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Mu Ursae Majoris

March 11, 2023

Mu Ursae Majoris (μ Ursae Majoris, abbreviated Mu UMa, μ UMa), formally named Tania Australis /ˈteɪniə ɔːˈstreɪlɪs/,[12][13] is a binary star in the constellation of Ursa Major. An apparent visual magnitude of +3.06[2] places it among the brighter members of the constellation. Parallax measurements give an estimated distance of roughly 230 light-years (71 parsecs) from the Sun, with a margin of error of 4%.[1]

Mu Ursae Majoris

Location of μ Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 10h 22m 19.73976s[1]
Declination +41° 29′ 58.2691″[1]
Apparent magnitude (V) +3.06[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M0 IIIab[2]
U−B color index +1.90[4]
B−V color index +1.59[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)–21.30 ± 1.66[6] km/s
Proper motion (μ) RA: –81.47[1] mas/yr
Dec.: +35.34[1] mas/yr
Parallax (π)17.7987 ± 0.3933 mas[7]
Distance183 ± 4 ly
(56 ± 1 pc)
Absolute magnitude (MV)−1.11±0.083[8]
Orbit[9]
Period (P)230.089 days
Semi-major axis (a).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
Radius75[10] R☉
Luminosity977[10]–1,200[6] L☉
Surface gravity (log g)1.0[6] cgs
Temperature3,899[6] K
Metallicity [Fe/H]+0.00[11] dex
Rotational velocity (v sin i)7.5[6] km/s
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
SIMBADdata

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[10] times the radius of the Sun 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 2.99m to 3.33m.[5]

This is a spectroscopic binary star system with a companion a mere 0.2 AU from the primary, assuming a distance of 71 parsecs, with an orbital period of 230 days.[9]

Nomenclature

μ Ursae Majoris (Latinised to Mu Ursae Majoris) is the star's Bayer designation.

It bore the traditional names Tania (shared with Lambda Ursae Majoris) and Tania Australis. Tania comes from the Arabic phrase Al Fiḳrah al Thānia 'the Second Spring (of the Gazelle)'.[15] and Australis (originally australis[16]) is Latin for 'the south side'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[17] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[18] included a table of the first two batches of names approved by the WGSN; which included Tania Australis for this star.

In Chinese, 三台 (Sān Tái), 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 中台二 (Zhōng Tái èr, English: Star of Second Middle Step).[19]

References

  1. ^ a b c d e van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600 Note: see VizieR catalogue I/311.
  2. ^ a b c d Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
  3. ^ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  4. ^ a b 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.
  5. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ a b c d e f g Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
  7. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  8. ^ Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal, 146 (4): 73, arXiv:1307.0592, Bibcode:2013AJ....146...73P, doi:10.1088/0004-6256/146/4/73, S2CID 119187733.
  9. ^ a b Ren, Shulin; Fu, Yanning (2013). "Hipparcos Photocentric Orbits of 72 Single-lined Spectroscopic Binaries". The Astronomical Journal. 145 (3): 81. Bibcode:2013AJ....145...81R. doi:10.1088/0004-6256/145/3/81. S2CID 120199240.
  10. ^ a b c d Jorissen, A.; et al. (May 2009), "Spectroscopic binaries among Hipparcos M giants. III. The eccentricity - period diagram and mass-transfer signatures", Astronomy and Astrophysics, 498 (2): 489–500, arXiv:0901.0938, Bibcode:2009A&A...498..489J, doi:10.1051/0004-6361/200810703, S2CID 2754939
  11. ^ Mallik, Sushma V. (October 1998), "Chromospheric activity in cool stars and the lithium abundance", Astronomy and Astrophysics, 338: 623–636, Bibcode:1998A&A...338..623M
  12. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  13. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  14. ^ , 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
  15. ^ Richard Hinckley Allen. "Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear". Retrieved 2016-08-26.
  16. ^ Piazzi, G. (1814), The Palermo Catalogue, Palermo
  17. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  18. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  19. ^ "(Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日" (in Chinese). Retrieved 2016-08-26.

March 11, 2023
ursae, majoris, ursae, majoris, abbreviated, formally, named, tania, australis, ɔː, binary, star, constellation, ursa, major, apparent, visual, magnitude, places, among, brighter, members, constellation, parallax, measurements, give, estimated, distance, rough. Mu Ursae Majoris m Ursae Majoris abbreviated Mu UMa m UMa formally named Tania Australis ˈ t eɪ n i e ɔː ˈ s t r eɪ l ɪ s 12 13 is a binary star in the constellation of Ursa Major An apparent visual magnitude of 3 06 2 places it among the brighter members of the constellation Parallax measurements give an estimated distance of roughly 230 light years 71 parsecs from the Sun with a margin of error of 4 1 Mu Ursae MajorisLocation of m Ursae Majoris circled Observation dataEpoch J2000 Equinox J2000Constellation Ursa MajorRight ascension 10h 22m 19 73976s 1 Declination 41 29 58 2691 1 Apparent magnitude V 3 06 2 CharacteristicsEvolutionary stage asymptotic giant branch 3 Spectral type M0 IIIab 2 U B color index 1 90 4 B V color index 1 59 4 Variable type suspected 5 AstrometryRadial velocity Rv 21 30 1 66 6 km sProper motion m RA 81 47 1 mas yr Dec 35 34 1 mas yrParallax p 17 7987 0 3933 mas 7 Distance183 4 ly 56 1 pc Absolute magnitude MV 1 11 0 083 8 Orbit 9 Period P 230 089 daysSemi major axis a 0028 Eccentricity e 0 061Inclination i 13 6 Periastron epoch T 2425577 030 JDArgument of periastron w secondary 236 4 Semi amplitude K1 primary 7 40 km sDetailsRadius75 10 R Luminosity977 10 1 200 6 L Surface gravity log g 1 0 6 cgsTemperature3 899 6 KMetallicity Fe H 0 00 11 dexRotational velocity v sin i 7 5 6 km sOther designationsTania Australis Alkafzah al Thaniyah m Ursae Majoris m UMa Mu UMa 34 Ursae Majoris BD 42 2115 FK5 386 GC 14232 HD 89758 HIP 50801 HR 4069 PPM 51850 SAO 43310Database referencesSIMBADdataStellar system EditMu 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 10 times the radius of the Sun 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 99m to 3 33m 5 This is a spectroscopic binary star system with a companion a mere 0 2 AU from the primary assuming a distance of 71 parsecs with an orbital period of 230 days 9 Nomenclature Editm Ursae Majoris Latinised to Mu Ursae Majoris is the star s Bayer designation It bore the traditional names Tania shared with Lambda Ursae Majoris and Tania Australis Tania comes from the Arabic phrase Al Fiḳrah al Thania the Second Spring of the Gazelle 15 and Australis originally australis 16 is Latin for the south side In 2016 the International Astronomical Union organized a Working Group on Star Names WGSN 17 to catalog and standardize proper names for stars The WGSN s first bulletin of July 2016 18 included a table of the first two batches of names approved by the WGSN which included Tania Australis for this star In Chinese 三台 San Tai 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 中台二 Zhōng Tai er English Star of Second Middle Step 19 References Edit a b c d e van Leeuwen Floor November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752v1 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 Note see VizieR catalogue I 311 a b c d Mallik Sushma V December 1999 Lithium abundance and mass Astronomy and Astrophysics 352 495 507 Bibcode 1999A amp A 352 495M Eggen Olin J July 1992 Asymptotic giant branch stars near the sun Astronomical Journal 104 1 275 313 Bibcode 1992AJ 104 275E doi 10 1086 116239 a b 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 Samus N N Durlevich O V et al 2009 VizieR Online Data Catalog General Catalogue of Variable Stars Samus 2007 2013 VizieR On line Data Catalog B GCVS Originally Published in 2009yCat 102025S 1 Bibcode 2009yCat 102025S a b c d e f g Massarotti Alessandro et al January 2008 Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity The Astronomical Journal 135 1 209 231 Bibcode 2008AJ 135 209M doi 10 1088 0004 6256 135 1 209 Brown A G A et al Gaia collaboration 2021 Gaia Early Data Release 3 Summary of the contents and survey properties Astronomy amp Astrophysics 649 A1 arXiv 2012 01533 Bibcode 2021A amp A 649A 1G doi 10 1051 0004 6361 202039657 S2CID 227254300 Erratum doi 10 1051 0004 6361 202039657e Gaia EDR3 record for this source at VizieR Park Sunkyung et al 2013 Wilson Bappu Effect Extended to Surface Gravity The Astronomical Journal 146 4 73 arXiv 1307 0592 Bibcode 2013AJ 146 73P doi 10 1088 0004 6256 146 4 73 S2CID 119187733 a b Ren Shulin Fu Yanning 2013 Hipparcos Photocentric Orbits of 72 Single lined Spectroscopic Binaries The Astronomical Journal 145 3 81 Bibcode 2013AJ 145 81R doi 10 1088 0004 6256 145 3 81 S2CID 120199240 a b c d Jorissen A et al May 2009 Spectroscopic binaries among Hipparcos M giants III The eccentricity period diagram and mass transfer signatures Astronomy and Astrophysics 498 2 489 500 arXiv 0901 0938 Bibcode 2009A amp A 498 489J doi 10 1051 0004 6361 200810703 S2CID 2754939 Mallik Sushma V October 1998 Chromospheric activity in cool stars and the lithium abundance Astronomy and Astrophysics 338 623 636 Bibcode 1998A amp A 338 623M Kunitzsch Paul Smart Tim 2006 A Dictionary of Modern star Names A Short Guide to 254 Star Names and Their Derivations 2nd rev ed Cambridge Massachusetts Sky Pub ISBN 978 1 931559 44 7 IAU Catalog of Star Names Retrieved 28 July 2016 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 Richard Hinckley Allen Star Names Their Lore and Meaning Ursa Major the Greater Bear Retrieved 2016 08 26 Piazzi G 1814 The Palermo Catalogue Palermo IAU Working Group on Star Names WGSN Retrieved 22 May 2016 Bulletin of the IAU Working Group on Star Names No 1 PDF Retrieved 28 July 2016 Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 6 月 21 日 in Chinese Retrieved 2016 08 26 Retrieved from https en wikipedia org w index php title Mu Ursae Majoris amp oldid 1141473620, wikipedia, wiki, book, books, library,

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