Astronomy:17 Cygni

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Short description: Star in the constellation Cygnus
17 Cygni
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 46m 25.600s[1]
Declination +33° 43′ 39.35″[1]
Apparent magnitude (V) 5.00[2] + 8.56[3]
Characteristics
Spectral type F7 V[2] + K6 V + K3 V + K3 V[3] + M0.4[4]
B−V color index 0.46[2]
Astrometry
Radial velocity (Rv)+4.1[5] km/s
Proper motion (μ) RA: +22.745[1] mas/yr
Dec.: –448.311[1] mas/yr
Parallax (π)47.6516 ± 0.0675[1] mas
Distance68.45 ± 0.10 ly
(20.99 ± 0.03 pc)
Absolute magnitude (MV)3.40[2]
Details
17 Cyg A
Mass1.24[6] M☉
Radius1.538[7] R☉
Luminosity3.66[8] L☉
Surface gravity (log g)4.262[8] cgs
Temperature6,455[8] K
Metallicity [Fe/H]0.027[8] dex
Rotational velocity (v sin i)9[2] km/s
Age2.8[9] Gyr
17 Cyg B
Mass0.65 M☉
Other designations
17 Cyg, BD+33°3587, GJ 9670, HD 187013, HIP 97295, HR 7534, SAO 68827[10]
Database references
SIMBADdata

17 Cygni is the Flamsteed designation for a multiple star system[3] in the northern constellation of Cygnus. It has an apparent visual magnitude of 5.00,[2] so, according to the Bortle scale, it is visible from suburban skies at night. Measurements of the annual parallax find a shift of 0.0477″,[1] which is equivalent to a distance of around 68.5 ly (21.0 pc) from the Sun. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.451″/year.[11]

This system consists of two visual binary systems that were discovered by John Herschel in the 1820s. Components A and B form a bright, wide pair with an angular separation of 26.0 arcsecond and an estimated orbital period of ~6,200 years. The faint, close system consists of components F and G with a separation of 2.6 arcsecond and a period of 238 years. The two binaries form a hierarchical system with a separation of about 800 arcseconds and orbital period of 3.7 million years or more.[3] At an angular separation of 791.40 arcseconds is a proper motion companion with a classification of M0.4, indicating this is a red dwarf star. At the estimated distance of the pair, this is equal to a projected separation of 16,320 AU.[4] Although the CCDM lists four other companions, these are not associated with the system.[12]

The stellar classification of the primary star, component A, is F7 V,[2] which means it is a main sequence star like the Sun. The star has 1.24[6] times the mass of the Sun and 1.54[7] times the Sun's radius. It is some 2.8[9] billion years old and shines with 3.66[8] times the Sun's luminosity. The effective temperature of the stellar atmosphere is 6,455[8] K, giving it the yellow-white hued glow of an F-type star.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Takeda, Yoichi et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan 57 (1): 13–25, doi:10.1093/pasj/57.1.13, Bibcode: 2005PASJ...57...13T. 
  3. ↑ 3.0 3.1 3.2 3.3 Romanenko, L. G. (March 2017), "A dynamical study of the multiple system 17 Cygni ABFG", Astronomy Reports 61 (3): 206–220, doi:10.1134/S1063772917020056, Bibcode: 2017ARep...61..206R. 
  4. ↑ 4.0 4.1 Dhital, Saurav et al. (June 2010), "Sloan Low-mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs", The Astronomical Journal 139 (6): 2566–2586, doi:10.1088/0004-6256/139/6/2566, Bibcode: 2010AJ....139.2566D. 
  5. ↑ Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14,000 F and G dwarfs", Astronomy and Astrophysics 418 (3): 989–1019, doi:10.1051/0004-6361:20035959, Bibcode: 2004A&A...418..989N. 
  6. ↑ 6.0 6.1 Halbwachs, J. -L et al. (2018), "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs", Astronomy and Astrophysics 619: A81, doi:10.1051/0004-6361/201833377, Bibcode: 2018A&A...619A..81H. 
  7. ↑ 7.0 7.1 Schofield, Mathew et al. (2019), "The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite", The Astrophysical Journal Supplement Series 241 (1): 12, doi:10.3847/1538-4365/ab04f5, Bibcode: 2019ApJS..241...12S. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Takeda, Yoichi (April 2007), "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database", Publications of the Astronomical Society of Japan 59 (2): 335–356, doi:10.1093/pasj/59.2.335, Bibcode: 2007PASJ...59..335T. 
  9. ↑ 9.0 9.1 Holmberg, J. et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H. 
  10. ↑ "* 17 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+17+Cyg. 
  11. ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483–1522, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L. 
  12. ↑ Phillips, N. M. et al. (April 2010), "Target selection for the SUNS and DEBRIS surveys for debris discs in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society 403 (3): 1089–1101, doi:10.1111/j.1365-2966.2009.15641.x, Bibcode: 2010MNRAS.403.1089P.  See the note for F094.
  13. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16. 

Coordinates: Sky map 19h 46m 25.60s, +33° 43′ 39.35″



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