iBet uBet web content aggregator. Adding the entire web to your favor.
iBet uBet web content aggregator. Adding the entire web to your favor.



Link to original content: http://af.wikipedia.org/wiki/Gamma_Sagittae
Gamma Sagittae - Wikipedia Gaan na inhoud

Gamma Sagittae

in Wikipedia, die vrye ensiklopedie
Gamma Sagittae
Die ligging van Gamma Sagittae (in die rooi sirkel).
Die ligging van Gamma Sagittae (in die rooi sirkel).
Sterrebeeld Pyl
Spektraaltipe M0 III[1][2][3]
Soort Rooireus
Waarnemingsdata (Epog J2000)
Regte klimming 19h 58m 45.42863s[4]
Deklinasie +19° 29′ 31.7281″[4]
Skynmagnitude (m) 3,47[5]
Absolute magnitude (M) -1,11[6]
B-V-kleurindeks  +1,57[5]
U-B-kleurindeks  +1,93[5]
Besonderhede
Massa (M☉) 1,37[7]
Radius (R☉) 55,13±3,29[8]
Ouderdom (jaar) 2,35 miljard[2]
Temperatuur (K) 3 862±40[2]
Afstand (ligjaar) 258
Metaalinhoud [Fe/H] -0,14[8]
Ander name
12 Sagittae, BD+19° 4229 FK5 752, HD 189319, HIP 98337, HR 7635, SAO 105500, GC 27672, PPM 137344
Portaal  Portaalicoon   Sterrekunde

Gamma Sagittae (afgekort as γ Sge) is die helderste ster in die noordelike sterrebeeld Pyl (Sagitta). Dit is ’n enkelster[9] wat teen ’n skynbare magnitude van 3,47[5] met die blote oog sigbaar is. Volgens parallaksmetings is dit sowat 258 ligjare van die Son af. Dit beweeg nader aan ons teen ’n radiale snelheid van -34 km/s.[10]

Dit is ’n geëvolueerde rooireus met ’n sterreklassifikasie van M0 III.[11] Dit is sowat 2,35 miljard jaar oud,[2] en het ’n massa van sowat 1,37 keer dié van die Son[7] en ’n radius van sowat 55 keer die Son s’n.[8] Sy ligsterkte is omtrent 562 keer dié van die Son[8] en sy effektiewe temperatuur is 3 862 K.[2]

Verwysings

[wysig | wysig bron]
  1. ↑ 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.
  2. ↑ 2,0 2,1 2,2 2,3 2,4 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88.
  3. ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/mk. Oorspronklik gepubliseer in: Lowell Observatory (Oktober 2014). 1. Bibcode:2014yCat....1.2023S.
  4. ↑ 4,0 4,1 van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  5. ↑ 5,0 5,1 5,2 5,3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  6. ↑ Setiawan, J. et al. (Julie 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics 421: 241–254, doi:10.1051/0004-6361:20041042-1, Bibcode: 2004A&A...421..241S. 
  7. ↑ 7,0 7,1 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277.
  8. ↑ 8,0 8,1 8,2 8,3 Piau, L.; Kervella, P.; Dib, S.; Hauschildt, P. (2011). "Surface convection and red-giant radius measurements". Astronomy and Astrophysics. 526: 12. arXiv:1010.3649. Bibcode:2011A&A...526A.100P. doi:10.1051/0004-6361/201014442. A100.
  9. ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  10. ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  11. ↑ Wittkowski, M.; Hummel, C. A.; Aufdenberg, J. P.; Roccatagliata, V. (Desember 2006), "Tests of stellar model atmospheres by optical interferometry. III. NPOI and VINCI interferometry of the M0 giant γ Sagittae covering 0.5-2.2 μm", Astronomy and Astrophysics 460 (3): 843–853, doi:10.1051/0004-6361:20065853, Bibcode: 2006A&A...460..843W. 

Eksterne skakels

[wysig | wysig bron]
Ontsluit van "https://af.wikipedia.org/w/index.php?title=Gamma_Sagittae&oldid=2358831"