Mu Aquarii

{{short description|Binary star system in the constellation Aquarius}}

{{Starbox image

| image=

{{Location mark

| image=Aquarius_IAU.svg | alt= | float=center | width=260

| label= | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=μ Aquarii

| x%=74.8 | y%=44.5

}}

|caption=Location of μ Aquarii (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|20|52|39.23277}}

| dec = {{DEC|−08|58|59.9499}}

| appmag_v = 4.731

| constell = Aquarius

}}

{{Starbox character

| class = A3m or {{nowrap|kA4hF1mF3 (III) EuSr}}

| b-v = +0.322

| u-b = +0.149

| variable =

}}

{{Starbox astrometry

| radial_v = −9.1

| prop_mo_ra = +45.75

| prop_mo_dec = −33.59

| pa_footnote =

| parallax = 20.74

| p_error = 0.29

| parallax_footnote =

| absmag_v = +1.31

}}

{{Starbox orbit

| reference =

| period_unitless = {{val|1566|3|fmt=commas|u=days}}

| axis_unitless = ≥ {{Convert|67.06|Gm|AU|abbr=on|lk=on}}

| eccentricity = {{val|0.23|0.19}}

| periastron = {{val|2410497|52|fmt=commas|ul=JD}}

| k1 = {{val|3.2|0.6}}

}}

{{Starbox detail

| component1 = A

| mass = 2.059{{±|0.103}}

| radius = 3.151{{±|0.158}}

| luminosity = 25.6{{±|1.4}}

| temperature = {{val|6906|151|405|fmt=commas}}

| metal_fe =

| gravity = 3.99

| rotational_velocity = 53.7

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | B=μ Aqr | F=6Aquarii | BD=−09 5598 | FK5=1547 | HD=198743 | HIP=103045 | HR=7990 | SAO=144895 | WDS=20527-0859A }}

}}

{{starbox reference

| Simbad=*+mu+Aqr

}}

Mu Aquarii is the for a binary star system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from μ Aquarii, and abbreviated Mu Aqr or μ Aqr. The star is visible to the naked eye with a combined apparent visual magnitude of 4.7. Based upon parallax measurements, the distance to this system is about {{Convert|157|ly|pc|abbr=off|lk=on}}. It is drifting closer to the Sun with a radial velocity of −9.1 km/s.

This star was tentatively identified as a single-lined spectroscopic binary by Helmut A. Abt in 1961. It has an orbital period of {{convert|1566|days|years|disp=out}} and an eccentricity (ovalness) of 0.23. The pair have been resolved by speckle interferometry, showing an angular separation of {{val|0.06|ul=arcsecond}}.

The visible spectrum matches a stellar classification of A3m, with the 'm' suffix indicating that this is an Am, or chemically peculiar star. A 2020 classification of {{nowrap|kA4hF1mF3 (III) EuSr}}, 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 the Sun's radius, It is radiating 26 times the luminosity of the Sun from its photosphere at an effective temperature of 6,906 K.

This star together with ν Aquarii is Albulaan {{IPAc-en|,|æ|l|b|j|ə|'|l|ɑː|n}}, derived from an Arabic term al-bulaʽān (ألبولعان) meaning "the two swallowers". This star, along with ε Aqr (Albali) and ν Aqr (Albulaan), were al Bulaʽ (البلع), the Swallower. In Chinese, {{lang|zh|女宿}} ({{lang|zh-Latn|Nǚ Xiù}}), meaning Girl (asterism) (or Woman), refers to an asterism consisting of μ Aquarii, ε Aquarii, 4 Aquarii, 5 Aquarii and 3 Aquarii.{{in lang|zh}} 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}}. Consequently, the Chinese name for μ Aquarii itself is {{lang|zh|女宿二}} ({{lang|zh-Latn|Nǚ Xiù èr}}, {{langx|en|the Second Star of Girl / Woman}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060514.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 14 日] {{Webarchive|url=https://web.archive.org/web/20110522120505/http://aeea.nmns.edu.tw/2006/0605/ap060514.html |date=2011-05-22 }}

References

{{reflist|refs=

{{citation

| first=F. | last=van Leeuwen |date=November 2007

| title=Validation of the new Hipparcos reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664

| bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357

| postscript=. |arxiv = 0708.1752 | s2cid=18759600 }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{cite journal

| last=Wilson | first=Ralph Elmer | year=1953

| title=General Catalogue of Stellar Radial Velocities

| journal=Carnegie Institute Washington D.C. Publication

| publisher=Carnegie Institution of Washington

| location=Washington | bibcode=1953GCRV..C......0W }}

{{citation | display-authors=1 | last1=Schröder | first1=C. | last2=Reiners | first2=Ansgar | last3=Schmitt | first3=Jürgen H. M. M. | title=Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo | journal=Astronomy and Astrophysics | volume=493 | issue=3 | pages=1099–1107 | date=January 2009 | doi=10.1051/0004-6361:200810377 | bibcode=2009A&A...493.1099S | doi-access=free | url=http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2 }}{{Dead link|date=September 2023 |bot=InternetArchiveBot |fix-attempted=yes }}

{{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | journal=Publications of the Department of Astronomy University of Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | year=1966 | bibcode=1966PDAUC...1....1G | postscript=. }}

{{citation | display-authors=1 | last1=Cowley | first1=A. | last2=Cowley | first2=C. | last3=Jaschek | first3=M. | last4=Jaschek | first4=C. | title=A study of the bright A stars. I. A catalogue of spectral classifications | journal=Astronomical Journal | volume=74 | pages=375–406 |date=April 1969 | doi=10.1086/110819 | bibcode=1969AJ.....74..375C | postscript=. }}

{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}

{{citation | last1=Davis Jr. | first1=G. A. | bibcode=1944PA.....52....8D | title=The Pronunciations, Derivations, and Meanings of a Selected List of Star Names | journal=Popular Astronomy | volume=52 | issue=3 |date=October 1944 | page=12 | postscript=. }}

{{citation | last=Allen | first=R. H. | year=1963 | author-link=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/53 | access-date=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York | isbn=0-486-21079-0 | page=[https://archive.org/details/starnamestheirlo00alle/page/53 53] | postscript=. | url-access=registration }}

{{citation | postscript=.

| title=Improved study of metallic-line binaries

| last1=Abt | first1=H. A. | last2=Levy | first2=S. G.

| journal= The Astrophysical Journal Supplement Series

| volume=59 | pages=229–247 | date=October 1985

| doi=10.1086/191070 | bibcode=1985ApJS...59..229A }}

{{citation | postscript=.

| title=The Frequency of Binaries among Metalmc-Line Stars

| last=Abt | first=Helmut A.

| journal= The Astrophysical Journal Supplement Series

| volume=6 | page=37 | date=March 1961

| doi=10.1086/190060 | bibcode=1961ApJS....6...37A | doi-access=free}}

{{citation

| title=ICCD Speckle Observations of Binary Stars. XXIII. Measurements during 1982-1997 from Six Telescopes, with 14 New Orbits

| display-authors=1 | last1=Hartkopf | first1=William I.

| last2=Mason | first2=Brian D. | last3=McAlister | first3=Harold A.

| last4=Roberts | first4=Lewis C. | last5=Turner | first5=Nils H.

| last6=Ten Brummelaar | first6=Theo A. | last7=Prieto | first7=Cristina M.

| last8=Ling | first8=Josefina F. | last9=Franz | first9=Otto G.

| journal=The Astronomical Journal

| volume=119 | issue=6 | pages=3084 | year=2000

| doi=10.1086/301402 | doi-access=free

| bibcode=2000AJ....119.3084H | postscript=. }}

{{citation | postscript=.

| title=A Spectroscopic Classification Survey to Search for New ρ Puppis Stars

| display-authors=1 | last1=McGahee | first1=Courtney

| last2=Gray | first2=Richard O. | last3=Griffin | first3=R. E. M.

| last4=Birchard | first4=Mariah | last5=Day | first5=Jared

| journal=The Astronomical Journal

| volume=160 | issue=1 | at=id. 52 | date=July 2020

| doi=10.3847/1538-3881/ab974c | doi-access=free

| bibcode=2020AJ....160...52M }}

{{citation

| title=Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly

| last1=Kervella | first1=Pierre | last2=Arenou | first2=Frédéric

| last3=Mignard | first3=François | last4=Thévenin | first4=Frédéric

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=623 | id=A72 | pages=23 | date=March 2019

| arxiv=1811.08902 | bibcode=2019A&A...623A..72K

| doi=10.1051/0004-6361/201834371 | s2cid=119491061 | postscript=. }}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=20+52+39.2336-08+58+59.944&ident=HD+198743&submit=Aladin+previewer Image Mu Aquarii]

Category:Am stars

Category:Spectroscopic binaries

Category:Aquarius (constellation)