PZ Cassiopeiae

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PZ Cassiopeiae

PZ Cassiopeiae est l'étoile brillante située en haut et à droite de cette image infrarouge de WISE.

Données d'observation
(époque J2000.0)
Ascension droite	23^h 44^m 03,28104^s^[1]
Déclinaison	+61° 47′ 22,1823″^[1]
Constellation	Cassiopée
Magnitude apparente	8,90^[2] (8,2 - 10,2^[3])
Localisation dans la constellation : Cassiopée

Caractéristiques
Type spectral	M3I^[4]
Indice U-B	+1,32^[2]
Indice B-V	+2,58^[2]
Variabilité	SRc^[5]

Astrométrie
Vitesse radiale	−45,68 ± 0,68 km/s^[6]
Mouvement propre	μ_α = −4,15 mas/a^[1] μ_δ = −3,55 mas/a^[1]
Parallaxe	0,356 ± 0,026 mas^[7]
Distance	2 810+220 −190 pc (∼9 170 al)^[7]
Magnitude absolue	−7,89^[4]

Caractéristiques physiques
Rayon	1 190 (ou 1 940) R_☉^[4]
Gravité de surface (log g)	−0,5^[4]
Luminosité	240 000–270 000 L_☉^[7]
Température	3 600 K^[4]^,^[7]
Âge	8 – 10 × 10⁶ a^[7]

Désignations

PZ Cas, IRC +60417, HIP 117078, BD+60°2613, RAFGL 3138^[8]

PZ Cassiopeiae est une étoile supergéante rouge située dans la constellation de Cassiopée, et une étoile variable semi-régulière. Elle est une des plus grandes étoiles connues avec un rayon estimé de 1 190 (ou 1 940) R_☉ (soit 830 millions à 1,35 milliard de km). Sa distance a été estimée à environ ∼ 9 170 a.l. (∼ 2 810 pc) de la Terre^[7].

Compagnon

PZ Cas a un compagnon, une étoile de 13^e magnitude située à 12"^[9].

Références

↑ ^{a b c et d} (en) F. Van Leeuwen, « Validation of the new Hipparcos reduction », Astronomy & Astrophysics, vol. 474, n^o 2,‎ 2007, p. 653 (DOI 10.1051/0004-6361:20078357, Bibcode 2007A&A...474..653V, arXiv 0708.1752)
↑ ^{a b et c} (en) J. R. Ducati, « VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system », CDS/ADC Collection of Electronic Catalogues, vol. 2237,‎ 2002 (Bibcode 2002yCat.2237....0D)
↑ (en) L. L. Kiss, G. M. Szabó et T. R. Bedding, « Variability in red supergiant stars: Pulsations, long secondary periods and convection noise », Monthly Notices of the Royal Astronomical Society, vol. 372, n^o 4,‎ 2006, p. 1721 (DOI 10.1111/j.1365-2966.2006.10973.x, Bibcode 2006MNRAS.372.1721K, arXiv astro-ph/0608438)
↑ ^{a b c d et e} (en) E. M. Levesque, P. Massey, K. A. G. Olsen, B. Plez, E. Josselin, A. Maeder et G. Meynet, « The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not as Cool as We Thought », The Astrophysical Journal, vol. 628, n^o 2,‎ 2005, p. 973 (DOI 10.1086/430901, Bibcode 2005ApJ...628..973L, arXiv astro-ph/0504337)
↑ (en) A. M. Le Squeren, P. Sivagnanam, M. Dennefeld et P. David, « A Complete Survey of OH / Infrared Objects from the IRAS LRS Sources Within a Domain of the Color Diagram », Astronomy & Astrophysics, vol. 254,‎ 1992, p. 133 (Bibcode 1992A&A...254..133L)
↑ (en) B. Famaey, A. Jorissen, X. Luri, M. maior, S. Udry, H. Dejonghe et C. Turon, « Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters », Astronomy & Astrophysics, vol. 430,‎ 2005, p. 165 (DOI 10.1051/0004-6361:20041272, Bibcode 2005A&A...430..165F, arXiv astro-ph/0409579)
↑ ^{a b c d e et f} (en) K. Kusuno, Y. Asaki, H. Imai et T. Oyama, « Distance and Proper Motion Measurement of the Red Supergiant, PZ Cas, in Very Long Baseline Interferometry H2O Maser Astrometry », The Astrophysical Journal, vol. 774, n^o 2,‎ 2013, p. 107 (DOI 10.1088/0004-637X/774/2/107, Bibcode 2013ApJ...774..107K, arXiv 1308.3580)
↑ (en) V* PZ Cas -- Red Supergiant sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
↑ (en) Mason, Gary L. Wycoff, William I. Hartkopf, Geoffrey G. Douglass et Charles E. Worley, « The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog », The Astronomical Journal, vol. 122, n^o 6,‎ 2001, p. 3466 (DOI 10.1086/323920, Bibcode 2001AJ....122.3466M)

Lien externe

(en) PZ Cassiopeiae sur la base de données Simbad du Centre de données astronomiques de Strasbourg.

Voir aussi

TZ Cassiopeiae

v · m Étoiles de la constellation de Cassiopée
Bayer	α (Schédar) β (Caph) γ δ (Ruchbah) ε (Segin) ζ (Fulu) η (Achird) θ ι κ λ μ ν ξ ο π ρ σ τ υ¹ υ² (Castula) φ χ ψ ω
Flamsteed	1 2 4 6 (en) 9 10 12 13 16 23 31 32 35 38 40 42 (en) 43 44 47 48 (A) 49 (en) 50 51 52 53 54 55
Étoiles variables	R S T V RW RX RZ SU SX SZ TU TV TW TX TZ (en) UU UV VX WW WZ (en) XX XY YZ (21) (en) AB AO (en) AR AZ BH BM CC CE CH DL DN DO HT IV OX PV PZ V368 V373 (en) V376 V425 V465 V482 V487 V509 V526 V551 V559 V567 V592 V623 V636 V638 V639 V640 V649 V650 V664 V705 (en) V709 V723 V742 V743 V745 V746 V761 V762 V772 V773 (en) V801 V805 V819 V909 V988 V1022 V1405 (en)
HR	60 62 96 113 124 129 135 144 (en) 146 164 177 196 207 212 233 237 244 250 256 261 266 273 (en) 292 297 (en) 316 318 326 342 391 398 439 461 482 511 (V987) 561 567 579 743 (en) 747 791 839 860 922 932 8778 8803 8853 (en) 8881 8886 8894 9010 9028 9085 9094
HD	108 371 5927 7924 11755 15558 (en) 15570 15629 17156 (Nushagak) 17505 17520 219415 240210 (en) 240429 240430
Autres	3C 58 BD+60°2522 (en) 1E 2259+586 Gliese 22 (V547) Gliese 49 Gliese 82 Gliese 892 IGR J00234+6141 IGR J00291+5934 IRAS 23304+6147 (en) LkHα 198 LS I +61 303 (en) MWC 419 MWC 1080 OH 127.8+0.0 PSR B2319+60 PSR B2334+61 PSR J0146+6145 PSR J0205+6449 PSR J2301+5852 RX J0146.9+6121 2S 0114+650 Tycho G (en) 4U 0115+634 W0047+68 WR 1 (en) WR 2 WR 3 (en)
Liste d'étoiles de Cassiopée

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