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Delta Sagittarii

January 01, 1970

Delta Sagittarii (δ Sagittarii, abbreviated Delta Sgr, δ Sgr), formally named Kaus Media /ˌkɔːs ˈmiːdiə/,[10][11] is a star in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of this star is +2.70,[2] making it easily visible to the naked eye. Parallax measurements place the distance at roughly 348 light-years (107 parsecs) from the Sun.[1]

Delta Sagittarii
Location of δ Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 18h 20m 59.64354s[1]
Declination −29° 49′ 41.1659″[1]
Apparent magnitude (V) +2.70[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.55[2]
B−V color index +1.38[2]
Astrometry
Radial velocity (Rv)–19.9[4] km/s
Proper motion (μ) RA: +32.54[1] mas/yr
Dec.: −25.57[1] mas/yr
Parallax (π)9.38 ± 0.18 mas[1]
Distance348 ± 7 ly
(107 ± 2 pc)
Absolute magnitude (MV)−1.99[5]
Details
δ Sgr A
Mass3.21[6] M☉
Radius76.84[6][a] R☉
Luminosity1,660[6] L☉
Surface gravity (log g)0.30[7] cgs
Temperature4,203±69[6] K
Metallicity [Fe/H]−0.32[7] dex
Rotational velocity (v sin i)3.6[8] km/s
Age260[6] Myr
Other designations
Kaus Media, Kaus Meridionalis, Media, δ Sgr, CPD−30°5513, FK5 687, GC 25024, HD 168454, HIP 89931, HR 6859, SAO 186681, PPM 268275, CCDM J18210-2950A, WDS J18210-2950A[9]
Database references
SIMBADDelta Sagittarii

Properties edit

Eggleton and Tokovinin (2008) list Delta Sagittarii as a binary star system consisting of an evolved K-type giant star with a stellar classification of K3 III,[3] and a white dwarf companion.[12] The giant is a weak barium star, most likely having had its surface abundance of s-process elements enhanced through mass transfer from an orbiting companion, presumed to be a white dwarf.[13] It has an estimated 3.21 times the mass of the Sun and is about 260 million years old.[6]

Delta Sagittarii has three dim visual companions:[14]

  • a 14th magnitude star at a separation of 26 arcseconds,
  • a 15th magnitude star at a separation of 40 arcseconds, and
  • a 13th magnitude star at a separation of 58 arcseconds from the primary.

Nomenclature edit

δ Sagittarii (Latinised to Delta Sagittarii) is the star's Bayer designation.

It bore the traditional names Kaus Media, Kaus Meridionalis, and Media, which derive from the Arabic: قوس qaws ('bow') and Latin: media ('middle'). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[16] included a table of the first two batches of names approved by the WGSN; which included Kaus Media for this star.

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Thani al Waridah, meaning 'second of Warida'.[17]

In Chinese astronomy, 箕 Jī ('Winnowing Basket') refers to an asterism consisting of Delta Sagittarii, Gamma2 Sagittarii, Epsilon Sagittarii and Eta Sagittarii. Consequently, the Chinese name for Delta Sagittarii itself is 箕宿二 Jī Sù èr ('the Second Star of Winnowing Basket').[18]

This star, together with Gamma Sagittarii, Epsilon Sagittarii, Zeta Sagittarii, Lambda Sagittarii, Sigma Sagittarii, Tau Sagittarii and Phi Sagittarii, comprises the Teapot asterism.[19]

In Hindu astrology, this star is also called Purvashada Nakshatra.

References edit

  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.
  2. ^ a b c d Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (1): 99–110. Bibcode:1966CoLPL...4...99J.
  3. ^ a b Houk, Nancy (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars: Declinations -40_ƒ0 to -26_ƒ0. Astronomy. Vol. 3. Ann Arbor, MI: University of Michigan. Bibcode:1982mcts.book.....H.
  4. ^ Evans, D. S. (1967). Written at University of Toronto. Batten, Alan Henry; Heard, John Frederick (eds.). The Revision of the General Catalogue of Radial Velocities: Determination of Radial Velocities and their Applications. International Astronomical Union Symposium no. 30. Vol. 30. London: Academic Press. p. 57. Bibcode:1967IAUS...30...57E.
  5. ^ Elgarøy, Øystein; Engvold, Oddbjørn; Lund, Niels (March 1999). "The Wilson-Bappu effect of the MgII K line – dependence on stellar temperature, activity and metallicity". Astronomy and Astrophysics. 343: 222–228. Bibcode:1999A&A...343..222E.
  6. ^ a b c d e f Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88.
  7. ^ a b Luck, R. Earle; Challener, Sharon L. (December 1995). "Chemical Abundances for Very Strong-Lined Giants". The Astronomical Journal. 110 (6): 2968–3009. Bibcode:1995AJ....110.2968L. doi:10.1086/117741.
  8. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  9. ^ "del Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-01-11.
  10. ^ Kunitzsch, P.; Smart, T. (2006). A Dictionary of Modern Star Names: A short guide to 254 star names and their derivations (2nd revised ed.). Sky Publishing. p. 22. ISBN 1-931559-44-9.
  11. ^ "IAU Catalog of Star Names" (TXT). from the original on 2016-08-12. Retrieved 28 July 2016.
  12. ^ 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.
  13. ^ Gomez, A. E.; Luri, X.; Grenier, S.; Prevot, L.; Mennessier, M. O.; Figueras, F.; Torra, J. (March 1997). "Absolute magnitudes and kinematics of barium stars". Astronomy and Astrophysics. 319: 881–885. Bibcode:1997A&A...319..881G.
  14. ^ Dommanget, J.; Nys, O. (1994). "Catalogue des composantes d'etoiles doubles et multiples (CCDM) premiere edition – Catalogue of the components of double and multiple stars (CCDM)". Communications de l'Observatoire Royal de Belgique. 115 (First ed.). Observatoire Royal de Belgique: 1. Bibcode:1994CoORB.115....1D.
  15. ^ "Division C WG Star Names". International Astronomical Union. from the original on 2016-06-10. Retrieved 22 May 2016.
  16. ^ "Bulletin of the IAU Working Group on Star Names" (PDF). July 2016. (PDF) from the original on 2016-09-09. Retrieved 28 July 2016.
  17. ^ Knobel, E. B. (June 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society. 55 (8): 435. Bibcode:1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429.
  18. ^ 陳輝樺 (11 May 2006). "中國古代的星象系統 (11): 箕宿". AEEA 天文教育資訊網 [AEEA (Activities of Exhibition and Education in Astronomy)] (in Chinese). National Museum of Natural Science. from the original on 2020-10-03.
  19. ^ "Teapot". Constellation Guide. 25 August 2015. from the original on 2020-07-26. Retrieved 2017-05-13.
  1. ^ Radius calculated with temperature and luminosity

External links edit

  • Kaus Media information on Stars site

January 01, 1970
delta, sagittarii, sagittarii, abbreviated, delta, formally, named, kaus, media, ɔː, star, southern, zodiac, constellation, sagittarius, apparent, visual, magnitude, this, star, making, easily, visible, naked, parallax, measurements, place, distance, roughly, . Delta Sagittarii d Sagittarii abbreviated Delta Sgr d Sgr formally named Kaus Media ˌ k ɔː s ˈ m iː d i e 10 11 is a star in the southern zodiac constellation of Sagittarius The apparent visual magnitude of this star is 2 70 2 making it easily visible to the naked eye Parallax measurements place the distance at roughly 348 light years 107 parsecs from the Sun 1 Delta SagittariiLocation of d Sagittarii circled Observation dataEpoch J2000 0 Equinox J2000 0 Constellation Sagittarius Right ascension 18h 20m 59 64354s 1 Declination 29 49 41 1659 1 Apparent magnitude V 2 70 2 Characteristics Spectral type K3 III 3 U B color index 1 55 2 B V color index 1 38 2 AstrometryRadial velocity Rv 19 9 4 km sProper motion m RA 32 54 1 mas yr Dec 25 57 1 mas yrParallax p 9 38 0 18 mas 1 Distance348 7 ly 107 2 pc Absolute magnitude MV 1 99 5 Detailsd Sgr AMass3 21 6 M Radius76 84 6 a R Luminosity1 660 6 L Surface gravity log g 0 30 7 cgsTemperature4 203 69 6 KMetallicity Fe H 0 32 7 dexRotational velocity v sin i 3 6 8 km sAge260 6 Myr Other designationsKaus Media Kaus Meridionalis Media d Sgr CPD 30 5513 FK5 687 GC 25024 HD 168454 HIP 89931 HR 6859 SAO 186681 PPM 268275 CCDM J18210 2950A WDS J18210 2950A 9 Database referencesSIMBADDelta Sagittarii Contents 1 Properties 2 Nomenclature 3 References 4 External linksProperties editEggleton and Tokovinin 2008 list Delta Sagittarii as a binary star system consisting of an evolved K type giant star with a stellar classification of K3 III 3 and a white dwarf companion 12 The giant is a weak barium star most likely having had its surface abundance of s process elements enhanced through mass transfer from an orbiting companion presumed to be a white dwarf 13 It has an estimated 3 21 times the mass of the Sun and is about 260 million years old 6 Delta Sagittarii has three dim visual companions 14 a 14th magnitude star at a separation of 26 arcseconds a 15th magnitude star at a separation of 40 arcseconds and a 13th magnitude star at a separation of 58 arcseconds from the primary Nomenclature editd Sagittarii Latinised to Delta Sagittarii is the star s Bayer designation It bore the traditional names Kaus Media Kaus Meridionalis and Media which derive from the Arabic قوس qaws bow and Latin media middle In 2016 the International Astronomical Union organized a Working Group on Star Names WGSN 15 to catalog and standardize proper names for stars The WGSN s first bulletin of July 2016 16 included a table of the first two batches of names approved by the WGSN which included Kaus Media for this star In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket this star was designated Thani al Waridah meaning second of Warida 17 In Chinese astronomy 箕 Ji Winnowing Basket refers to an asterism consisting of Delta Sagittarii Gamma2 Sagittarii Epsilon Sagittarii and Eta Sagittarii Consequently the Chinese name for Delta Sagittarii itself is 箕宿二 Ji Su er the Second Star of Winnowing Basket 18 This star together with Gamma Sagittarii Epsilon Sagittarii Zeta Sagittarii Lambda Sagittarii Sigma Sagittarii Tau Sagittarii and Phi Sagittarii comprises the Teapot asterism 19 In Hindu astrology this star is also called Purvashada Nakshatra 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 a b c d Johnson H L Iriarte B Mitchell R I Wisniewskj W Z 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 1 99 110 Bibcode 1966CoLPL 4 99J a b Houk Nancy 1982 Michigan Catalogue of Two dimensional Spectral Types for the HD stars Declinations 40 ƒ0 to 26 ƒ0 Astronomy Vol 3 Ann Arbor MI University of Michigan Bibcode 1982mcts book H Evans D S 1967 Written at University of Toronto Batten Alan Henry Heard John Frederick eds The Revision of the General Catalogue of Radial Velocities Determination of Radial Velocities and their Applications International Astronomical Union Symposium no 30 Vol 30 London Academic Press p 57 Bibcode 1967IAUS 30 57E Elgaroy Oystein Engvold Oddbjorn Lund Niels March 1999 The Wilson Bappu effect of the MgII K line dependence on stellar temperature activity and metallicity Astronomy and Astrophysics 343 222 228 Bibcode 1999A amp A 343 222E a b c d e f Luck R Earle 25 August 2015 Abundances in the Local Region I G and K Giants The Astronomical Journal 150 3 88 arXiv 1507 01466 Bibcode 2015AJ 150 88L doi 10 1088 0004 6256 150 3 88 a b Luck R Earle Challener Sharon L December 1995 Chemical Abundances for Very Strong Lined Giants The Astronomical Journal 110 6 2968 3009 Bibcode 1995AJ 110 2968L doi 10 1086 117741 De Medeiros J R Alves S Udry S Andersen J Nordstrom B Mayor M January 2014 A catalog of rotational and radial velocities for evolved stars V Southern stars Astronomy amp Astrophysics 561 A126 arXiv 1312 3474 Bibcode 2014A amp A 561A 126D doi 10 1051 0004 6361 201220762 ISSN 0004 6361 del Sgr SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2012 01 11 Kunitzsch P Smart T 2006 A Dictionary of Modern Star Names A short guide to 254 star names and their derivations 2nd revised ed Sky Publishing p 22 ISBN 1 931559 44 9 IAU Catalog of Star Names TXT Archived from the original on 2016 08 12 Retrieved 28 July 2016 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 Gomez A E Luri X Grenier S Prevot L Mennessier M O Figueras F Torra J March 1997 Absolute magnitudes and kinematics of barium stars Astronomy and Astrophysics 319 881 885 Bibcode 1997A amp A 319 881G Dommanget J Nys O 1994 Catalogue des composantes d etoiles doubles et multiples CCDM premiere edition Catalogue of the components of double and multiple stars CCDM Communications de l Observatoire Royal de Belgique 115 First ed Observatoire Royal de Belgique 1 Bibcode 1994CoORB 115 1D Division C WG Star Names International Astronomical Union Archived from the original on 2016 06 10 Retrieved 22 May 2016 Bulletin of the IAU Working Group on Star Names PDF July 2016 Archived PDF from the original on 2016 09 09 Retrieved 28 July 2016 Knobel E B June 1895 Al Achsasi Al Mouakket on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket Monthly Notices of the Royal Astronomical Society 55 8 435 Bibcode 1895MNRAS 55 429K doi 10 1093 mnras 55 8 429 陳輝樺 11 May 2006 中國古代的星象系統 11 箕宿 AEEA 天文教育資訊網 AEEA Activities of Exhibition and Education in Astronomy in Chinese National Museum of Natural Science Archived from the original on 2020 10 03 Teapot Constellation Guide 25 August 2015 Archived from the original on 2020 07 26 Retrieved 2017 05 13 Radius calculated with temperature and luminosityExternal links editKaus Media information on Stars site Retrieved from https en wikipedia org w index php title Delta Sagittarii amp oldid 1217412377, wikipedia, wiki, book, books, library,

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