1 Cassiopeiae

1 Cassiopeiae
Données d'observation
(époque J2000.0)
Ascension droite 23h 06m 36,818s[1]
Déclinaison +59° 25′ 11,14″[1]
Constellation Cassiopée
Magnitude apparente 4,85[2]

Localisation dans la constellation : Cassiopée

(Voir situation dans la constellation : Cassiopée)
Caractéristiques
Type spectral B0,5 III[3]
Indice U-B −0,87[2]
Indice B-V −0,03[2]
Indice R-I −0,11[2]
Astrométrie
Vitesse radiale −9,1 ± 0,9 km/s[4]
Mouvement propre μα = +6,94 mas/a[1]
μδ = −1,95 mas/a[1]
Parallaxe 2,89 ± 0,13 mas[1]
Distance 1 130 ± 50 al
(350 ± 20 pc)
Magnitude absolue −2,91[4]
Caractéristiques physiques
Masse 13,1 M[5]
Rayon 10,2 R[6]
Gravité de surface (log g) 3,98[5]
Luminosité 18 200 L[5]
Température 27 200 K[5]
Métallicité [Fe/H] = −0,40[7]
Rotation 31 km/s[8]
Âge 5,7 ± 0,1 × 106 a[9]

Désignations

1 Cas, HR 8797, HD 218376, HIP 114104, BD+58°2545, SAO 35147[10]

1 Cassiopeiae (en abrégé 1 Cas) est une étoile de la constellation boréale de Cassiopée. Elle est visible à l'œil nu avec une magnitude apparente de 4,85[2]. D'après la mesure de sa parallaxe annuelle par le satellite Hipparcos, l'étoile est distante d'environ 350 pc (∼1 140 al) de la Terre[1]. Elle se rapproche du Système solaire à une vitesse radiale héliocentrique de −9 km/s[4].

1 Cassiopeiae est classée comme une géante bleue de type spectral B0,5 III[3], qui est âgée de 5,7 millions d'années[9]. Elle tourne sur elle-même à une vitesse de rotation projetée de 31 km/s[8]. Cette étoile est 13,1 fois plus massive que le Soleil[5] et son rayon est 10,2 fois plus grand que le rayon solaire[6]. Elle est 18 200 fois plus lumineuse que le Soleil et sa température de surface est de 27 200 K[5].

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, lire en ligne)
  2. a b c d et e (en) D. Hoffleit et W. H. Warren, « Bright Star Catalogue, 5e éd. », Catalogue de données en ligne VizieR : V/50. Publié à l'origine dans : 1964BS....C......0H, vol. 5050,‎ (Bibcode 1995yCat.5050....0H)
  3. a et b (en) J. Zorec et al., « Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ1, D) parameters into Teff », Astronomy & Astrophysics, vol. 501, no 1,‎ , p. 297–320 (DOI 10.1051/0004-6361/200811147, Bibcode 2009A&A...501..297Z, arXiv 0903.5134)
  4. a b et c (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)
  5. a b c d e et f (en) E. L. Fitzpatrick et D. Massa, « Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry », The Astronomical Journal, vol. 129, no 3,‎ , p. 1642–1662 (DOI 10.1086/427855, Bibcode 2005AJ....129.1642F, arXiv astro-ph/0412542)
  6. a et b (en) A. B. Underhill et al., « Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars », Monthly Notices of the Royal Astronomical Society, vol. 189, no 3,‎ , p. 601–605 (DOI 10.1093/mnras/189.3.601, Bibcode 1979MNRAS.189..601U)
  7. (en) Douglas R. Gies et David L. Lambert, « Carbon, nitrogen, and oxygen abundances in early B-type stars », The Astrophysical Journal, Part 1, vol. 387,‎ , p. 673–700 (DOI 10.1086/171116, Bibcode 1992ApJ...387..673G)
  8. a et b (en) S. Simón-Díaz et al., « The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars », Astronomy & Astrophysics, vol. 597,‎ , p. 17, article no A22 (DOI 10.1051/0004-6361/201628541, Bibcode 2017A&A...597A..22S, arXiv 1608.05508)
  9. a et b (en) N. Tetzlaff, R. Neuhäuser et M. M. Hohle, « A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun », Monthly Notices of the Royal Astronomical Society, vol. 410, no 1,‎ , p. 190–200 (DOI 10.1111/j.1365-2966.2010.17434.x, Bibcode 2011MNRAS.410..190T, arXiv 1007.4883)
  10. (en) * 1 Cas -- Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.

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