Astronomy:Mu Cygni
μ Cygni, Latinised as Mu Cygni, is a binary star[11] system in the northern constellation of Cygnus. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.49.[2] The system is located 72 light years distant from the Sun, based on parallax,[1] and is drifting further away with a radial velocity of +17 km/s.[4]
The pair have an orbital period of around 800 years, with a semimajor axis of 5″ and an eccentricity around 0.6.[12] The primary,[9] with an apparent magnitude of 4.69, is an F-type main-sequence star with a stellar classification of F6V.[3] It has 35% more mass than the Sun and 188% of the Sun's radius.[6] The star is spinning with a projected rotational velocity of 9.6 km/s. The secondary companion,[10] with an apparent magnitude of 6.12, is a G-type main-sequence star with a class of G2V.[3] It has a similar radius as the Sun and slightly more mass.[6]
Two reported additional components, C (apparent magnitude 12.93) and D (apparent magnitude 6.94), are believed to be optical doubles rather than part of the Mu Cygni system.[3] Component D is the more distant spectroscopic binary HD 206874 (HIP 107326), consisting of two early F-type subgiants.[13]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 Mason, Brian D. et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M Vizier catalog entry
- ↑ 4.0 4.1 Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics 521: A12, doi:10.1051/0004-6361/201014948, Bibcode: 2010A&A...521A..12M
- ↑ 5.0 5.1 5.2 5.3 Luck, R. Earle (2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 21. doi:10.3847/1538-3881/153/1/21. Bibcode: 2017AJ....153...21L.
- ↑ 6.0 6.1 6.2 6.3 6.4 Fuhrmann, Klaus (2011). "Nearby stars of the Galactic disc and halo - V". Monthly Notices of the Royal Astronomical Society 414 (4): 2893–2922. doi:10.1111/j.1365-2966.2011.18476.x. Bibcode: 2011MNRAS.414.2893F.
- ↑ Pourbaix, D. et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics 424 (2): 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ "CCDM J21442+2845AB". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CCDM+J21442%2B2845AB.
- ↑ 9.0 9.1 "HR 8309". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+8309.
- ↑ 10.0 10.1 "HR 8310". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+8310.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. Vizier catalog entry
- ↑ Malkov, O. Yu. et al. (October 2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics 546 (A69): A69, doi:10.1051/0004-6361/201219774, Bibcode: 2012A&A...546A..69M Vizier catalog entry
- ↑ Abt, Helmut A (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement 180 (1): 117–118. doi:10.1088/0067-0049/180/1/117. Bibcode: 2009ApJS..180..117A.
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