Gamma Sagittae

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]

Gamma Sagittae
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    Sterrekunde

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

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. 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. 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. 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. 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. 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

• Kaler, James B. "GAMMA SGE (Gamma Sagittae)". STARS. University of Illinois. Besoek op 30 November 2017.
• Hierdie artikel is vertaal uit die Engelse Wikipedia