A-type main sequence star in the constellation Cygnus
Iota2 Cygni , Latinized from ι2 Cygni and often simply called ι Cygni,[ 8] is a single[ 9] star in the constellation Cygnus . It is visible to the naked eye as a white-hued point of light with an apparent visual magnitude of 3.76.[ 2] Located around 121.3 light-years distant from the Sun based on parallax ,[ 1] it is drifting closer with a radial velocity of −19.5 km/s and is expected to come to within 92 light-years in around 783,000 years.[ 2]
This it is an A-type main-sequence star with a stellar classification of A5V,[ 3] a star that is currently fusing its core hydrogen . It is around 577[ 4] million years old and is spinning rapidly with a projected rotational velocity of 240 km/s.[ 6] The star has 1.8[ 4] times the mass of the Sun and 3.8[ 5] times the Sun's radius . It is radiating 35[ 5] times the luminosity of the Sun from its photosphere at an effective temperature of 8,216 K.[ 4] Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk .[ 10]
References
^ a b c d e f van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics . 474 (2): 653– 664. arXiv :0708.1752 . Bibcode :2007A&A...474..653V . doi :10.1051/0004-6361:20078357 . S2CID 18759600 .
^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv :1108.4971 . Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . S2CID 119257644 .
^ a b Chesneau, O.; et al. (2010). "Time, spatial, and spectral resolution of the Hα line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer" . Astronomy and Astrophysics . 521 : A5. arXiv :1007.2095 . Bibcode :2010A&A...521A...5C . doi :10.1051/0004-6361/201014509 . S2CID 10340205 .
^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal , 804 (2): 146, arXiv :1501.03154 , Bibcode :2015ApJ...804..146D , doi :10.1088/0004-637X/804/2/146 , S2CID 33401607 .
^ a b c d 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 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics , 537 : A120, arXiv :1201.2052 , Bibcode :2012A&A...537A.120Z , doi :10.1051/0004-6361/201117691 , S2CID 55586789 .
^ "iot02 Cyg" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-09-11 .
^ Kaler, Jim. "Kappa, Iota Cygni" . STARS . Retrieved 2016-05-19 .
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869– 879, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976
^ Montgomery, Sharon L.; Welsh, Barry Y. (October 2012). "Detection of Variable Gaseous Absorption Features in the Debris Disks Around Young A-type Stars" . Publications of the Astronomical Society of the Pacific . 124 (920): 1042– 1056. Bibcode :2012PASP..124.1042M . doi :10.1086/668293 .