Iota1 Cygni

Iota1 Cygni, Latinized from ι1 Cygni, is a probable binary star[6] system in the northern constellation Cygnus, and is separated by less than a degree from its brighter visual neighbor, Iota2 Cygni.[9] It is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 5.75.[8] The system is located approximately 387 light years away based on parallax,[1] and it is drifting further away with a radial velocity of +2 km/s.[5]

For other stars with this Bayer designation, see ι Cygni.
Iota1 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 27m 25.96022s[1]
Declination 52° 19′ 13.5871″[1]
Apparent magnitude (V) 5.73[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A1V[4]
B−V color index −0.002±0.002[2]
Astrometry
Radial velocity (Rv)+1.90[5] km/s
Proper motion (μ) RA: -12.639[1] mas/yr
Dec.: -27.567[1] mas/yr
Parallax (π)8.4332 ± 0.0867 mas[1]
Distance387 ± 4 ly
(119 ± 1 pc)
Absolute magnitude (MV)+0.57[2]
Details
Mass2.59±0.03[3] M☉
Luminosity74.1+11.0
−20.5[6] L☉
Surface gravity (log g)4.18[6] cgs
Temperature9,683+89
−178[3] K
Rotational velocity (v sin i)51.6±2.2[6] km/s
Age404[7] Myr
Other designations
ι1 Cyg, 7 Cygni, BD+52° 2434, HD 183534, HIP 95656, HR 7408, SAO 31673[8]
Database references
SIMBADdata

This is a candidate double-lined spectroscopic binary system.[6] It has a stellar classification of A1V,[4] suggesting the primary component is an A-type main-sequence star. The star is about 400[7] million years old with a moderate rotation rate, showing a projected rotational velocity of 52 km/s.[6] It has 2.6[3] times the mass of the Sun and is radiating 74[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,683 K.[3]

References
  1. 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.
  2. 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.
  3. Zorec, J.; Royer, F. (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.
  4. Jaschek, M. (July 1978), "Catalogue of selected spectral types in the MK system", Bulletin d'Information du Centre de Données Stellaires, 15 (121): 121, Bibcode:1978BICDS..15..121J. Vizier catalog entry
  5. Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
  6. Royer, F.; et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics, 562: 21, arXiv:1401.2372, Bibcode:2014A&A...562A..84R, doi:10.1051/0004-6361/201322762, S2CID 54511685, A84.
  7. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  8. "iot01 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-10.
  9. Kaler, James B. (September 11, 2015), "Kappa, Iota, and Iota-1 Cygni, a three-for-one-special", Stars, retrieved 2019-09-10.
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