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Nu Ursae Majoris

March 11, 2023

Nu Ursae Majoris (ν Ursae Majoris, abbreviated Nu UMa, ν UMa), formally named Alula Borealis /əˈluːlə bɒriˈælɪs/,[8][9] is a double star in the northern circumpolar constellation of Ursa Major. At an apparent visual magnitude of +3.490,[2] it is bright enough to be seen with the naked eye. Based upon parallax measurements, the distance to ν Ursae Majoris is about 399 light-years (122 parsecs).[1]

Nu Ursae Majoris

Location of ν Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Major
Right ascension 11h 18m 28.73664s[1]
Declination +33° 05′ 39.5107″[1]
Apparent magnitude (V) +3.490[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.550[2]
B−V color index +1.400[2]
Astrometry
Radial velocity (Rv)-9.63 ± 0.38[4] km/s
Proper motion (μ) RA: –26.84[1] mas/yr
Dec.: +28.69[1] mas/yr
Parallax (π)8.17 ± 0.17 mas[1]
Distance399 ± 8 ly
(122 ± 3 pc)
Absolute magnitude (MV)−2.47 ± 0.16[5]
Details
Radius57.07 ± 4.13[5] R☉
Luminosity775 ± 122[5] L☉
Surface gravity (log g)1.89[5] cgs
Temperature4,070[5] K
Metallicity [Fe/H]–0.04[5] dex
Rotational velocity (v sin i)10[6] km/s
Other designations
Alula Borealis, ν Ursae Majoris, ν UMa, Nu UMa, 54 Ursae Majoris, BD+33 2098, CCDM J11185+3306A, FK5 425, GC 15547, HD 98262, HIP 55219, HR 4377, IDS 11131+3338 A, PPM 75790, SAO 62486, WDS J11185+3306A [7]
Database references
SIMBADdata

This is a giant star with a stellar classification of K3 III.[3] It has expanded to about 57 times the radius of the Sun and is radiating 775 times the Sun's luminosity.[5] The effective temperature of the outer envelope is 4,070 K;[5] cool enough to give it an orange hue typical of a K-type star.[10] It has a 10th-magnitude optical companion at an angular separation of 7.1 arcseconds.

Nomenclature

ν Ursae Majoris (Latinised to Nu Ursae Majoris) is the star's Bayer designation.

It also bore the traditional name of Alula Borealis.[11] Alula (shared with Xi Ursae Majoris) comes from the Arabic phrase Al Ḳafzah al Ūla 'the First Spring'.[12] and Borealis is Latin for 'northern'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[14] included a table of the first two batches of names approved by the WGSN; which included Alula Borealis for this star.

In Chinese, 三台 (Sān Tái), meaning Three Steps, refers to an asterism consisting of Nu Ursae Majoris, Iota Ursae Majoris, Kappa Ursae Majoris, Lambda Ursae Majoris, Mu Ursae Majoris, and Xi Ursae Majoris. Consequently, the Chinese name for Nu Ursae Majoris itself is 下台一 (Xià Tái yī, English: Star of First Lower Step).[15]

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 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667
  3. ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29–50, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333
  4. ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304
  5. ^ a b c d e f g h Piau, L.; et al. (February 2011), "Surface convection and red-giant radius measurements", Astronomy and Astrophysics, 526: A100, arXiv:1010.3649, Bibcode:2011A&A...526A.100P, doi:10.1051/0004-6361/201014442, S2CID 118533297
  6. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B
  7. ^ "54 UMa -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-11
  8. ^ 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.
  9. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  10. ^ , Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on December 3, 2013, retrieved 2012-01-16
  11. ^ Piazzi, G., The Palermo Catalogue, Palermo, 1814.
  12. ^ Richard Hinckley Allen :Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear
  13. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  14. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  15. ^ (in Chinese) (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日

March 11, 2023
ursae, majoris, ursae, majoris, abbreviated, formally, named, alula, borealis, double, star, northern, circumpolar, constellation, ursa, major, apparent, visual, magnitude, bright, enough, seen, with, naked, based, upon, parallax, measurements, distance, ursae. Nu Ursae Majoris n Ursae Majoris abbreviated Nu UMa n UMa formally named Alula Borealis e ˈ l uː l e b ɒ r i ˈ ae l ɪ s 8 9 is a double star in the northern circumpolar constellation of Ursa Major At an apparent visual magnitude of 3 490 2 it is bright enough to be seen with the naked eye Based upon parallax measurements the distance to n Ursae Majoris is about 399 light years 122 parsecs 1 Nu Ursae MajorisLocation of n Ursae Majoris circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Ursa MajorRight ascension 11h 18m 28 73664s 1 Declination 33 05 39 5107 1 Apparent magnitude V 3 490 2 CharacteristicsSpectral type K3 III 3 U B color index 1 550 2 B V color index 1 400 2 AstrometryRadial velocity Rv 9 63 0 38 4 km sProper motion m RA 26 84 1 mas yr Dec 28 69 1 mas yrParallax p 8 17 0 17 mas 1 Distance399 8 ly 122 3 pc Absolute magnitude MV 2 47 0 16 5 DetailsRadius57 07 4 13 5 R Luminosity775 122 5 L Surface gravity log g 1 89 5 cgsTemperature4 070 5 KMetallicity Fe H 0 04 5 dexRotational velocity v sin i 10 6 km sOther designationsAlula Borealis n Ursae Majoris n UMa Nu UMa 54 Ursae Majoris BD 33 2098 CCDM J11185 3306A FK5 425 GC 15547 HD 98262 HIP 55219 HR 4377 IDS 11131 3338 A PPM 75790 SAO 62486 WDS J11185 3306A 7 Database referencesSIMBADdataThis is a giant star with a stellar classification of K3 III 3 It has expanded to about 57 times the radius of the Sun and is radiating 775 times the Sun s luminosity 5 The effective temperature of the outer envelope is 4 070 K 5 cool enough to give it an orange hue typical of a K type star 10 It has a 10th magnitude optical companion at an angular separation of 7 1 arcseconds Nomenclature Editn Ursae Majoris Latinised to Nu Ursae Majoris is the star s Bayer designation It also bore the traditional name of Alula Borealis 11 Alula shared with Xi Ursae Majoris comes from the Arabic phrase Al Ḳafzah al ula the First Spring 12 and Borealis is Latin for northern In 2016 the International Astronomical Union organized a Working Group on Star Names WGSN 13 to catalog and standardize proper names for stars The WGSN s first bulletin of July 2016 14 included a table of the first two batches of names approved by the WGSN which included Alula Borealis for this star In Chinese 三台 San Tai meaning Three Steps refers to an asterism consisting of Nu Ursae Majoris Iota Ursae Majoris Kappa Ursae Majoris Lambda Ursae Majoris Mu Ursae Majoris and Xi Ursae Majoris Consequently the Chinese name for Nu Ursae Majoris itself is 下台一 Xia Tai yi English Star of First Lower Step 15 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 Jennens P A Helfer H L September 1975 A new photometric metal abundance and luminosity calibration for field G and K giants Monthly Notices of the Royal Astronomical Society 172 3 667 679 Bibcode 1975MNRAS 172 667J doi 10 1093 mnras 172 3 667 a b Morgan W W Keenan P C 1973 Spectral Classification Annual Review of Astronomy and Astrophysics 11 29 50 Bibcode 1973ARA amp A 11 29M doi 10 1146 annurev aa 11 090173 000333 Famaey B et al January 2005 Local kinematics of K and M giants from CORAVEL Hipparcos Tycho 2 data Revisiting the concept of superclusters Astronomy and Astrophysics 430 165 186 arXiv astro ph 0409579 Bibcode 2005A amp A 430 165F doi 10 1051 0004 6361 20041272 S2CID 17804304 a b c d e f g h Piau L et al February 2011 Surface convection and red giant radius measurements Astronomy and Astrophysics 526 A100 arXiv 1010 3649 Bibcode 2011A amp A 526A 100P doi 10 1051 0004 6361 201014442 S2CID 118533297 Bernacca P L Perinotto M 1970 A catalogue of stellar rotational velocities Contributi Osservatorio Astronomico di Padova in Asiago 239 1 1 Bibcode 1970CoAsi 239 1B 54 UMa Star in double system SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2012 01 11 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 December 3 2013 retrieved 2012 01 16 Piazzi G The Palermo Catalogue Palermo 1814 Richard Hinckley Allen Star Names Their Lore and Meaning Ursa Major the Greater Bear 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 in Chinese Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 6 月 21 日 Retrieved from https en wikipedia org w index php title Nu Ursae Majoris amp oldid 1142674166, wikipedia, wiki, book, books, library,

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