Red giant star in the constellation Eridanus
Pi Eridani , Latinized from π Eridani , is a star in the constellation Eridanus . It has an apparent visual magnitude of 4.40,[2] parallax measurements, it is located roughly 480 light years from the Sun .
This is an evolved red giant star with a stellar classification of M1 III,[5] asymptotic giant branch .[4] slow irregular variable type LB that can increase in magnitude up to 4.38.[3] [11] angular diameter of this star is ± 0.5 mas [12] radius of the Sun .[8] [9] outer atmosphere at an effective temperature of 3,841 K.[9]
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References
^ a b c d e 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 ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data , SIMBAD , Bibcode :1986EgUBV........0M .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 c Samus, N. N.; Durlevich, O. V.; et al. (2007), Combined General Catalogue of Variable Stars (GCVS4.2) , retrieved 2016-09-30 . VizieR On-line Data Catalog: B/gcvs . CS1 maint: postscript (link ) ^ a b Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal , 104 : 275, Bibcode :1992AJ....104..275E , doi :10.1086/116239 . ^ a b Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars , vol. 4, Bibcode :1988mcts.book.....H . ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters , 32 (11): 759–771, arXiv :1606.08053 Bibcode :2006AstL...32..759G , doi :10.1134/S1063773706110065 , S2CID 119231169 . ^ 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 Birkhäuser , ISBN 3-540-29692-1 * ) is given by:
2
⋅
R
∗
=
(
150
⋅
4.8
⋅
10
−
3
)
AU
0.0046491
AU
/
R
⨀
≈
155
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(150\cdot 4.8\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 155\cdot R_{\bigodot }\end{aligned}}}
^ a b c d 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 . ^ "* pi. Eri" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2016-10-11 .{{cite web }}: CS1 maint: postscript (link )^ Mennessier, M. O.; et al. (August 2001), "Long period variable stars: galactic populations and infrared luminosity calibrations", Astronomy and Astrophysics , 374 (3): 968–979, arXiv :astro-ph/0105552 Bibcode :2001A&A...374..968M , doi :10.1051/0004-6361:20010764 , S2CID 15721872 . ^ Richichi, A.; Percheron, I. (May 2005), "First results from the ESO VLTI calibrators program", Astronomy and Astrophysics , 434 (3): 1201–1209, arXiv :astro-ph/0501532 Bibcode :2005A&A...434.1201R , doi :10.1051/0004-6361:20042257 , S2CID 2847613 .
This page was last edited on 12 November 2022, at 09:54
This page was last edited on 12 November 2022, at 09:54