astro.wikisort.org - StarMu Andromedae (Mu And, μ Andromedae, μ And) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of 3.87,[2] making it readily visible to the naked eye. Based upon parallax measurements, it is approximately 130 light-years (40 parsecs) from Earth.[1] In the constellation, the star is situated about halfway between the bright star Mirach to the southwest and the Andromeda Galaxy (M31) to the northeast.[11]
Binary star in the constellation Andromeda
Mu Andromedae
Location of μ Andromedae (circled) |
Observation data Epoch J2000 Equinox J2000 |
Constellation |
Andromeda |
Right ascension |
00h 56m 45.21211s[1] |
Declination |
+38° 29′ 57.6380″[1] |
Apparent magnitude (V) |
3.87[2] |
Characteristics |
Spectral type |
A5 V[3] |
U−B color index |
+0.15[2] |
B−V color index |
+0.12[2] |
Astrometry |
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Radial velocity (Rv) | +7.6[4] km/s |
Proper motion (μ) | RA: +153.48[1] mas/yr Dec.: +36.49[1] mas/yr |
Parallax (π) | 25.14 ± 0.86 mas[1] |
Distance | 130 ± 4 ly (40 ± 1 pc) |
Absolute magnitude (MV) | +0.86[5] |
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Orbit[6] |
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Period (P) | 550.7 ± 0.2 d |
Semi-major axis (a) | 46.66 ± 0.06 mas |
Eccentricity (e) | 0.8405 ± 0.0009 |
Inclination (i) | 52.5 ± 0.3° |
Longitude of the node (Ω) | −17.6 ± 0.2° |
Periastron epoch (T) | 55765.45 ± 0.04 MJD |
Argument of periastron (ω) (secondary) | 168.9 ± 0.3° |
Semi-amplitude (K1) (primary) | 11.1 ± 0.5 km/s |
Details |
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Mass | 2.0[7] M☉ |
Radius | 2.4[7] R☉ |
Luminosity | 21[7] L☉ |
Surface gravity (log g) | 3.99[7] cgs |
Temperature | 7,959[8] K |
Metallicity [Fe/H] | +0.03[8] dex |
Rotational velocity (v sin i) | 75[9] km/s |
Age | 600[10] Myr |
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Other designations |
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μ Andromedae, μ And, Mu And, 37 Andromedae, BD+37°175, FK5 33, HD 5448, HIP 4436, HR 269, SAO 54281. |
Database references |
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SIMBAD | data |
The spectrum of this star matches a stellar classification of A5 V,[3] indicating that it is an A-type main sequence star. It has double the mass of the Sun and 2.4 times the Sun's radius.[7] The star is radiating about 21[7] times the luminosity of the Sun from its outer envelope at an effective temperature of 7,959 K,[8] giving it the characteristic white glow of an A-type star.[12] It is estimated to be about 600 million years old,[10] with a relatively high projected rotational velocity of 75 km/s.[9] Mu Andromedae has recently been found to be a binary system. The two stars orbit each other every 550.7 days.[6]
Naming
In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of μ Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, the Chinese name for μ Andromedae itself is 奎宿八 (Kuí Sù bā, English: the Eighth Star of Legs.)[13]
References
- van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
- 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, S2CID 119257644.
- Roettenbacher, R.M.; Monnier, J.D.; Korhonen, H.; Aarnio, A.N.; Baron, F.; Che, X.; Harmon, R.O.; Kővári, Zs.; Kraus, S.; Schaefer, G.H.; Torres, G.; Zhao, M.; Ten Brummelaar, T.A.; Sturmann, J.; Sturmann, L. (2016). "No Sun-like dynamo on the active star ζ Andromedae from starspot asymmetry". Nature. 533 (7602): 217–220. arXiv:1709.10107. Bibcode:2016Natur.533..217R. doi:10.1038/nature17444. PMID 27144357. S2CID 4466687.
- Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M.
- Gardiner, R. B.; Kupka, F.; Smalley, B. (July 1999), "Testing convection theories using Balmer line profiles of A, F, and G stars", Astronomy and Astrophysics, 347: 876–890, Bibcode:1999A&A...347..876G.
- Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- Rieke, G. H.; et al. (February 2005), "Decay of Planetary Debris Disks", The Astrophysical Journal, 620 (2): 1010–1026, Bibcode:2005ApJ...620.1010R, CiteSeerX 10.1.1.579.8956, doi:10.1086/426937.
- Reddy, Francis (2011), Celestial Delights: The Best Astronomical Events Through 2020 (3rd ed.), Springer, p. 236, ISBN 978-1461406099.
- "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
- (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
External links
Constellation of Andromeda |
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На других языках
[de] My Andromedae
μ Andromedae (Lambda Andromedae, kurz μ And) ist mit einer scheinbaren Helligkeit von 3,87m[2] ein mit dem bloßen Auge recht gut erkennbarer Stern des Sternbilds Andromeda. Er befindet sich etwa 4 Grad nordöstlich des hellen Sterns Mirach (β And), und entlang der Verbindungslinie beider Sterne noch einige Grad nordöstlich von μ And kann die Andromedagalaxie (M31) aufgefunden werden.[4][7] Nach Parallaxen-Messungen der Raumsonde Gaia ist μ And circa 122 Lichtjahre von der Erde entfernt.[1]
- [en] Mu Andromedae
[es] Mu Andromedae
Mu Andromedae (μ And / 37 Andromedae / HD 5448)[1][2] es una estrella en la constelación de Andrómeda de magnitud aparente +3,87. Se encuentra a 130 años luz del Sistema Solar.
[ru] Мю Андромеды
Мю Андромеды (лат. μ Andromedae), 37 Андромеды (лат. 37 Andromedae), HD 5448 — кратная звезда в созвездии Андромеды на расстоянии приблизительно 135 световых лет (около 41 парсека) от Солнца. Видимая звёздная величина звезды — +3,87[3]. Возраст звезды определён как около 600 млн лет.
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