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Mu Aquarii

From Wikipedia, the free encyclopedia
Binary star system in the constellation Aquarius
Mu Aquarii
Location of μ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationAquarius[1]
Right ascension20h 52m 39.23277s[2]
Declination−08° 58′ 59.9499″[2]
Apparent magnitude (V)4.731[3]
Characteristics
Spectral typeA3m[4] orkA4hF1mF3 (III) EuSr[5]
U−Bcolor index+0.149[3]
B−Vcolor index+0.322[3]
Astrometry
Radial velocity (Rv)−9.1[6] km/s
Proper motion (μ)RA: +45.75mas/yr
Dec.: −33.59mas/yr
Parallax (π)20.74±0.29 mas[2]
Distance157 ± 2 ly
(48.2 ± 0.7 pc)
Absolute magnitude (MV)+1.31[1]
Orbit[7]
Period (P)1,566±3 d
Semi-major axis (a)≥ 67.06 Gm (0.4483 AU)
Eccentricity (e)0.23±0.19
Periastronepoch (T)2,410,497±52 JD
Semi-amplitude (K1)
(primary)		3.2±0.6 km/s
Details
A
Mass2.059±0.103[8] M☉
Radius3.151±0.158[8] R☉
Luminosity25.6±1.4[9] L☉
Surface gravity (log g)3.99[9] cgs
Temperature6,906+151
−405[9] K
Rotational velocity (v sin i)53.7[9] km/s
Other designations
μ Aqr,6Aquarii,BD−09 5598,FK5 1547,HD 198743,HIP 103045,HR 7990,SAO 144895,WDS 20527-0859A[10]
Database references
SIMBADdata

Mu Aquarii is the for abinary star[11] system in theequatorialconstellation ofAquarius. Its name is aBayer designation that isLatinized from μ Aquarii, and abbreviated Mu Aqr or μ Aqr. The star is visible to the naked eye with a combinedapparent visual magnitude of 4.7.[3] Based uponparallax measurements, the distance to this system is about 157light-years (48parsecs).[2] It is drifting closer to theSun with aradial velocity of −9.1 km/s.[6]

This star was tentatively identified as a single-linedspectroscopic binary byHelmut A. Abt in 1961.[12] It has anorbital period of 4.29 yr and aneccentricity (ovalness) of 0.23.[7] The pair have been resolved byspeckle interferometry, showing anangular separation of0.06″.[13]

The visiblespectrum matches astellar classification of A3m, with the 'm' suffix indicating that this is anAm, orchemically peculiar star.[4] A 2020 classification ofkA4hF1mF3 (III) EuSr,[5] indicates ionized calcium (k) lines match a class of A4, hydrogen lines (h) a class of F1, and metal lines (m) F3. There are also abundance anomalies of europium (Eu) and strontium (Sr). The primary has double the mass of the Sun and 3.5 times theSun's radius,[8] It is radiating 26 times theluminosity of the Sun from itsphotosphere at aneffective temperature of 6,906 K.[14]

This star together withν Aquarii isAlbulaan/ˌælbjəˈlɑːn/, derived from anArabic termal-bulaʽān (ألبولعان) meaning "the two swallowers". This star, along withε Aqr (Albali) andν Aqr (Albulaan), wereal Bulaʽ (البلع), the Swallower.[15][16] InChinese,女宿 (Nǚ Xiù), meaningGirl (asterism) (orWoman), refers to an asterism consisting of μ Aquarii,ε Aquarii,4 Aquarii,5 Aquarii and3 Aquarii.[17] Consequently, theChinese name for μ Aquarii itself is女宿二 (Nǚ Xiù èr, English:the Second Star of Girl / Woman.)[18]

References

[edit]
  1. ^abAnderson, 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.
  2. ^abcdvan 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.
  3. ^abcdGutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards",Publications of the Department of Astronomy University of Chile,1, Publicaciones Universidad de Chile, Department de Astronomy:1–17,Bibcode:1966PDAUC...1....1G.
  4. ^abCowley, 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.
  5. ^abMcGahee, Courtney; et al. (July 2020), "A Spectroscopic Classification Survey to Search for New ρ Puppis Stars",The Astronomical Journal,160 (1), id. 52,Bibcode:2020AJ....160...52M,doi:10.3847/1538-3881/ab974c.
  6. ^abWilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities".Carnegie Institute Washington D.C. Publication. Washington:Carnegie Institution of Washington.Bibcode:1953GCRV..C......0W.
  7. ^abAbt, H. A.; Levy, S. G. (October 1985), "Improved study of metallic-line binaries",The Astrophysical Journal Supplement Series,59:229–247,Bibcode:1985ApJS...59..229A,doi:10.1086/191070.
  8. ^abcKervella, Pierre; et al. (March 2019), "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly",Astronomy & Astrophysics,623: 23,arXiv:1811.08902,Bibcode:2019A&A...623A..72K,doi:10.1051/0004-6361/201834371,S2CID 119491061, A72.
  9. ^abcdSchröder, C.; et al. (January 2009),"Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo"(PDF),Astronomy and Astrophysics,493 (3):1099–1107,Bibcode:2009A&A...493.1099S,doi:10.1051/0004-6361:200810377[permanent dead link]
  10. ^"* 6 Aqr".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2012-07-01.
  11. ^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,S2CID 14878976.
  12. ^Abt, Helmut A. (March 1961), "The Frequency of Binaries among Metalmc-Line Stars",The Astrophysical Journal Supplement Series,6: 37,Bibcode:1961ApJS....6...37A,doi:10.1086/190060.
  13. ^Hartkopf, William I.; et al. (2000), "ICCD Speckle Observations of Binary Stars. XXIII. Measurements during 1982-1997 from Six Telescopes, with 14 New Orbits",The Astronomical Journal,119 (6): 3084,Bibcode:2000AJ....119.3084H,doi:10.1086/301402.
  14. ^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 atVizieR.
  15. ^Davis Jr., G. A. (October 1944), "The Pronunciations, Derivations, and Meanings of a Selected List of Star Names",Popular Astronomy,52 (3): 12,Bibcode:1944PA.....52....8D.
  16. ^Allen, R. H. (1963),Star Names: Their Lore and Meaning (Reprint ed.), New York: Dover Publications Inc, p. 53,ISBN 0-486-21079-0, retrieved2010-12-12.{{citation}}:ISBN / Date incompatibility (help)
  17. ^(in Chinese)中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005,ISBN 978-986-7332-25-7.
  18. ^(in Chinese)AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 14 日Archived 2011-05-22 at theWayback Machine

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