42 Aquilae

42 Aquilae
Observationsdata
Epok: J2000.0
StjärnbildÖrnen
Rektascension19t 37m 47,31770s[1]
Deklination-04° 38′ 51,5072″[1]
Skenbar magnitud ()5,45,[2] 5,68 (V)[3]
Stjärntyp
SpektraltypF3 IV/V[4]
B–V+0,429 ± 0,003[5]
Astrometri
Radialhastighet ()-37,6 ± 1,8[6] km/s
Egenrörelse (µ)RA: 105,381 ± 0,225[1] mas/år
Dek.: -53,557 ± 0,166[1] mas/år
Parallax ()31,1671 ± 0,1422[1]
Avstånd104,6 ± 0,5  (32,1 ± 0,1 pc)
Absolut magnitud ()2,98[7]
Detaljer
Massa1,26[8] M
Radie1,85[9] R
Luminositet5,76[2] L
Temperatur6 749 ± 80[6] K
Metallicitet0,17 (Fe/H)[6] dex
Vinkelhastighet87,0 ± 4,4[7] km/s
Ålder1,283[8] miljarder år
Andra beteckningar
HIP 96556[10], HR 7460[10], IRAS 19351-0445[10], 2MASS J19374730-0438516[10], SAO 143621[10], HD 185124[10], 1RXS J193748.2-043852[10], GC 27143[10], GCRV 12023[10], HIC 96556[10], PLX 4606[10], PLX 4606.00[10], PPM 203110[10], ROT 5868[10], TD1 25074[10], TYC 5153-2875-1[10], UBV 16648[10], uvby98 100185124[10], YZ 94 6733[10], WEB 16944[10], Gaia DR2 4209968351329169280[10], 42 Aql, Gaia DR3 4209968351329169280[10] och TIC 249864448[10][3][11]

42 Aquilae, som är stjärnans Flamsteed-beteckning, är en ensam stjärna[12] belägen i den mellersta delen av stjärnbilden Örnen. Den har en skenbar magnitud på ca 5,45[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 31,2[1] mas, beräknas den befinna sig på ett avstånd på ca 105 ljusår (ca 32 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -38 km/s[6] och beräknas ligga inom ett avstånd av 52 ljusår från solen om ca 752 000 år.[2]

Egenskaper

42 Aquilae är en gul till vit underjättestjärna av spektralklass F3 IV/V,[4] som i dess spektrum har blandade drag av underjätte och huvudseriestjärna. Den roterar relativt snabbt med en projicerad rotationshastighet av 87 km/s.[7] Den har en massa som är ca 1,3[8] solmassor, en radie som är ca 1,9[9] solradier och utsänder ca 5,8[2] gånger mera energi än solen från dess fotosfär vid en effektiv temperatur av ca 6 700 K.[6] Stjärnans koordinater anger en källa för röntgenstrålning, som med 99,3 procent sannolikhet kommer från stjärnan.[13]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 42 Aquilae, 8 februari 2021.

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.
  2. ^ [a b c d e] 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] ”Basic data: V* 42 Aql – High proper-motion Star” (på engelska). Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=42+Aql&submit=SIMBAD+search. Läst 30 juli 2019. 
  4. ^ [a b] Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  5. ^ van Leeuwen (2007). ”Hipparcos, the New Reduction” (på engelska). http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&HIP=96556. Läst 30 juli 2019. 
  6. ^ [a b c d e] Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  7. ^ [a b c] Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.
  8. ^ [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.
  9. ^ [a b] ”42 Aquilae” (på engelska). Universe Guide. https://www.universeguide.com/star/42aquilae. Läst 30 juli 2019. 
  10. ^ [a b c d e f g h i j k l m n o p q r s t u v w] SIMBAD Astronomical Database.[källa från Wikidata]
  11. ^ "42 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 31 oktober 2018.
  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.
  13. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138.

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