35 Cygni

{{short description|Binary star in the constellation Cygnus}}

{{Starbox begin

|name= 35 Cygni

}}

{{Starbox image

| image=

{{Location mark

|image=Cygnus constellation map.svg

|float=center

|alt=

|label=

|position=right

|width=280

|mark=Red circle.svg

|mark_width=10

|mark_link=35 Cygni

|x=399|y=542

}}

|caption=Location of 35 Cyg (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|20|18|39.06986}}{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|last1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 |s2cid=18759600}}

| dec = {{DEC|+34|58|57.9909}}

| appmag_v = 5.18{{cite journal|bibcode=2014AJ....147..137L|title=Parameters and Abundances in Luminous Stars|journal=The Astronomical Journal|volume=147|issue=6|pages=137|last1=Luck|first1=R. Earle|year=2014|doi=10.1088/0004-6256/147/6/137|doi-access=free}}

| constell = Cygnus

}}

{{Starbox character

| class = F6Ib{{cite journal|bibcode=2009ApJS..180..117A|title=MK Classifications of Spectroscopic Binaries|journal=The Astrophysical Journal Supplement|volume=180|pages=117–118|last1=Abt|first1=Helmut A.|year=2009|issue=1|doi=10.1088/0067-0049/180/1/117|s2cid=122811461 }}

| b-v = +0.62

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = −20.20{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}

| prop_mo_ra = −0.05

| prop_mo_dec = −3.77

| parallax = 1.03

| p_error = 0.21

| parallax_footnote =

| absmag_v = −3.99{{cite journal|bibcode=2012MNRAS.423.3268K|arxiv=1204.4115|title=Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants|journal=Monthly Notices of the Royal Astronomical Society|volume=423|issue=4|pages=3268|last1=Kovtyukh|first1=V. V.|last2=Gorlova|first2=N. I.|last3=Belik|first3=S. I.|year=2012|doi=10.1111/j.1365-2966.2012.21117.x|doi-access=free |s2cid=118683158}}

}}

{{Starbox detail

| mass = 10.0{{cite journal|bibcode=2012MNRAS.427...11L|title=Lithium abundance in atmospheres of F- and G-type supergiants and bright giants|journal=Monthly Notices of the Royal Astronomical Society|volume=427|pages=11–26|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Kaminsky|first3=Bogdan M.|last4=Pavlenko|first4=Yakov V.|last5=Poklad|first5=Dmitry B.|last6=Rachkovskaya|first6=Tamara M.|year=2012|issue=1|doi=10.1111/j.1365-2966.2012.21617.x|doi-access=free |arxiv = 1212.6057 |s2cid=119191810}}

| radius = 51{{cite journal|bibcode= 2001A&A...367..521P|title= Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics|journal= Astronomy and Astrophysics|volume= 367|issue= 2|pages= 521|last1= Pasinetti Fracassini|first1= L. E.|last2= Pastori|first2= L.|last3= Covino|first3= S.|last4= Pozzi|first4= A.|year= 2001|doi= 10.1051/0004-6361:20000451|arxiv = astro-ph/0012289 |s2cid= 425754}}

| luminosity = 7,093{{cite journal|bibcode= 2012MNRAS.427..343M|title= Fundamental parameters and infrared excesses of Hipparcos stars|journal= Monthly Notices of the Royal Astronomical Society|volume= 427|pages= 343–357|last1= McDonald|first1= I.|last2= Zijlstra|first2= A. A.|last3= Boyer|first3= M. L.|year= 2012|issue= 1|doi= 10.1111/j.1365-2966.2012.21873.x|doi-access= free|arxiv = 1208.2037 |s2cid= 118665352}}

| temperature = 6,360

| gravity = 1.5 - 2.4

| metal_fe = 0.02

| rotational_velocity = 3.5

| age_myr = 22{{cite journal|bibcode=2010MNRAS.402.1369L|arxiv=0911.1335|title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood|journal=Monthly Notices of the Royal Astronomical Society|volume=402|issue=2|pages=1369|last1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Rostopchin|first3=Sergey I.|last4=Rachkovskaya|first4=Tamara M.|last5=Poklad|first5=Dmitry B.|year=2010|doi=10.1111/j.1365-2966.2009.15979.x|doi-access=free |s2cid=119096173}}

}}

{{Starbox catalog

| names = 35 Cyg, HR 7770, BD+34°3967, HD 193370, SAO 69806, FK5 3627, HIP 100122

}}

{{Starbox reference

| Simbad=35+Cygni

}}

{{Starbox end}}

35 Cygni is a spectroscopic binary star in the constellation Cygnus. Its apparent magnitude is 5.18. Located around {{convert|1,000|pc|ly}} distant, its primary is a yellow supergiant of spectral type F6Ib, a massive star that has used up its core hydrogen and is now fusing heavier elements.

Yellow supergiants are usually variable, often Classical Cepheid variables, but 35 Cyg is notable for having an especially constant brightness.{{cite journal|bibcode=2000IBVS.4947....1A|title=On the Variability of A6 to F9 Supergiants|journal=Information Bulletin on Variable Stars|volume=4947|pages=1|last1=Adelman|first1=S. J.|last2=Cay|first2=I. H.|last3=Cay|first3=M. T.|last4=Kocer|first4=D.|year=2000}}

35 Cyg is a single-lined spectroscopic binary with a period of 2,440 days (over 6 years).{{cite journal|bibcode=2004A&A...424..727P|arxiv=astro-ph/0406573|title=SB9: The ninth catalogue of spectroscopic binary orbits|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727–732|last1=Pourbaix|first1=D.|last2=Tokovinin|first2=A. A.|last3=Batten|first3=A. H.|last4=Fekel|first4=F. C.|last5=Hartkopf|first5=W. I.|last6=Levato|first6=H.|last7=Morrell|first7=N. I.|author-link7=Nidia Morrell|last8=Torres|first8=G.|last9=Udry|first9=S.|year=2004|doi=10.1051/0004-6361:20041213|s2cid=119387088}} The secondary cannot be seen directly, nor can its spectral lines be identified but the overall spectrum can be match by a combination of an F4 supergiant and a less luminous B6.5 star.{{cite journal|bibcode= 1998ApJS..119...83P|title= Ultraviolet and Optical Studies of Binaries with Luminous Cool Primaries and Hot Companions. V. The Entire IUE Sample|journal= The Astrophysical Journal Supplement Series|volume= 119|pages= 83|last1= Parsons|first1= Sidney B.|last2= Ake|first2= Thomas B.|year= 1998|issue= 1|doi= 10.1086/313152|doi-access= free}}