83 Cancri

83 Cancri
Observationsdata
Epok: J2000.0
StjärnbildKräftan
Rektascension09t 18m 58,82772s[1]
Deklination+17° 42′ 19,2744″[1]
Skenbar magnitud ()+6,61 (V)[2]
Stjärntyp
SpektraltypF4 V[2] + WD[3]
B–V+0,487 ± 0,030[2]
Variabeltypkonstant[2]
Astrometri
Radialhastighet ()-14,8 ± 0,4[2] km/s
Egenrörelse (µ)RA: -135,130[1] mas/år
Dek.: -105,267[1] mas/år
Parallax ()24,5641 ± 0,0966[1]
Avstånd132,2 ± 0,5  (40,7 ± 0,2 pc)
Absolut magnitud ()3,57[2]
Detaljer
Massa1,13[4] M
Radie1,53+0,02-0,05[1] R
Luminositet3,135 ± 0,015[1] L
Temperatur6 218+96-53[1] K
Metallicitet-0,26 ± 0,02[2]dex
Ålder3,1[4] miljarder år
Andra beteckningar
83 Cnc, AG+17 1015, BD+18 2165, FK5 350, GSC 01405-00943, HD 80218, HIC 45699, HIP 45699, LSPM J0918+1742, 2MASS J09185885+1742195, PLX 2217, PPM 126320, SAO 98488, TD1 13776, TYC 1405-943-1, USNO-B1.0 1077-00208951, uvby98 100080218, Gaia DR2 632104703618657792 [5]

83 Cancri, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna,[6] belägen i den mellersta delen av stjärnbilden Kräftan. Den har en kombinerad skenbar magnitud av ca 6,61[2] och kräver åtminstone en handkikare för att kunna observeras. Trots att den har en Flamsteed-beteckning är den för svag för att ingå i Bright Star Catalogue.[7] Baserat på parallax enligt Gaia Data Release 2 på ca 24,6[1] mas, beräknas den befinna sig på ett avstånd på ca 133 ljusår (ca 41 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -15 km/s.[2] Paret har en relativt stor egenrörelse och rör sig över himlavalvet med en vinkelhastighet av 0,185 bågsekunder per år.[8]

Egenskaper

Primärstjärnan 83 Cancri A är en gul till vit stjärna i huvudserien av spektralklass F4 V,[2] vars atmosfär anrikats med s-processelement, särskilt strontium och yttrium, som tillkommit genom massöverföring från följeslagaren under den tid den senare befann sig på den asymptotiska jättegrenen.[9] Den har en massa som är ca 1,1[4] solmassor, en radie som är ca 1,5[2] solradier och utsänder från dess fotosfär ca 3[1] gånger mera energi än solen vid en effektiv temperatur av ca 6 200[1] K.

83 Cancri är en astrometrisk dubbelstjärna[10] en omloppsperiod på ca 32 dygn och en excentricitet av ca 0,6.[3] Den osynliga följeslagaren är troligtvis en vit dvärg med hög massa och har ca 1,3 gånger solens massa.[3]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 83 Cancri, 1 april 2020.

Noter

  1. ^ [a b c d e f g h i j k] 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 d e f g h i j k] 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.
  3. ^ [a b c] Goncharov, G. A.; Kiyaeva, O. V. (April 2002), "Astrometric Orbits from a Direct Combination of Ground-Based Catalogs with the Hipparcos Catalog", Astronomy Letters, 28 (4): 261–271, Bibcode:2002AstL...28..261G, doi:10.1134/1.1467262.
  4. ^ [a b c] David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  5. ^ "83 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-04-01.
  6. ^ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, 87.
  7. ^ Bidelman, W. P. (December 1990), "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"", Bulletin d'Information du Centre de Données Stellaires, 38: 13, Bibcode:1990BICDS..38...13B.
  8. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
  9. ^ Reddy, Bacham E.; et al. (March 2003), "The chemical compositions of Galactic disc F and G dwarfs", Monthly Notices of the Royal Astronomical Society, 340 (1): 304–340, arXiv:astro-ph/0211551, Bibcode:2003MNRAS.340..304R, doi:10.1046/j.1365-8711.2003.06305.x.
  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.

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