Mu Ursae Majoris: Difference between revisions

Mu Ursae Majoris
	Script error: No such module "Location map".; Location of μ Ursae Majoris (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+3.06
Characteristics
Evolutionary stage	AGB
Spectral type	M0 IIIab
U−B Template:Engvar	+1.90
B−V Template:Engvar	+1.59
Variable type	suspected
Astrometry
Radial velocity (Rv)	Template:Val km/s
Proper motion (μ)	RA: –81.47 mas/yr ; Dec.: +35.34 mas/yr
Parallax (π)	14.16±0.54 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	Template:Val
Orbit
Period (P)	230.089 days
Semi-major axis (a)	0.0028″
Eccentricity (e)	0.061
Inclination (i)	13.6°
Periastron epoch (T)	2425577.030 JD
Argument of periastron (ω); (secondary)	236.4°
Semi-amplitude (K1); (primary)	7.40 km/s
Details
μ UMa A
Mass	6.3 Template:Solar mass
Radius	75 Template:Solar radius
Luminosity	977–1,200 Template:Solar luminosity
Surface gravity (log g)	1.0 cgs
Temperature	3,899 K
Metallicity [Fe/H]	+0.00 dex
Rotational velocity (v sin i)	7.5 km/s
μ UMa B
Mass	0.96 Template:Solar mass
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
	Tania Australis, Alkafzah al Thaniyah, μ Ursae Majoris, μ UMa, Mu UMa, 34 Ursae Majoris, BD+42 2115, FK5 386, GC 14232, HD 89758, HIP 50801, HR 4069, PPM 51850, SAO 43310
Database references
SIMBAD	data

VisualWikitext

Latest revision as of 13:54, 23 June 2025

Template:Short description

Script error: No such module "Check for unknown parameters".

Mu Ursae Majoris is a binary star in the constellation of Ursa Major, and possibly makes part of a triple star system. It has the proper name Tania Australis Template:IPAc-en,^[12]^[13] Mu Ursae Majoris it is Bayer designation. An apparent visual magnitude of +3.06^[2] places it among the brighter members of the constellation. Parallax measurements give a distance measurement of roughly Template:Convert, with a margin of error of 4%.^[1]

Stellar system

Mu Ursae Majoris is an evolved star that is currently in the red giant stage with a stellar classification of M0 IIIab.^[2] It has expanded to 75 times the radius of the Sun^[10] whilst the outer atmosphere has cooled to an effective temperature of 3,899 K,^[6] giving it the orange-red hued glow of an M-type star.^[14] Estimates of the luminosity range from 977^[10]–1,200^[6] times that of the Sun. It is classified as a suspected variable star with a brightness variation from magnitude 2.99^m to 3.33^m.^[5]

This is a spectroscopic binary star system with a companion a mere 0.2 AU from the primary, with an orbital period of 230 days.^[8]

In addition to the inner pair, a proper motion companion has a 99% chance to be related to this system. It has a very low mass of just 0.1 solar masses, and a projected separation of 3,900 astronomical units.^[15]

Nomenclature

μ Ursae Majoris (Latinised to Mu Ursae Majoris) is the star's Bayer designation. It can be abbreviated to abbreviated Mu UMa or μ UMa.

It bore the traditional names Tania (shared with Lambda Ursae Majoris) and Tania Australis. Tania comes from the Arabic phrase Template:Transliteration 'the Second Spring (of the Gazelle)'.^[16] and Australis (originally australis^[17]) is Latin for 'the south side'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)^[18] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016^[19] included a table of the first two batches of names approved by the WGSN; which included Tania Australis for this star.

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Three Steps, refers to an asterism consisting of Mu Ursae Majoris, Iota Ursae Majoris, Kappa Ursae Majoris, Lambda Ursae Majoris, Nu Ursae Majoris and Xi Ursae Majoris. Consequently, the Chinese name for Mu Ursae Majoris itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).^[20]

References

Template:Reflist

Template:Stars of Ursa Major

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[aaa474_2_653-1] ↑ ^a ^b ^c ^d ^e ^f Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653

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[aj135_1_209-6] ↑ ^a ^b ^c ^d ^e ^f ^g Cite error: Invalid <ref> tag; no text was provided for refs named aj135_1_209

[park2013-7] Cite error: Invalid <ref> tag; no text was provided for refs named park2013

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[Kervella2022-15] Cite error: Invalid <ref> tag; no text was provided for refs named Kervella2022

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@@ Line 48: / Line 48: @@
 }}
 {{Starbox detail
+ | component1  = μ UMa A
   | mass        = 6.3<ref name=kraicheva1980/>
   | radius      = 75<ref name=aaa498_2_489/>
@@ Line 56: / Line 57: @@
   | age_myr     =
   | rotational_velocity = 7.5<ref name=aj135_1_209/>
-  | component2 = companion
+  | component2 = μ UMa B
   | mass2 = 0.96<ref name=kraicheva1980/>
 }}
@@ Line 67: / Line 68: @@
 {{Starbox end}}
-'''Mu Ursae Majoris''' ('''μ&nbsp;Ursae Majoris''', abbreviated '''Mu&nbsp;UMa''', '''μ&nbsp;UMa'''), formally named '''Tania Australis''' {{IPAc-en|'|t|ei|n|i|@|_|ɔː|'|s|t|r|ei|l|I|s}},<ref name=Kunitzsch>{{cite book
+'''Mu Ursae Majoris''' is a [[binary star]] in the [[constellation]] of [[Ursa Major]], and possibly makes part of a triple star system. It has the proper name '''Tania Australis''' {{IPAc-en|'|t|ei|n|i|@|_|ɔː|'|s|t|r|ei|l|I|s}},<ref name=Kunitzsch>{{cite book
    |last1=Kunitzsch |first1=Paul
    |last2=Smart |first2=Tim
@@ Line 74: / Line 75: @@
    |publisher = Sky Pub |location = Cambridge, Massachusetts
    |isbn = 978-1-931559-44-7
-}}</ref><ref name="IAU-CSN"/> is a [[binary star]] in the [[constellation]] of [[Ursa Major]]. An [[apparent visual magnitude]] of +3.06<ref name=aaa352_495/> places it among the [[List of stars in Ursa Major|brighter members]] of the constellation. [[Parallax]] measurements give an estimated distance of roughly {{Convert|230|ly|pc|abbr=off|lk=on}} from the [[Sun]], with a [[margin of error]] of 4%.<ref name=aaa474_2_653/>
+}}</ref><ref name="IAU-CSN"/> {{nowrap|Mu Ursae Majoris}} it is [[Bayer designation]]. An [[apparent visual magnitude]] of +3.06<ref name=aaa352_495/> places it among the [[List of stars in Ursa Major|brighter members]] of the constellation. [[Parallax]] measurements give a distance measurement of roughly {{Convert|230|ly|pc|abbr=off|lk=on}}, with a [[margin of error]] of 4%.<ref name=aaa474_2_653/>
 ==Stellar system==
-Mu Ursae Majoris is an [[stellar evolution|evolved]] star that is currently in the [[red giant]] stage with a [[stellar classification]] of M0&nbsp;IIIab.<ref name=aaa352_495/> It has expanded to 75<ref name=aaa498_2_489/> times the radius of the Sun whilst the [[stellar atmosphere|outer atmosphere]] has cooled to an [[effective temperature]] of 3,899&nbsp;K,<ref name=aj135_1_209/> giving it the orange-red hued glow of an [[M-type star]].<ref name=csiro/> Estimates of the luminosity range from 977<ref name=aaa498_2_489/>–1,200<ref name=aj135_1_209/> times that of the Sun. It is classified as a suspected [[variable star]] with a brightness variation from magnitude 2.99<sup>m</sup> to 3.33<sup>m</sup>.<ref name=gcvs/>
+Mu Ursae Majoris is an [[stellar evolution|evolved]] star that is currently in the [[red giant]] stage with a [[stellar classification]] of M0&nbsp;IIIab.<ref name=aaa352_495/> It has expanded to 75 times the radius of the Sun<ref name=aaa498_2_489/> whilst the [[stellar atmosphere|outer atmosphere]] has cooled to an [[effective temperature]] of 3,899&nbsp;K,<ref name=aj135_1_209/> giving it the orange-red hued glow of an [[M-type star]].<ref name=csiro/> Estimates of the luminosity range from 977<ref name=aaa498_2_489/>–1,200<ref name=aj135_1_209/> times that of the Sun. It is classified as a suspected [[variable star]] with a brightness variation from magnitude 2.99<sup>m</sup> to 3.33<sup>m</sup>.<ref name=gcvs/>
 This is a [[spectroscopic binary]] star system with a companion a mere 0.2 [[astronomical unit|AU]] from the primary, with an [[orbital period]] of 230 days.<ref name=ren/>
+In addition to the inner pair, a [[proper motion companion]] has a 99% chance to be related to this system. It has a very low mass of just 0.1 solar masses, and a [[projected separation]] of 3,900&nbsp;[[astronomical unit]]s.<ref name=Kervella2022/>
 ==Nomenclature==
-''μ&nbsp;Ursae Majoris'' ([[Latinisation of names|Latinised]] to ''Mu Ursae Majoris'') is the star's [[Bayer designation]].
+''μ&nbsp;Ursae Majoris'' ([[Latinisation of names|Latinised]] to ''Mu Ursae Majoris'') is the star's [[Bayer designation]]. It can be abbreviated to abbreviated {{nowrap|Mu UMa}} or {{nowrap|μ UMa}}.
 It bore the traditional names ''Tania'' (shared with [[Lambda Ursae Majoris]]) and ''Tania Australis''. ''Tania'' comes from the [[Arabic]] phrase {{Transliteration|ar|''Al Fiḳrah al Thānia''}} 'the Second Spring (of the Gazelle)'.<ref name=rhallen1899/> and ''Australis'' (originally ''australis''<ref name=piazzi1814/>) is [[Latin]] for 'the south side'. In 2016, the [[International Astronomical Union]] organized a [[IAU Working Group on Star Names|Working Group on Star Names]] (WGSN)<ref name="WGSN"/> to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016<ref name="WGSN1"/> included a table of the first two batches of names approved by the WGSN; which included ''Tania Australis'' for this star.
@@ Line 93: / Line 96: @@
 <ref name=kraicheva1980>{{cite journal |last1=Kraicheva |first1=Z. |last2=Popova |first2=E. |last3=Tutukov |first3=A. |last4=Yungelson |first4=L. |title=Catalogue of physical parameters of spectroscopic binary stars. |journal=Bulletin d'Information du Centre de Donnees Stellaires |date=July 1980 |volume=19 |pages=71 |issn=1169-8837 |bibcode=1980BICDS..19...71K}}</ref>
-<ref name=park2013>{{citation | display-authors=1
+<ref name=park2013>{{cite journal | display-authors=1
   | last1=Park | first1=Sunkyung | last2=Kang | first2=Wonseok
   | last3=Lee | first3=Jeong-Eun | last4=Lee | first4=Sang-Gak
@@ Line 100: / Line 103: @@
   | volume=146 | issue=4 | pages=73 | year=2013
   | doi=10.1088/0004-6256/146/4/73 | bibcode=2013AJ....146...73P
-  | arxiv=1307.0592 | s2cid=119187733 | postscript=. }}</ref>
+  | arxiv=1307.0592 | s2cid=119187733 }}</ref>
+<ref name=Kervella2022>{{Cite journal |last=Kervella |first=Pierre |last2=Arenou |first2=Frédéric |last3=Thévenin |first3=Frédéric |date=January 2022 |title=Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs |journal=Astronomy and Astrophysics |language=en |volume=657 |pages=A7 |doi=10.1051/0004-6361/202142146 |doi-access=free |bibcode=2022A&A...657A...7K |arxiv=2109.10912 |issn=0004-6361}}</ref>
 <ref name=rhallen1899>{{cite web|url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Ursa_Major*.html |author=Richard Hinckley Allen |title=Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear |accessdate=2016-08-26}}</ref>
@@ Line 112: / Line 117: @@
 <ref name="IAU-CSN">{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt | title=IAU Catalog of Star Names |accessdate=28 July 2016}}</ref>
-<ref name=aaa474_2_653>{{citation | first1=Floor | last1=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | arxiv=0708.1752v1 | doi=10.1051/0004-6361:20078357 | journal=Astronomy and Astrophysics | s2cid=18759600 }} ''Note:'' see VizieR catalogue [http://vizier.u-strasbg.fr/viz-bin/Cat?I/311 I/311].</ref>
+<ref name=aaa474_2_653>{{cite journal | first1=Floor | last1=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | arxiv=0708.1752v1 | doi=10.1051/0004-6361:20078357 | journal=Astronomy and Astrophysics | s2cid=18759600 }} ''Note:'' see VizieR catalogue [http://vizier.u-strasbg.fr/viz-bin/Cat?I/311 I/311].</ref>
-<ref name=aaa352_495>{{citation | last1=Mallik | first1=Sushma V. | title=Lithium abundance and mass | journal=Astronomy and Astrophysics | volume=352 | pages=495–507 |date=December 1999 | bibcode=1999A&A...352..495M }}</ref>
+<ref name=aaa352_495>{{cite journal | last1=Mallik | first1=Sushma V. | title=Lithium abundance and mass | journal=Astronomy and Astrophysics | volume=352 | pages=495–507 |date=December 1999 | bibcode=1999A&A...352..495M }}</ref>
-<ref name=aaa338_623>{{citation | last1=Mallik | first1=Sushma V. | title=Chromospheric activity in cool stars and the lithium abundance | journal=Astronomy and Astrophysics | volume=338 | pages=623–636 |date=October 1998 | bibcode=1998A&A...338..623M }}</ref>
+<ref name=aaa338_623>{{cite journal | last1=Mallik | first1=Sushma V. | title=Chromospheric activity in cool stars and the lithium abundance | journal=Astronomy and Astrophysics | volume=338 | pages=623–636 |date=October 1998 | bibcode=1998A&A...338..623M }}</ref>
-<ref name=aj135_1_209>{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 |date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | doi-access=free }}</ref>
+<ref name=aj135_1_209>{{cite journal | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 |date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | doi-access=free }}</ref>
 <ref name=clpl4_99>{{cite journal | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | pages=99 | date=1966 | bibcode=1966CoLPL...4...99J }}</ref>
-<ref name=aaa498_2_489>{{citation | display-authors=1 | last1=Jorissen | first1=A. | last2=Frankowski | first2=A. | last3=Famaey | first3=B. | last4=van Eck | first4=S. | title=Spectroscopic binaries among Hipparcos M giants. III. The eccentricity - period diagram and mass-transfer signatures | journal=Astronomy and Astrophysics | volume=498 | issue=2 | pages=489–500 |date=May 2009 | doi=10.1051/0004-6361/200810703 | bibcode=2009A&A...498..489J |arxiv = 0901.0938 | s2cid=2754939 }}</ref>
+<ref name=aaa498_2_489>{{cite journal  | display-authors=1 | last1=Jorissen | first1=A. | last2=Frankowski | first2=A. | last3=Famaey | first3=B. | last4=van Eck | first4=S. | title=Spectroscopic binaries among Hipparcos M giants. III. The eccentricity - period diagram and mass-transfer signatures | journal=Astronomy and Astrophysics | volume=498 | issue=2 | pages=489–500 |date=May 2009 | doi=10.1051/0004-6361/200810703 | bibcode=2009A&A...498..489J |arxiv = 0901.0938 | s2cid=2754939 }}</ref>
-<ref name=csiro>{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=[[Commonwealth Scientific and Industrial Research Organisation]] | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 | archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | archive-date=March 18, 2012 | url-status=dead }}</ref>
+<ref name=csiro>{{cite web | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=[[Commonwealth Scientific and Industrial Research Organisation]] | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 | archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | archive-date=March 18, 2012 | url-status=dead }}</ref>
-<ref name=piazzi1814>{{citation | author-link=Giuseppe Piazzi | last1=Piazzi | first1=G. | title=The Palermo Catalogue | location=Palermo | date=1814 }}</ref>
+<ref name=piazzi1814>{{cite work | author-link=Giuseppe Piazzi | last1=Piazzi | first1=G. | title=The Palermo Catalogue | location=Palermo | date=1814 }}</ref>
 <ref name=ren>{{cite journal|bibcode=2013AJ....145...81R|title=Hipparcos Photocentric Orbits of 72 Single-lined Spectroscopic Binaries|journal=The Astronomical Journal|volume=145|issue=3|pages=81|last1=Ren|first1=Shulin|last2=Fu|first2=Yanning|year=2013|doi=10.1088/0004-6256/145/3/81|s2cid=120199240 |doi-access=free}}</ref>
@@ Line 132: / Line 137: @@
 <ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
-<ref name=Eggen1992>{{citation
+<ref name=Eggen1992>{{cite journal
   | last1=Eggen | first1=Olin J.
   | title=Asymptotic giant branch stars near the sun
-  | journal=Astronomical Journal | postscript=.
+  | journal=Astronomical Journal
   | volume=104 | issue=1 | pages=275–313 | date=July 1992
   | doi=10.1086/116239 | bibcode=1992AJ....104..275E }}</ref>

Observation data Epoch J2000 Equinox J2000
Script error: No such module "Location map". Location of μ Ursae Majoris (circled)
Constellation	Ursa Major
Right ascension	Template:RA^[1]
Declination	Template:DEC^[1]
Apparent magnitude (V)	+3.06^[2]
Characteristics
Evolutionary stage	AGB^[3]
Spectral type	M0 IIIab^[2]
U−B Template:Engvar	+1.90^[4]
B−V Template:Engvar	+1.59^[4]
Variable type	suspected^[5]
Astrometry

Radial velocity (R_v)	Template:Val^[6] km/s
Proper motion (μ)	RA: –81.47^[1] mas/yr Dec.: +35.34^[1] mas/yr
Parallax (π)	14.16±0.54 mas^[1]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (M_V)	Template:Val^[7]

Orbit^[8]
Period (P)	230.089 days
Semi-major axis (a)	0.0028″
Eccentricity (e)	0.061
Inclination (i)	13.6°
Periastron epoch (T)	2425577.030 JD
Argument of periastron (ω) (secondary)	236.4°
Semi-amplitude (K₁) (primary)	7.40 km/s
Details
μ UMa A
Mass	6.3^[9] Template:Solar mass
Radius	75^[10] Template:Solar radius
Luminosity	977^[10]–1,200^[6] Template:Solar luminosity
Surface gravity (log g)	1.0^[6] cgs
Temperature	3,899^[6] K
Metallicity [Fe/H]	+0.00^[11] dex
Rotational velocity (v sin i)	7.5^[6] km/s
μ UMa B
Mass	0.96^[9] Template:Solar mass
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Tania Australis, Alkafzah al Thaniyah, μ Ursae Majoris, μ UMa, Mu UMa, 34 Ursae Majoris, BD+42 2115, FK5 386, GC 14232, HD 89758, HIP 50801, HR 4069, PPM 51850, SAO 43310
Database references
SIMBAD	data

Mu Ursae Majoris: Difference between revisions

Latest revision as of 13:54, 23 June 2025

Stellar system

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