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. With an annual parallax shift of 0.02165 arcseconds , it lies at an estimated distance of about 151 light years .
This is an evolved giant star with a stellar classification of K0 III. 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.
References
^ 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 .
^ 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 .
^ 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
^ 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.
^ 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
"iot Eri" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2016-10-29.{{cite web }}: CS1 maint: postscript (link )
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