Iota1 Cygni

Iota1 Cygni
Location of ι1 Cygni (circled in red)
Observation data
Epoch J2000      Equinox ICRS
Constellation Cygnus
Right ascension 19h 27m 25.96022s
Declination +52° 19′ 13.5871″
Apparent magnitude (V) 5.73
Characteristics
Evolutionary stage main sequence
Spectral type A1V
B−V color index −0.002±0.002
Astrometry
Radial velocity (Rv)+1.90 km/s
Proper motion (μ) RA: −12.639 mas/yr
Dec.: −27.567 mas/yr
Parallax (π)8.4332±0.0867 mas
Distance387 ± 4 ly
(119 ± 1 pc)
Absolute magnitude (MV)+0.57
Details
Mass2.59±0.03 M☉
Radius3.0 R☉
Luminosity74.1+11.0
−20.5 L☉
Surface gravity (log g)4.18 cgs
Temperature9,683+89
−178 K
Metallicity [Fe/H]0.00 dex
Rotational velocity (v sin i)51.6±2.2 km/s
Age386 Myr
Other designations
ι1 Cyg, 7 Cygni, BD+52°2434, HD 183534, HIP 95656, HR 7408, SAO 31673
Database references
SIMBADdata

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

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

References

  1. 1 2 3 4 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 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.
  3. 1 2 3 4 5 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. 1 2 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. 1 2 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. ↑ Stassun, Keivan G.; et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467.
  7. 1 2 3 4 5 6 7 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.
  8. 1 2 3 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.
  9. 1 2 "iot01 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-10.
  10. ↑ Kaler, James B. (September 11, 2015), "Kappa, Iota, and Iota-1 Cygni, a three-for-one-special", Stars, retrieved 2019-09-10.