43 Sagittarii

43 Sagittarii
Observationsdata
Epok: J2000.0
StjärnbildSkytten
Rektascension19t 17m 38,07906s[1]
Deklination-18° 57′ 10,4626″[1]
Skenbar magnitud ()+4,88[2]
Stjärntyp
SpektraltypG8 II-III[3]
U–B+0,81[4]
B–V+1,02[4]
Astrometri
Radialhastighet ()+15,20[5] km/s
Egenrörelse (µ)RA: -10,341[1] mas/år
Dek.: -10,892[1] mas/år
Parallax ()6,9681 ± 0,1875[1]
Avstånd470 ± 10  (144 ± 4 pc)
Absolut magnitud ()-0,96[2]
Detaljer
Massa3,30[6] M
Radie23,99[6] R
Luminositet277[6] L
Temperatur4 813[6] K
Metallicitet-0,18[6]dex
Vinkelhastighet4,2[7] km/s
Ålder350 ± 100[8] miljoner år
Andra beteckningar
BD-19 5379, FK5 722, GSC 06304-00334, HD 180540, HIC 94820, HIP 94820, HR 7304, IRAS 19147-1902, IRC -20550, 2MASS J19173809-1857104, PLX 4490, PPM 235771, SAO 162413, TYC 6304-334-1, uvby98 100180540, Gaia DR2 4084276442652198400 [9]

43 Sagittarii, som är stjärnans Flamsteed-beteckning, är en ensam stjärna,[10] belägen i den norra delen av stjärnbilden Skytten och har även Bayer-beteckningen d Sagittarii. Den har en skenbar magnitud på 4,88[2] och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 7,0[1] mas, beräknas den befinna sig på ett avstånd på ca 470 ljusår (ca 144 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 15 km/s.[5] Stjärnans position nära ekliptikan innebär att den är föremål för ockultationer med månen.[11]

Egenskaper

43 Sagittarii är en gul till vit ljusstark jättestjärna av spektralklass G8 II-III,[3] som med 97 procent sannolikhet befinner sig på den horisontella jättegrenen[8] och har förbrukat förrådet av väte i dess kärna och genererar energi genom termonukleär fusion av helium. Den har en massa som är ca 3,3[6] solmassor, en radie som är ca 24[6] solradier och utsänder från dess fotosfär ca 277[6] gånger mera energi än solen vid en effektiv temperatur av ca 4 800[6] K.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 43 Sagittarii, 18 februari 2020.

Noter

  1. ^ [a b c d e f] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ [a b c] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. ^ [a b] Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H (5th Revised ed.). 5050. Bibcode:1995yCat.5050....0H.
  4. ^ [a b] Mermilliod, J. C. (2006). "Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  5. ^ [a b] Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. ^ [a b c d e f g h i] Reffert, Sabine; et al. (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. Vizier catalog entry
  7. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  8. ^ [a b] Stock, Stephan; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv:1805.04094, Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, A33.
  9. ^ "d Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-02-18.
  10. ^ 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.
  11. ^ Richichi, A.; et al. (May 1996). "New binary stars discovered by lunar occultations. II". Astronomy and Astrophysics. 309: 163–170. Bibcode:1996A&A...309..163R.

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