From Wikipedia, the free encyclopedia
Star in the constellation Chamaleon
Gamma Chamaeleontis ,
Latinized from γ Chamaeleontis, is a solitary
[9]
star located in the southern
circumpolar constellation of
Chamaeleon . It can faintly be seen with the naked eye on a dark night, having an
apparent visual magnitude of 4.12.
[2] Based upon an annual
parallax shift of 7.81
mas ,
[1] it is located around 418
light years from the
Sun .
This is an
evolved
K-type
giant star with a
stellar classification of K5 III.
[3] The measured
angular diameter , after correction for
limb darkening , is 4.86± 0.05
mas .
[10] At the estimated distance of the star, this yields a physical size of about 67 times the
radius of the Sun .
[6] It is a suspected
variable star , with an
amplitude of 0.01 magnitude.
[11] The star radiates 864 times the
solar luminosity from its
outer atmosphere with an
effective temperature of 4,053 K.
[7]
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d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data ,
SIMBAD ,
Bibcode :
1986EgUBV........0M .
^
a
b Houk, N.; Cowley, A. P. (1975), "Catalogue of two-dimensional spectral types for the HD stars", University of Michigan , I ,
Bibcode :
1975mcts.book.....H .
^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb , 35 (35), Astronomisches Rechen-Institut Heidelberg: 1,
Bibcode :
1999VeARI..35....1W .
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331,
arXiv :
1108.4971 ,
Bibcode :
2012AstL...38..331A ,
doi :
10.1134/S1063773712050015 ,
S2CID
119257644 .
^
a
b Lang, Kenneth R. (2006),
Astrophysical formulae , Astronomy and astrophysics library, vol. 1 (3rd ed.),
Birkhäuser ,
ISBN
3-540-29692-1 . The radius (R* ) is given by:
2
⋅
R
∗
=
(
128
⋅
4.86
⋅
10
−
3
)
AU
0.0046491
AU
/
R
⨀
≈
133.8
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(128\cdot 4.86\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 133.8\cdot R_{\bigodot }\end{aligned}}}
^
a
b
c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–57,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^
"gam Cha" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2016-12-11 . {{
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 .
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2): 773–777,
Bibcode :
2005A&A...431..773R ,
doi :
10.1051/0004-6361:20042039 .
^ Eggen, O. J. (1973), "The classification of intrinsic variables. IV. Very-small-amplitude, very-short-period red variables", Astrophysical Journal , 184 : 793,
Bibcode :
1973ApJ...184..793E ,
doi :
10.1086/152371 .