbital period. The latter is heating the nearest side of the circumstellar gaseous disk that surrounds the primary.
Orbiting the primary pair is 59 Cyg Ab, a magnitude 7.64 A-type main-sequence star of class A3V, located at an angular separation of {{Val|0.200|u=arcsecond}}. A fourth component is a magnitude 9.8 A-type giant star of class A8III at a separation of {{val|20.2|u=arcsecond}} along a position angle (PA) of 352°, as of 2008. The fifth companion is magnitude 11.7 at a separation of {{Val|26.7|u=arcsecond}} and a PA of 141°. Gaia Data Release 2 suggests that the companions at {{val|20.2|u=arcsecond}} and {{Val|26.7|u=arcsecond}} are respectively {{val|382|ul=pc}} and {{val|366|u=pc}} away and moving in approximately the same direction as the primary triple.
References
{{reflist|refs=
{{cite simbad | title=59 Cyg | access-date=2019-01-17 }}
{{cite DR2|2163949423055031424}}
{{cite DR2|2163946429452212480}}
| last1=Samus | first1=N. N. | last2=Kazarovets | first2=E. V.
| last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N.
| last5=Pastukhova | first5=E. N. | display-authors=1
| title=General Catalogue of Variable Stars
| version=GCVS 5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 | postscript=. }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
| title=Properties and nature of Be stars. XXI. The long-term and the orbital variations of V832 Cyg = 59 Cyg
| last1=Harmanec | first1=P. | last2=Bozić | first2=H.
| last3=Percy | first3=J. R. | last4=Yang | first4=S.
| last5=Ruzdjak | first5=D. | last6=Sudar | first6=D.
| last7=Wolf | first7=M. | last8=Iliev | first8=L.
| last9=Huang | first9=L. | last10=Buil | first10=C.
| last11=Eenens | first11=P. | display-authors=1
| journal=Astronomy and Astrophysics | postscript=.
| volume=387 | pages=580–594 | date=May 2002
| issue=2 | doi=10.1051/0004-6361:20020453 | bibcode=2002A&A...387..580H | doi-access=free | arxiv=astro-ph/0401491 }}
| title=A catalogue of multiplicity among bright stellar systems
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869 | date=2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=.
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}
| last=Lesh | first=Janet Rountree | postscript=.
| title=The Kinematics of the Gould Belt: an Expanding Group?
| journal=Astrophysical Journal Supplement
| volume=17 | page=371 | date=December 1968
| doi=10.1086/190179 | bibcode=1968ApJS...17..371L | doi-access=free }}
| title=Far-ultraviolet Detection of the Suspected Subdwarf Companion to the Be Star 59 Cygni
| display-authors=1 | last1=Peters | first1=Geraldine J.
| last2=Pewett | first2=Tiffany D. | last3=Gies | first3=Douglas R.
| last4=Touhami | first4=Yamina N. | last5=Grundstrom | first5=Erika D.
| journal=The Astrophysical Journal
| volume=765 | issue=1 | id=2 | pages=8 | date=March 2013
| doi=10.1088/0004-637X/765/1/2 | bibcode=2013ApJ...765....2P
| arxiv=1301.0257 | s2cid=118450084 | postscript=. }}
}}
{{Stars of Cygnus}}
Category:B-type main-sequence stars
Category:Gamma Cassiopeiae variable stars
Category:Cygnus (constellation)