fbpx
Wikipedia

Lambda Draconis

March 11, 2023

Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar (/ˈdʒɔːzɑːr/ JAW-zar),[13][14] is a solitary,[15] orange-red[16] star in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of +3.85.[2] Based upon an annual parallax shift of 9.79 mas as seen from the Earth,[1] the star is located around 333 light years from the Sun.

λ Draconis
Location of λ Draconis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Draco
Right ascension 11h 31m 24.22075s[1]
Declination +69° 19′ 51.8696″[1]
Apparent magnitude (V) +3.85[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M0III-IIIa Ca1[4]
U−B color index +1.97[2]
B−V color index +1.62[2]
Variable type slow irregular[5]
Astrometry
Radial velocity (Rv)+6.58±0.30[6] km/s
Proper motion (μ) RA: −40.97[1] mas/yr
Dec.: −19.19[1] mas/yr
Parallax (π)9.79 ± 0.15 mas[1]
Distance333 ± 5 ly
(102 ± 2 pc)
Absolute magnitude (MV)−1.14±0.033[7]
Details
Mass1.7[8] M☉
Radius71[9] R☉
Luminosity834[10] L☉
Surface gravity (log g)1.10±0.05[11] cgs
Temperature3,958[10] K
Other designations
λ Dra, 1 Draconis, BD−70° 665, FK5 433, HD 100029, HIP 56211, HR 4434, SAO 15532[12]
Database references
SIMBADdata

This is an evolved red giant star on the asymptotic giant branch[3] with a stellar classification of M0III-IIIa Ca1.[4] It is a suspected slow irregular variable with a periodicity of roughly 1,100 days.[5] The measured angular diameter, after correction for limb darkening, is 6.43±0.07 mas.[17] At the estimated distance of the star, this yields a physical size of about 53 times the radius of the Sun.[9] It has an estimated 1.7[8] times the mass of the Sun and is radiating 834 times the solar luminosity from its photosphere at an effective temperature of 3,958 K.[10]

Nomenclature

λ Draconis (Latinised to Lambda Draconis) is the star's Bayer designation.

It bore the traditional name Giausar[18] (also written as Gianfar, Giansar and Giauzar) and Juza. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[19] to catalogue and standardize proper names for stars. The WGSN approved the name Giausar for this star on February 1, 2017 and it is now so included in the List of IAU-approved Star Names.[14]

In Chinese, 紫微右垣 (Zǐ Wēi Yòu Yuán), meaning Right Wall of Purple Forbidden Enclosure, refers to an asterism consisting of Lambda Draconis, Alpha Draconis, Kappa Draconis, 24 Ursae Majoris, 43 Camelopardalis, Alpha Camelopardalis and BK Camelopardalis.[20] Consequently, the Chinese name for Lambda Draconis itself is 紫微右垣三 (Zǐ Wēi Yòu Yuán sān, English: the Third Star of Right Wall of Purple Forbidden Enclosure.),[21] representing 上輔 (Shǎngfǔ), meaning First Minister.[22] 上輔 (Shǎngfǔ) was westernized into Sang Poo or Shaou Poo by R.H. Allen.[23]

Namesakes

USS Giansar (AK-111) was a United States Navy Crater class cargo ship named after the star.

References

  1. ^ a b c d e f van Leeuwen, F. (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 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.
  3. ^ a b Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  4. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2007), Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-09-30.
  6. ^ Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698, S2CID 18739721.
  7. ^ 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.
  8. ^ a b Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics, 352: 217–227, Bibcode:1999A&A...352..217G.
  9. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  10. ^ a b c McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  11. ^ Takagi, Yuhei; et al. (June 2011), "Age Determinations of Early-M Type Pre-Main Sequence Stars Using a High-Resolution Near-Infrared Spectroscopic Method", Publications of the Astronomical Society of Japan, 63 (3): 677–684, Bibcode:2011PASJ...63..677T, doi:10.1093/pasj/63.3.677.
  12. ^ "lam Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-05-28.{{cite web}}: CS1 maint: postscript (link)
  13. ^ 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.
  14. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  15. ^ 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.
  16. ^ Moore, Patrick (2013), The Observer's Year: 366 Nights of the Universe, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 285, ISBN 978-1447136132
  17. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  18. ^ Kaler, James B., "Giausar", stars.astro.illinois.edu, retrieved 2017-05-28.
  19. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2017-03-31.
  20. ^ (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.
  21. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 2008-10-25 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  22. ^ English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name 2008-09-24 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  23. ^ Allen, Richard Hinckley (1963), Star Names — Their Lore and Meaning: Draco, the Dragon, retrieved 2017-05-28.


March 11, 2023
lambda, draconis, draconis, abbreviated, also, named, giausar, ɔː, ɑːr, solitary, orange, star, northern, circumpolar, constellation, draco, visible, naked, with, apparent, visual, magnitude, based, upon, annual, parallax, shift, seen, from, earth, star, locat. Lambda Draconis l Draconis abbreviated Lam Dra l Dra also named Giausar ˈ dʒ ɔː z ɑːr JAW zar 13 14 is a solitary 15 orange red 16 star in the northern circumpolar constellation of Draco It is visible to the naked eye with an apparent visual magnitude of 3 85 2 Based upon an annual parallax shift of 9 79 mas as seen from the Earth 1 the star is located around 333 light years from the Sun l DraconisLocation of l Draconis circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation DracoRight ascension 11h 31m 24 22075s 1 Declination 69 19 51 8696 1 Apparent magnitude V 3 85 2 CharacteristicsEvolutionary stage asymptotic giant branch 3 Spectral type M0III IIIa Ca1 4 U B color index 1 97 2 B V color index 1 62 2 Variable type slow irregular 5 AstrometryRadial velocity Rv 6 58 0 30 6 km sProper motion m RA 40 97 1 mas yr Dec 19 19 1 mas yrParallax p 9 79 0 15 mas 1 Distance333 5 ly 102 2 pc Absolute magnitude MV 1 14 0 033 7 DetailsMass1 7 8 M Radius71 9 R Luminosity834 10 L Surface gravity log g 1 10 0 05 11 cgsTemperature3 958 10 KOther designationsl Dra 1 Draconis BD 70 665 FK5 433 HD 100029 HIP 56211 HR 4434 SAO 15532 12 Database referencesSIMBADdataThis is an evolved red giant star on the asymptotic giant branch 3 with a stellar classification of M0III IIIa Ca1 4 It is a suspected slow irregular variable with a periodicity of roughly 1 100 days 5 The measured angular diameter after correction for limb darkening is 6 43 0 07 mas 17 At the estimated distance of the star this yields a physical size of about 53 times the radius of the Sun 9 It has an estimated 1 7 8 times the mass of the Sun and is radiating 834 times the solar luminosity from its photosphere at an effective temperature of 3 958 K 10 Nomenclature Editl Draconis Latinised to Lambda Draconis is the star s Bayer designation It bore the traditional name Giausar 18 also written as Gianfar Giansar and Giauzar and Juza In 2016 the International Astronomical Union organized a Working Group on Star Names WGSN 19 to catalogue and standardize proper names for stars The WGSN approved the name Giausar for this star on February 1 2017 and it is now so included in the List of IAU approved Star Names 14 In Chinese 紫微右垣 Zǐ Wei You Yuan meaning Right Wall of Purple Forbidden Enclosure refers to an asterism consisting of Lambda Draconis Alpha Draconis Kappa Draconis 24 Ursae Majoris 43 Camelopardalis Alpha Camelopardalis and BK Camelopardalis 20 Consequently the Chinese name for Lambda Draconis itself is 紫微右垣三 Zǐ Wei You Yuan san English the Third Star of Right Wall of Purple Forbidden Enclosure 21 representing 上輔 Shǎngfǔ meaning First Minister 22 上輔 Shǎngfǔ was westernized into Sang Poo or Shaou Poo by R H Allen 23 Namesakes EditUSS Giansar AK 111 was a United States Navy Crater class cargo ship named after the star References Edit a b c d e f van Leeuwen F 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 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 Eggen O J 1992 Asymptotic giant branch stars near the sun The Astronomical Journal 104 275 Bibcode 1992AJ 104 275E doi 10 1086 116239 a b Keenan Philip C McNeil Raymond C 1989 The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 71 245 Bibcode 1989ApJS 71 245K doi 10 1086 191373 a b Samus N N Durlevich O V et al 2007 Combined General Catalogue of Variable Stars GCVS4 2 retrieved 2016 09 30 Famaey B et al 2009 Spectroscopic binaries among Hipparcos M giants I Data orbits and intrinsic variations Astronomy and Astrophysics 498 2 627 640 arXiv 0901 0934 Bibcode 2009A amp A 498 627F doi 10 1051 0004 6361 200810698 S2CID 18739721 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 Gondoin P December 1999 Evolution of X ray activity and rotation on G K giants Astronomy and Astrophysics 352 217 227 Bibcode 1999A amp A 352 217G a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 102 1 6 43 10 3 AU 0 0046491 AU R 141 2 R displaystyle begin aligned 2 cdot R amp frac 102 1 cdot 6 43 cdot 10 3 text AU 0 0046491 text AU R bigodot amp approx 141 2 cdot R bigodot end aligned a b c McDonald I et al 2012 Fundamental parameters and infrared excesses of Hipparcos stars Monthly Notices of the Royal Astronomical Society 427 1 343 357 arXiv 1208 2037 Bibcode 2012MNRAS 427 343M doi 10 1111 j 1365 2966 2012 21873 x S2CID 118665352 Takagi Yuhei et al June 2011 Age Determinations of Early M Type Pre Main Sequence Stars Using a High Resolution Near Infrared Spectroscopic Method Publications of the Astronomical Society of Japan 63 3 677 684 Bibcode 2011PASJ 63 677T doi 10 1093 pasj 63 3 677 lam Dra SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 05 28 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link 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 a b Naming Stars IAU org Retrieved 16 December 2017 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 Moore Patrick 2013 The Observer s Year 366 Nights of the Universe The Patrick Moore Practical Astronomy Series Springer Science amp Business Media p 285 ISBN 978 1447136132 Richichi A et al February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 Kaler James B Giausar stars astro illinois edu retrieved 2017 05 28 International Astronomical Union IAU www iau org Retrieved 2017 03 31 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 in Chinese 香港太空館 研究資源 亮星中英對照表 Archived 2008 10 25 at the Wayback Machine Hong Kong Space Museum Accessed on line November 23 2010 English Chinese Glossary of Chinese Star Regions Asterisms and Star Name Archived 2008 09 24 at the Wayback Machine Hong Kong Space Museum Accessed on line November 23 2010 Allen Richard Hinckley 1963 Star Names Their Lore and Meaning Draco the Dragon retrieved 2017 05 28 Retrieved from https en wikipedia org w index php title Lambda Draconis amp oldid 1111543926, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.