K-type giant star in the constellation Cassiopeia
Tau Cassiopeiae (τ Cassiopeiae) is a solitary,[ 10] star in the northern constellation of Cassiopeia . It is bright enough to be seen with the naked eye, having an apparent visual magnitude of +4.86.[ 2] parallax shift of 18.75 mas as seen from Earth,[ 1] light years from the Sun .
The spectrum of this star indicates it is an evolved , K-type giant star with a stellar classification of K1 IIIa.[ 3] variable star of unknown type.[ 4] [ 11] [ 7] [ 7] mass of the Sun and 10[ 5] Sun's radius . It is radiating 40[ 7] Sun's luminosity from its expanded photosphere at an effective temperature of around 4,617 K.[ 7]
Naming
In Chinese , 螣蛇 Téng Shé Flying Serpent asterism consisting of τ Cassiopeiae, α Lacertae , 4 Lacertae , π2 Cygni , π1 Cygni , HD 206267 , ε Cephei , β Lacertae , σ Cassiopeiae , ρ Cassiopeiae , AR Cassiopeiae , 9 Lacertae , 3 Andromedae , 7 Andromedae , 8 Andromedae , λ Andromedae , κ Andromedae , ι Andromedae , and ψ Andromedae . Consequently, the Chinese name for τ Cassiopeiae itself is 螣蛇十三 Téng Shé shísān the Thirteenth Star of Flying Serpent ).[ 12]
References
^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653– 664, arXiv :0708.1752 Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 . ^ a b c d Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society , 133 (4): 475, Bibcode :1966MNRAS.133..475A , doi :10.1093/mnras/133.4.475 ^ a b 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 . ^ a b Halbedel, E. M. (February 1993), "tau Cas: a Variable Star after All?", Information Bulletin on Variable Stars , 3851 (3851): 1, Bibcode :1993IBVS.3851....1H . ^ a b c d Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal , 135 (1): 209– 231, Bibcode :2008AJ....135..209M , doi :10.1088/0004-6256/135/1/209 ^ Soubiran, C.; et al. (March 2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics , 480 (1): 91– 101, arXiv :0712.1370 Bibcode :2008A&A...480...91S , doi :10.1051/0004-6361:20078788 , S2CID 16602121 . ^ a b c d e f g h Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal , 150 (3): 88, arXiv :1507.01466 Bibcode :2015AJ....150...88L , doi :10.1088/0004-6256/150/3/88 , S2CID 118505114 ^ a b Wu, Yue; et al. (2010), "Coudé-feed stellar spectral library – atmospheric parameters", Astronomy & Astrophysics , 525 : A71, arXiv :1009.1491 Bibcode :2011A&A...525A..71W , doi :10.1051/0004-6361/201015014 , S2CID 53480665 . ^ "tau Cas" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-08-30 .{{cite web }}: CS1 maint: postscript (link )^ 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, arXiv :0806.2878 Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ Halbedel, E. M. (November 1989), "Another Opinion on the Variability of tau Cas", Information Bulletin on Variable Stars , 3394 (3394): 1, Bibcode :1989IBVS.3394....1H . ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Archived 2011-05-21 at the Wayback Machine
