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Solitary red clump giant star in the constellation Eridanus
Iota Eridani (ι Eri ) is a solitary
star in the
constellation
Eridanus . It is visible to the naked eye with an
apparent magnitude of 4.11.
[2] With an annual
parallax shift of 0.02165
arcseconds ,
[1] it lies at an estimated distance of about 151
light years .
This is an
evolved
red clump
[5]
giant star with a
stellar classification of K0 III.
[3] The measured
angular diameter , after correcting for
limb darkening , is ± 0.02
mas
[9] At an estimated distance of the star, this yields a physical size of around 11 times the
radius of the Sun .
[6] It has 1.42 times the mass of the Sun and radiates 57.5 times the
solar luminosity from its
outer atmosphere at an
effective temperature of 4,683 K.
[2] It is around four billion years old.
[2]
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 e f g h i j Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99,
Bibcode :
1966CoLPL...4...99J . ^
a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan,
Bibcode :
1978mcts.book.....H .
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14,
arXiv :
1208.3048 ,
Bibcode :
2012A&A...546A..61D ,
doi :
10.1051/0004-6361/201219219 ,
S2CID
59451347 , A61. ^
a b Liu, Y. J.; et al. (2007).
"The abundances of nearby red clump giants" . Monthly Notices of the Royal Astronomical Society . 382 (2): 553–66.
Bibcode :
2007MNRAS.382..553L .
doi :
10.1111/j.1365-2966.2007.11852.x . ^
a b Lang, Kenneth R. (2006),
Astrophysical formulae Birkhäuser ,
ISBN
3-540-29692-1 * ) is given by:
2
⋅
R
∗
=
(
46.2
⋅
2.18
⋅
10
−
3
)
AU
0.0046491
AU
/
R
⨀
≈
21.7
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(46.2\cdot 2.18\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 21.7\cdot R_{\bigodot }\end{aligned}}}
^
a b Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society , 448 (3): 2749–2765,
arXiv :
1503.02556 ,
Bibcode :
2015MNRAS.448.2749A ,
doi :
10.1093/mnras/stv189 ,
S2CID
119217930 .
^
"iot Eri" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2016-10-29 . {{
cite web }}: CS1 maint: postscript (
link )
^ 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 .
