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{{short description|Solitary red clump giant star in the constellation Eridanus}}
{{Starbox begin
{{Starbox begin
| name = [[Bayer designation|ι Eridani]]}}
| name = [[Bayer designation|ι Eridani]]}}
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}}
}}
{{Starbox character
{{Starbox character
| type = [[Red clump]]<ref name=Liu2007/>
| class = K0&nbsp;III<ref name=houk1978/>
| class = K0&nbsp;III<ref name=houk1978/>
| u-b = +0.74<ref name=Johnson1996/>
| u-b = +0.74<ref name=Johnson1996/>
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}}
}}
{{Starbox detail
{{Starbox detail
| mass = 1.42<ref name=Johnson1996/>
| source = <ref name=Gallenne2017/>
| mass = {{val|1.29|0.01}}
| radius = 11<ref name=lang2006/>
| radius = {{val|11.17|0.06}}
| luminosity = 57.5<ref name=Johnson1996/>
| luminosity = {{val|54.7|0.5}}
| temperature = {{Val|4683|35|fmt=commas}}<ref name=Johnson1996/>
| temperature = {{val|4700|30|fmt=commas}}
| gravity = {{Val|2.60|0.10}}<ref name=Alves2015/>
| metal_fe = {{Val|−0.33|0.10}}<ref name=Alves2015/>
| gravity = {{val|2.65|0.10}}
| metal_fe = {{Val|-0.34|0.02}}
| rotational_velocity =
| rotational_velocity =
| age_gyr = 4.12<ref name=Johnson1996/>
| age_gyr = {{val|3.55|0.12}}
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = ι Eri, [[Catalogues of Fundamental Stars|FK5]] 1075, [[Henry Draper Catalogue|HD]] 16815, [[Hipparcos Catalogue|HIP]] 12486, [[Bright Star Catalogue|HR]] 794, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 215999.<ref name=SIMBAD/>
| names = ι Eri, [[Cordoba Durchmusterung|CD]]−40° 689, [[Catalogues of Fundamental Stars|FK5]] 1075, [[Henry Draper Catalogue|HD]] 16815, [[Hipparcos Catalogue|HIP]]&nbsp;12486, [[Bright Star Catalogue|HR]] 794, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 215999.<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
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'''Iota Eridani''' ('''ι Eri''') is a solitary [[star]] in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. It is visible to the naked eye with an [[apparent magnitude]] of 4.11.<ref name=Johnson1996/> With an annual [[stellar parallax|parallax shift]] of 0.02165&nbsp;[[arcsecond]]s,<ref name=vanLeeuwen2007/> it lies at an estimated distance of about 151&nbsp;[[light year]]s.
'''Iota Eridani''' ('''ι Eri''') is a solitary [[star]] in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. It is visible to the naked eye with an [[apparent magnitude]] of 4.11.<ref name=Johnson1996/> With an annual [[stellar parallax|parallax shift]] of 0.02165&nbsp;[[arcsecond]]s,<ref name=vanLeeuwen2007/> it lies at an estimated distance of about 151&nbsp;[[light year]]s.


This is a [[stellar evolution|evolved]] [[red clump]]<ref name=Liu2007/> [[giant star]] with a [[stellar classification]] of K0&nbsp;III.<ref name=houk1978/> The measured [[angular diameter]], after correcting for [[limb darkening]], is {{Val|2.18|0.02|u=[[milliarcsecond|mas]]}}.<ref name=Richichi2005/> At an estimated distance of the star, this yields a physical size of around 11 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> It has 1.42 times the mass of the Sun and radiates 57.5 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 4,683&nbsp;K.<ref name=Johnson1996/> It is around four billion years old.<ref name=Johnson1996/>
This is an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K0&nbsp;III.<ref name=houk1978/> The measured [[angular diameter]], after correcting for [[limb darkening]], is {{Val|2.248|0.014|u=[[milliarcsecond|mas]]}}. This star is 3.55 billion years old, sufficient to have exhausted the hydrogen at its core and reached a [[red clump]] stage. It is only around 29% more massive than the Sun, but is eleven times larger. It radiates 54.7 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 4,700&nbsp;K.<ref name=Gallenne2017/>


==References==
==References==
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| volume=474 | issue=2 | pages=653–664 | date=2007
| volume=474 | issue=2 | pages=653–664 | date=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | postscript=. }}</ref>
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref>


<ref name=houk1978>{{citation
<ref name=houk1978>{{citation
| last1=Houk | first1=Nancy | year=1978
| last1=Houk | first1=Nancy | year=1978
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=2 | publication-place=Ann Arbor
| volume=2 | location=Ann Arbor
| publisher=Dept. of Astronomy, University of Michigan
| publisher=Dept. of Astronomy, University of Michigan
| bibcode=1978mcts.book.....H | postscript=. }}</ref>
| bibcode=1978mcts.book.....H | postscript=. }}</ref>

<ref name=Alves2015>{{citation
| display-authors=1 | last1=Alves | first1=S.
| last2=Benamati | first2=L. | last3=Santos | first3=N. C.
| last4=Adibekyan | first4=V. Zh. | last5=Sousa | first5=S. G.
| last6=Israelian | first6=G. | last7=De Medeiros | first7=J. R.
| last8=Lovis | first8=C. | last9=Udry | first9=S.
| title=Determination of the spectroscopic stellar parameters for 257 field giant stars
| journal=Monthly Notices of the Royal Astronomical Society
| volume=448 | issue=3 | pages=2749–2765 | date=April 2015
| doi=10.1093/mnras/stv189 | bibcode=2015MNRAS.448.2749A
⚫
| arxiv=1503.02556 | postscript=. }}</ref>


<ref name=deBruijne2012>{{citation
<ref name=deBruijne2012>{{citation
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| volume=546 | id=A61 | pages=14 | date=October 2012
| volume=546 | id=A61 | pages=14 | date=October 2012
| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D
| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D
| arxiv=1208.3048 | postscript=. }}</ref>
| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>


<ref name=Liu2007>{{cite journal
<ref name=Liu2007>{{citation
| display-authors=1 | last1=Liu | first1=Y. J.
| display-authors=1 | last1=Liu | first1=Y. J.
| last2=Zhao | first2=G. | last3=Shi | first3=J. R.
| last2=Zhao | first2=G. | last3=Shi | first3=J. R.
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| volume=382 | issue=2 | pages=553–66 | date=2007
| volume=382 | issue=2 | pages=553–66 | date=2007
| bibcode=2007MNRAS.382..553L | doi=10.1111/j.1365-2966.2007.11852.x
| bibcode=2007MNRAS.382..553L | doi=10.1111/j.1365-2966.2007.11852.x
| postscript=. }}</ref>
| doi-access=free }}</ref>

<ref name=Gallenne2017>{{Citation |last1=Gallenne |first1=A. |last2=Pietrzyński |first2=G. |last3=Graczyk |first3=D. |last4=Nardetto |first4=N. |last5=Mérand |first5=A. |last6=Kervella |first6=P. |last7=Gieren |first7=W. |last8=Villanova |first8=S. |last9=Mennickent |first9=R. E. |last10=Pilecki |first10=B. |date=2018-08-01 |title=Fundamental properties of red-clump stars from long-baseline H-band interferometry |journal=[[Astronomy & Astrophysics]] |arxiv=1806.09572 |language=en |volume=616 |pages=A68 |doi=10.1051/0004-6361/201833341 |bibcode=2018A&A...616A..68G |issn=0004-6361}}</ref>


<ref name=Johnson1996>{{citation
<ref name=Johnson1996>{{citation
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| title=UBVRIJKL photometry of the bright stars
| title=UBVRIJKL photometry of the bright stars
| journal=Communications of the Lunar and Planetary Laboratory
| journal=Communications of the Lunar and Planetary Laboratory
| volume=4 | issue=99 | year=1966 | arxiv=1507.01466
| volume=4 | issue=99 | year=1966 | page=99 | doi=| arxiv=
| bibcode=1966CoLPL...4...99J | postscript=. }}</ref>
| bibcode=1966CoLPL...4...99J | s2cid=| postscript=. }}</ref>

<ref name=Richichi2005>{{citation
| display-authors=1 | last1=Richichi | first1=A.
| last2=Percheron | first2=I. | last3=Khristoforova | first3=M.
| title=CHARM2: An updated Catalog of High Angular Resolution Measurements
| journal=Astronomy and Astrophysics
| volume=431 | pages=773–777 | date=February 2005
| doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R
| postscript=. }}</ref>

<ref name=lang2006>{{citation
| first1=Kenneth R. | last1=Lang
| title=Astrophysical formulae | volume=1
| series=Astronomy and astrophysics library | edition=3rd
| publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1
| url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41
| postscript=. }} The radius (R<sub>*</sub>) is given by:
:<math>\begin{align} 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{align}</math></ref>


<ref name=SIMBAD>{{citation
<ref name=SIMBAD>{{cite simbad
| title=iot Eri -- Star
| title=iot Eri
⚫
| access-date=2016-10-29 | postscript=. }}</ref>
| work=SIMBAD Astronomical Database
| publisher=Centre de Données astronomiques de Strasbourg
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=iot+Eri
| accessdate=2016-10-29 | postscript=. }}</ref>


}}
}}
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{{Stars of Eridanus|state=collapsed}}
{{Stars of Eridanus|state=collapsed}}


{{DEFAULTSORT:Iota Eridani}}
[[Category:K-type giants]]
[[Category:K-type giants]]
[[Category:Horizontal-branch stars]]
[[Category:Eridanus (constellation)]]
[[Category:Eridanus (constellation)]]
[[Category:Bayer objects|Eridani, Iota]]
[[Category:Bayer objects|Eridani, Iota]]
[[Category:Henry Draper Catalogue objects|016815]]
[[Category:Henry Draper Catalogue objects|016815]]
[[Category:Hipparcos objects|012486]]
[[Category:Hipparcos objects|012486]]
[[Category:HR objects|0794]]
[[Category:Bright Star Catalogue objects|0794]]
[[Category:Durchmusterung objects]]

Latest revision as of 03:39, 1 January 2025

ι Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 02h 40m 40.03501s[1]
Declination −39° 51′ 19.3541″[1]
Apparent magnitude (V) 4.11[2]
Characteristics
Evolutionary stage Red clump[3]
Spectral type K0 III[4]
U−B color index +0.74[2]
B−V color index +1.02[2]
Astrometry
Radial velocity (Rv)−9.30±0.70[5] km/s
Proper motion (μ) RA: +135.92[1] mas/yr
Dec.: −27.53[1] mas/yr
Parallax (π)21.65 ± 0.18 mas[1]
Distance151 ± 1 ly
(46.2 ± 0.4 pc)
Absolute magnitude (MV)0.877[3]
Details[6]
Mass1.29±0.01 M☉
Radius11.17±0.06 R☉
Luminosity54.7±0.5 L☉
Surface gravity (log g)2.65±0.10 cgs
Temperature4,700±30 K
Metallicity [Fe/H]−0.34±0.02 dex
Age3.55±0.12 Gyr
Other designations
ι Eri, CD−40° 689, FK5 1075, HD 16815, HIP 12486, HR 794, SAO 215999.[7]
Database references
SIMBADdata

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 giant star with a stellar classification of K0 III.[4] The measured angular diameter, after correcting for limb darkening, is 2.248±0.014 mas. This star is 3.55 billion years old, sufficient to have exhausted the hydrogen at its core and reached a red clump stage. It is only around 29% more massive than the Sun, but is eleven times larger. It radiates 54.7 times the solar luminosity from its outer atmosphere at an effective temperature of 4,700 K.[6]

References

[edit]
  1. ^ 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.
  2. ^ a b c d 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.
  3. ^ 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
  4. ^ 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.
  5. ^ 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.
  6. ^ a b Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S.; Mennickent, R. E.; Pilecki, B. (2018-08-01), "Fundamental properties of red-clump stars from long-baseline H-band interferometry", Astronomy & Astrophysics, 616: A68, arXiv:1806.09572, Bibcode:2018A&A...616A..68G, doi:10.1051/0004-6361/201833341, ISSN 0004-6361
  7. ^ "iot Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-29.{{cite web}}: CS1 maint: postscript (link)
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