Zeta Sagittae

ζ Sagittae
Données d'observation
(époque J2000.0)
Ascension droite 19h 48m 58,660s[1]
Déclinaison +19° 08′ 31,35″[1]
Constellation Flèche
Magnitude apparente +5,00 (5,64 + 6,04 + 9,01)[2],[3]

Localisation dans la constellation : Flèche

(Voir situation dans la constellation : Flèche)
Caractéristiques
Type spectral A3 Vnn[4] (A1 V + A3 V)[5]
Indice U-B +0,06[2]
Indice B-V +0,10[2]
Astrométrie
Vitesse radiale −16,6 ± 2,6 km/s[6]
Mouvement propre μα = +17,63 mas/a[1]
μδ = +26,27 mas/a[1]
Parallaxe 12,79 ± 0,67 mas[1]
Distance 260 ± 10 al
(78 ± 4 pc)
Magnitude absolue +0,55[7]
Caractéristiques physiques
Masse 1,80 M[8]
Rayon 1,7 R[9]
Gravité de surface (log g) 3,89[8]
Luminosité 46 L[10]
Température 8 422 ± 286 K[8]
Rotation 240 km/s[11]
Âge 347 × 106 a[8]
Composants stellaires
Composants stellaires ζ Sge A/B, ζ Sge C
Orbite
Compagnon ζ Sge B[12]
Demi-grand axe (a) 0,136 05 
Excentricité (e) 0,794 8 ± 0,001 9
Période (P) 8 487,9 ± 4,9 j
Inclinaison (i) 132,33 ± 0,41°
Argument du périastre (ω) 355,3 ± 1,0°
Longitude du nœud ascendant (Ω) 340,97 ± 0,68°
Époque du périastre (τ) 44 199,6 ± 5,9 HMJD

Désignations

ζ Sge, 8 Sge, HR 7546, HD 187362, HIP 97496, BD+18°4254, GC 27431, ADS 12973AB, WDS J19490 +1909AB[13]

Zeta Sagittae (ζ Sge) est un système d'étoiles triple[3] de la constellation boréale de la Flèche. Il est visible à l'œil nu, ayant une magnitude apparente combinée de +5,00[2]. Le système présente une parallaxe annuelle de 12,79 mas mesurée par le satellite Hipparcos[1], ce qui permet d'en déduire qu'il est situé à approximativement ∼ 260 a.l. (∼ 79,7 pc) de la Terre. Il se rapproche du Système solaire à une vitesse radiale d'environ −17 km/s[6].

Description

Le système de Zeta Sagittae est dominé par un sous-système interne qui forme une binaire visuelle dont les deux composantes, désignées Zeta Sagittae A et B, sont deux étoiles blanches de la séquence principale. Elles complètent une orbite avec une période d'environ 8 490 jours (23,2 ans), un demi-grand axe de 0,136 seconde d'arc et avec une forte excentricité de 0,79[12]. La composante primaire, Zeta Sagittae A, brille à une magnitude visuelle de 5,64[3]. C'est une étoile blanche de la séquence principale de type spectral A3 Vnn[4], avec la notation « nn » qui indique que son spectre présente des raies d'absorption très « nébuleuses » en raison de sa rotation rapide. Elle tourne en effet sur elle-même à une vitesse de rotation projetée de 240 km/s. Cela donne à l'étoile une forme aplatie avec un rayon équatorial qu'on estime être 14 % plus grand que le rayon polaire[11].

Son compagnon, Zeta Sagittae B, est une étoile de magnitude 6,04. La troisième étoile du système, Zeta Sagittae C, est une étoile de magnitude 9,01 qui est plus distante, située à une distance angulaire de 8,330 secondes d'arc des deux autres[3].

Nomenclature

ζ Sagittae, latinisé Zeta Sagittae, est la désignation de Bayer de l'étoile. Elle porte également la désignation de Flamsteed de 8 Sagittae[13].

En astronomie chinoise traditionnelle, ζ Sagittae fait partie de l'astérisme de Zuoqi (en chinois 左旗, transcrit Zuǒ Qí), soit le « Drapeau Gauche ». Il comprend, outre cette étoile, α Sagittae, β Sagittae, δ Sagittae, γ Sagittae, 13 Sagittae, 11 Sagittae, 14 Sagittae et ρ Aquilae[14].

Notes et références

  1. a b c d e et f (en) F. van Leeuwen, « Validation of the new Hipparcos reduction », Astronomy & Astrophysics, vol. 474, no 2,‎ , p. 653–664 (DOI 10.1051/0004-6361:20078357, Bibcode 2007A&A...474..653V, arXiv 0708.1752)
  2. a b c et d (en) H. L. Johnson et al., « UBVRIJKL photometry of the bright stars », Communications of the Lunar and Planetary Laboratory, vol. 4, no 99,‎ (Bibcode 1966CoLPL...4...99J)
  3. a b c et d (en) P. P. Eggleton et A. A. Tokovinin, « A catalogue of multiplicity among bright stellar systems », Monthly Notices of the Royal Astronomical Society, vol. 389, no 2,‎ , p. 869–879 (DOI 10.1111/j.1365-2966.2008.13596.x, Bibcode 2008MNRAS.389..869E, arXiv 0806.2878)
  4. a et b (en) A. Cowley et al., « A study of the bright A stars. I. A catalogue of spectral classifications », The Astronomical Journal, vol. 74,‎ , p. 375–406 (DOI 10.1086/110819, Bibcode 1969AJ.....74..375C)
  5. (en) James W. Christy et R. L., Jr. Walker, « MK Classification of 142 Visual Binaries », Publications of the Astronomical Society of the Pacific, vol. 81, no 482,‎ , p. 643 (DOI 10.1086/128831 Accès libre, Bibcode 1969PASP...81..643C)
  6. a et b (en) N. V. Kharchenko et al., « Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations », Astronomische Nachrichten, vol. 328, no 9,‎ , p. 889 (DOI 10.1002/asna.200710776, Bibcode 2007AN....328..889K, arXiv 0705.0878)
  7. (en) E. Anderson et Ch. Francis, « XHIP: An extended Hipparcos compilation », Astronomy Letters, vol. 38, no 5,‎ , p. 331 (DOI 10.1134/S1063773712050015, Bibcode 2012AstL...38..331A, arXiv 1108.4971)
  8. a b c et d (en) Trevor J. David et Lynne A. Hillenbrand, « 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, vol. 804, no 2,‎ , p. 146 (DOI 10.1088/0004-637X/804/2/146, Bibcode 2015ApJ...804..146D, arXiv 1501.03154)
  9. (en) L. E. Pasinetti Fracassini et al., « Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics », Astronomy & Astrophysics, vol. 367, no 2,‎ , p. 521–24 (DOI 10.1051/0004-6361:20000451, Bibcode 2001A&A...367..521P, arXiv astro-ph/0012289)
  10. (en) I. McDonald, A. A. Zijlstra et M. L. Boyer, « Fundamental Parameters and Infrared Excesses of Hipparcos Stars », Monthly Notices of the Royal Astronomical Society, vol. 427, no 1,‎ , p. 343–57 (DOI 10.1111/j.1365-2966.2012.21873.x, Bibcode 2012MNRAS.427..343M, arXiv 1208.2037)
  11. a et b (en) Gerard T. van Belle, « Interferometric observations of rapidly rotating stars », The Astronomy and Astrophysics Review, vol. 20, no 1,‎ , p. 51 (DOI 10.1007/s00159-012-0051-2, Bibcode 2012A&ARv..20...51V, arXiv 1204.2572)
  12. a et b (en) Matthew W. Muterspaugh et al., « The Phases Differential Astrometry Data Archive. II. Updated Binary Star Orbits and a Long Period Eclipsing Binary », The Astronomical Journal, vol. 140, no 6,‎ , p. 1623–1630 (DOI 10.1088/0004-6256/140/6/1623, Bibcode 2010AJ....140.1623M, arXiv 1010.4043)
  13. a et b (en) * zet Sge -- Double or Multiple Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  14. (zh) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日

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