Astronomy:Iota1 Cygni
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 27m 25.96022s[2] |
| Declination | +52° 19′ 13.5871″[2] |
| Apparent magnitude (V) | 5.73[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A1V[4] |
| B−V color index | −0.002±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | +1.90[5] km/s |
| Proper motion (μ) | RA: −12.639[2] mas/yr Dec.: −27.567[2] mas/yr |
| Parallax (π) | 8.4332 ± 0.0867[2] mas |
| Distance | 387 ± 4 ly (119 ± 1 pc) |
| Absolute magnitude (MV) | +0.57[1] |
| Details | |
| Mass | 2.59±0.03[3] M☉ |
| Radius | 3.0[6] R☉ |
| Luminosity | 74.1+11.0 −20.5[7] L☉ |
| Surface gravity (log g) | 4.18[7] cgs |
| Temperature | 9,683+89 −178[3] K |
| Metallicity [Fe/H] | 0.00[8] dex |
| Rotational velocity (v sin i) | 51.6±2.2[7] km/s |
| Age | 386[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Iota1 Cygni is a probable binary star[7] 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.[10] It is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 5.75.[9] The system is located approximately 387 light years away based on parallax,[2] and it is drifting further away with a radial velocity of +2 km/s.[5]
This is a candidate double-lined spectroscopic binary system.[7] It has a stellar classification of A1V,[4] suggesting the primary component is an A-type main-sequence star. The star is about 400 million years old[8] with a moderate rotation rate, showing a projected rotational velocity of 52 km/s.[7] It has 2.6 times the mass of the Sun[3] and is radiating 74 times the Sun's luminosity[7] from its photosphere at an effective temperature of 9,683 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 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
- ↑ 5.0 5.1 Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, 30, University of Toronto: International Astronomical Union, p. 57, Bibcode: 1967IAUS...30...57E.
- ↑ Stassun, Keivan G. et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal 158 (4): 138, doi:10.3847/1538-3881/ab3467, Bibcode: 2019AJ....158..138S.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Royer, F. et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics 562: 21, doi:10.1051/0004-6361/201322762, A84, Bibcode: 2014A&A...562A..84R.
- ↑ 8.0 8.1 8.2 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
- ↑ 9.0 9.1 "iot01 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot01+Cyg.
- ↑ Kaler, James B. (September 11, 2015), "Kappa, Iota, and Iota-1 Cygni, a three-for-one-special", Stars, http://stars.astro.illinois.edu/sow/kappacyg.html, retrieved 2019-09-10.
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