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K-type giant star in the constellation Cassiopeia
Tau Cassiopeiae (τ Cassiopeiae) is a solitary,
[10] orange hued
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] Based upon an annual
parallax shift of 18.75
mas as seen from Earth,
[1] this system is located about 174
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] It is a suspected
variable star of unknown type.
[4]
[11] Tau Cassiopeiae is 3.9
[7] billion years old with about 1.44
[7] times the
mass of the Sun and 10
[5] times the
Sun's radius . It is radiating 40
[7] times the
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 , refers to an
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): 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): 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
