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Mu Andromedae

January 10, 2023

Mu 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]

μ 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
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]
Distance130 ± 4 ly
(40 ± 1 pc)
Absolute magnitude (MV)+0.86[5]
Orbit[6]
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
Mass2.0[7] M☉
Radius2.4[7] R☉
Luminosity21[7] L☉
Surface gravity (log g)3.99[7] cgs
Temperature7,959[8] K
Metallicity [Fe/H]+0.03[8] dex
Rotational velocity (v sin i)75[9] km/s
Age600[10] Myr
Other designations
μ Andromedae, μ And, Mu And, 37 Andromedae, BD+37°175, FK5 33, HD 5448, HIP 4436, HR 269, SAO 54281.
Database references
SIMBADdata

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

  1. ^ a b c d e f 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.
  2. ^ a b c d 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.
  3. ^ a b 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ a b 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.
  7. ^ a b c d e f 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.
  8. ^ a b c 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.
  9. ^ a b 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.
  10. ^ a b 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.
  11. ^ Reddy, Francis (2011), Celestial Delights: The Best Astronomical Events Through 2020 (3rd ed.), Springer, p. 236, ISBN 978-1461406099.
  12. ^ , 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.
  13. ^ (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

January 10, 2023
andromedae, andromedae, bayer, designation, star, northern, constellation, andromeda, apparent, visual, magnitude, making, readily, visible, naked, based, upon, parallax, measurements, approximately, light, years, parsecs, from, earth, constellation, star, sit. Mu Andromedae Mu And m Andromedae m 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 m AndromedaeLocation of m Andromedae circled Observation dataEpoch J2000 Equinox J2000Constellation AndromedaRight ascension 00h 56m 45 21211s 1 Declination 38 29 57 6380 1 Apparent magnitude V 3 87 2 CharacteristicsSpectral type A5 V 3 U B color index 0 15 2 B V color index 0 12 2 AstrometryRadial velocity Rv 7 6 4 km sProper motion m RA 153 48 1 mas yr Dec 36 49 1 mas yrParallax p 25 14 0 86 mas 1 Distance130 4 ly 40 1 pc Absolute magnitude MV 0 86 5 Orbit 6 Period P 550 7 0 2 dSemi major axis a 46 66 0 06 masEccentricity e 0 8405 0 0009Inclination i 52 5 0 3 Longitude of the node W 17 6 0 2 Periastron epoch T 55765 45 0 04 MJDArgument of periastron w secondary 168 9 0 3 Semi amplitude K1 primary 11 1 0 5 km sDetailsMass2 0 7 M Radius2 4 7 R Luminosity21 7 L Surface gravity log g 3 99 7 cgsTemperature7 959 8 KMetallicity Fe H 0 03 8 dexRotational velocity v sin i 75 9 km sAge600 10 MyrOther designationsm Andromedae m And Mu And 37 Andromedae BD 37 175 FK5 33 HD 5448 HIP 4436 HR 269 SAO 54281 Database referencesSIMBADdataThe 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 EditIn Chinese 奎宿 Kui Su meaning Legs asterism refers to an asterism consisting of m Andromedae h Andromedae 65 Piscium z Andromedae e Andromedae d Andromedae p Andromedae n Andromedae b Andromedae s Piscium t Piscium 91 Piscium y Piscium f Piscium x Piscium and ps Piscium Consequently the Chinese name for m Andromedae itself is 奎宿八 Kui Su ba English the Eighth Star of Legs 13 References Edit a b c d e f van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d 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 a b 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 a b Roettenbacher R M Monnier J D Korhonen H Aarnio A N Baron F Che X Harmon R O Kovari 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 z Andromedae from starspot asymmetry Nature 533 7602 217 220 arXiv 1709 10107 Bibcode 2016Natur 533 217R doi 10 1038 nature17444 PMID 27144357 S2CID 4466687 a b c d e f 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 amp AS 85 1015M a b c 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 amp A 347 876G a b Royer F Zorec J Gomez 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 amp A 463 671R doi 10 1051 0004 6361 20065224 S2CID 18475298 a b 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 Edithttp www alcyone software com cgi bin search pl object HR0269 Image m Andromedae Retrieved from https en wikipedia org w index php title Mu Andromedae amp oldid 1122461939, wikipedia, wiki, book, books, library,

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