41 Cygni

41 Cygni is a single[9] star in the northern constellation of Cygnus, located near the southern border with Vulpecula. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.02.[2] The star lies at a distance of around 770 light years from the Sun, based on parallax, and is drifting closer with a radial velocity of −18 km/s.[4]

41 Cygni
Location of 41 Cyg (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 29m 23.73561s[1]
Declination +30° 22′ 06.7968″[1]
Apparent magnitude (V) 4.02[2]
Characteristics
Evolutionary stage supergiant[3]
Spectral type F5Ib-II[3]
B−V color index +0.38[2]
Variable type constant[3]
Astrometry
Radial velocity (Rv)−18.20[4] km/s
Proper motion (μ) RA: 6.89[1] mas/yr
Dec.: −0.87[1] mas/yr
Parallax (π)4.24 ± 0.16[1] mas
Distance770 ± 30 ly
(236 ± 9 pc)
Absolute magnitude (MV)−3.32[5]
Details
Mass5.3±0.4[6] M☉
Radius27.01+2.51
−1.01[7] R☉
Luminosity1,197±90[7] L☉
Surface gravity (log g)2.32±0.08[6] cgs
Temperature6533+126
−283[7] K
Metallicity [Fe/H]0.00±0.07[6] dex
Rotational velocity (v sin i)9.5±2.0[3] km/s
Age85[6] Myr
Other designations
41 Cyg, BD+29°4057, HD 195295, HIP 101076, HR 7834, SAO 70095[8]
Database references
SIMBADdata

This is a sharp-lined supergiant star[10] with a stellar classification of F5Ib-II.[3] It is 85[6] million years old with 5.3[6] times the mass of the Sun and is spinning with a projected rotational velocity of 9.5 km/s.[3] Having exhausted the supply of hydrogen at its core, the star has expanded to 27[7] times the Sun's radius. It is radiating about 1,200[7] times the Sun's luminosity from its swollen photosphere at an effective temperature of 6,533 K.[7]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  3. Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. Kovtyukh, V. V.; et al. (2012). "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society. 423 (4): 3268. arXiv:1204.4115. Bibcode:2012MNRAS.423.3268K. doi:10.1111/j.1365-2966.2012.21117.x.
  6. Lyubimkov, Leonid S.; et al. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 402 (2): 1369. arXiv:0911.1335. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x.
  7. 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.
  8. "41 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
  9. 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.
  10. Adelman, S. J.; et al. (January 2008). "Elemental abundance analyses with DAO spectrograms: XXXI. The early F supergiants ν Her (F2 II) and 41 Cyg (F5 Ib-II)". Astronomische Nachrichten. 329 (1): 26–38. Bibcode:2008AN....329....4A. doi:10.1002/asna.200710863.
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