Tau Cassiopeiae

τ Cassiopeiae
Données d'observation
(époque J2000.0)
Ascension droite 23h 47m 03,45439s[1]
Déclinaison +58° 39′ 07,1677″[1]
Constellation Cassiopée
Magnitude apparente 4,87[2]

Localisation dans la constellation : Cassiopée

(Voir situation dans la constellation : Cassiopée)
Caractéristiques
Type spectral K1-IIIa[3]
Indice U-B +1,05[4]
Indice B-V +1,11[4]
Variabilité aucune[5]
Astrométrie
Vitesse radiale −20,71 ± 0,12 km/s[1]
Mouvement propre μα = +60,379 mas/a[1]
μδ = +56,828 mas/a[1]
Parallaxe 18,778 9 ± 0,080 2 mas[1]
Distance 53,251 0 ± 0,227 4 pc (∼174 al)[6]
Magnitude absolue +1,269[7]
Caractéristiques physiques
Masse 1,44 M[8]
Rayon 10 R[9]
Gravité de surface (log g) 2,50 ± 0,09[10]
Luminosité 40 L[8]
Température 4 617 ± 77 K[8]
Métallicité [Fe/H] = +0,06 ± 0,06[10]
Rotation 5,9 km/s[9]
Âge 3,90 × 109 a[8]

Désignations

τ Cas, 5 Cas, HR 9008, HD 223165, HIP 117301, BD+57°2804, FK5 3909, SAO 35763[6]

Tau Cassiopeiae (τ Cassiopeiae / τ Cas) est une étoile géante de la constellation boréale de Cassiopée. Elle est visible à l'œil nu avec une magnitude apparente de 4,87[2]. L'étoile présente une parallaxe annuelle de 18,78 mas telle que mesurée par le satellite Gaia[1], ce qui permet d'en déduire qu'elle est distante de ∼ 174 a.l. (∼ 53,3 pc) de la Terre. Elle se rapproche du Système solaire à une vitesse radiale héliocentrique de −20,7 km/s[1].

Propriétés

Tau Cassiopeiae est une étoile géante rouge de type spectral K1-IIIa[3]. Elle a été suspectée d'être une variable[11], mais la photométrie du satellite Hipparcos a montré que l'étoile est constante[5]. L'étoile est âgée de 3,9 milliards d'années[8], sa masse est 1,44 fois supérieure à celle du Soleil[8] et son rayon est dix fois plus grand que le rayon solaire[9]. Elle est 40 fois plus lumineuse que le Soleil et sa température de surface est de 4 617 K[8].

Nomenclature

τ Cassiopeiae, latinisé en Tau Cassiopeiae, est la désignation de Bayer de l'étoile. Elle porte également la désignation de Flamsteed de 5 Cassiopeiae[6].

En astronomie chinoise, Tau Cassiopeiae fait partie de l'astérisme de Tengshe (en chinois 螣蛇, Téng Shé), représentant un serpent aquatique[12].

Notes et références

  1. a b c d e f g et h (en) A. Vallenari et al. (Gaia collaboration), « Gaia Data Release 3 : Summary of the content and survey properties », Astronomy & Astrophysics, vol. 674,‎ , article no A1 (DOI 10.1051/0004-6361/202243940, Bibcode 2023A&A...674A...1G, arXiv 2208.00211). Notice Gaia DR3 pour cette source sur VizieR.
  2. a et b (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) Philip C. Keenan et Raymond C. McNeil, « The Perkins catalog of revised MK types for the cooler stars », The Astrophysical Journal Supplement Series, vol. 71,‎ , p. 245 (DOI 10.1086/191373, Bibcode 1989ApJS...71..245K)
  4. a et b (en) A. N. Argue, « UBV photometry of 550 F, G and K type stars », Monthly Notices of the Royal Astronomical Society, vol. 133, no 4,‎ , p. 475 (DOI 10.1093/mnras/133.4.475, Bibcode 1966MNRAS.133..475A)
  5. a et b « VSX : Detail for NSV 14707 », sur The International Variable Star Index, AAVSO (consulté le )
  6. a b et c (en) * tau Cas -- High Proper Motion Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  7. (en) Soubiran et al., « Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants », Astronomy & Astrophysics, vol. 480, no 1,‎ , p. 91–101 (DOI 10.1051/0004-6361:20078788, Bibcode 2008A&A...480...91S, arXiv 0712.1370)
  8. a b c d e f et g (en) R. Earle Luck, « Abundances in the Local Region. I. G and K Giants », The Astronomical Journal, vol. 150, no 3,‎ , p. 88 (DOI 10.1088/0004-6256/150/3/88, Bibcode 2015AJ....150...88L, arXiv 1507.01466)
  9. a b et c (en) Alessandro Massarotti et al., « Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity », The Astronomical Journal, vol. 135, no 1,‎ , p. 209–231 (DOI 10.1088/0004-6256/135/1/209, Bibcode 2008AJ....135..209M)
  10. a et b (en) Yue Wu et al., « Coudé-feed stellar spectral library – atmospheric parameters », Astronomy & Astrophysics, vol. 525,‎ , A71 (DOI 10.1051/0004-6361/201015014, Bibcode 2011A&A...525A..71W, arXiv 1009.1491)
  11. (en) E. M. Halbedel, « tau Cas: a Variable Star after All? », Information Bulletin on Variable Stars, no 3851,‎ , p. 1 (Bibcode 1993IBVS.3851....1H)
  12. (zh) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日

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