Binary star system in the constellation Eridanus
Tau4 Eridani (τ4 Eridani, τ4 Eri) is a binary star system in the constellation Eridanus . It is visible to the naked eye with an apparent visual magnitude of 3.65.[2] parallax method , which yields a value of roughly 300 light years .[1]
A visual band light curve for Tau4 Eridani, plotted from data published by Tabur et al. (2009)[13] This is an evolved red giant star currently on the asymptotic giant branch [3] stellar classification of M3/4 III.[4] slow irregular variable star of type Lb, undergoing changes in magnitude over the range 3.57−3.72[5] [13] angular diameter of Tau4 Eridani is ± 1.00 mas [14] radius of the Sun .[10] [11] luminosity of the Sun from an outer atmosphere at an effective temperature of 3,712 K.[9]
This is most likely a binary star system.[15] angular separation of 5.7″ along a position angle of 291°, as of 2013.[16]
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 ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data , SIMBAD , Bibcode :1986EgUBV........0M .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 Lebzelter, T.; Hron, J. (January 2008), "BRITE stars on the AGB" (PDF) , Communications in Asteroseismology , 152 : 178–181, Bibcode :2008CoAst.152..178L , doi :10.1553/cia152s178 ^ 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 . ^ a b Ruban, E. V.; et al. (September 2006), "Spectrophotometric observations of variable stars", Astronomy Letters , 32 (9): 604–607, Bibcode :2006AstL...32..604R , doi :10.1134/S1063773706090052 , S2CID 121747360 . ^ 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 . ^ Brown, A. G. A. ; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties" . Astronomy & Astrophysics 649 : A1. arXiv :2012.01533 Bibcode :2021A&A...649A...1G . doi :10.1051/0004-6361/202039657 S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source at VizieR .^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics , 430 : 303–311, arXiv :astro-ph/0409683 Bibcode :2005A&A...430..303C , doi :10.1051/0004-6361:20041440 , S2CID 12136256 . ^ a b c Halabi, Ghina M.; Eid, Mounib El (2015). "Exploring masses and CNO surface abundances of red giant stars". Monthly Notices of the Royal Astronomical Society . 451 (3): 2957. arXiv :1507.01517 Bibcode :2015MNRAS.451.2957H . doi :10.1093/mnras/stv1141 . S2CID 118707332 . ^ a b Lang, Kenneth R. (2006), Astrophysical formulae Birkhäuser , ISBN 3-540-29692-1 * ) is given by:
2
⋅
R
∗
=
(
93
⋅
10.58
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10
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3
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AU
0.0046491
AU
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R
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212
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{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(93\cdot 10.58\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 212\cdot R_{\bigodot }\end{aligned}}}
^ a b 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 . ^ "tau04 Eri" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2016-10-13 .{{cite web }}: CS1 maint: postscript (link )^ a b Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961, arXiv :0908.3228 Bibcode :2009MNRAS.400.1945T , doi :10.1111/j.1365-2966.2009.15588.x , S2CID 15358380 . ^ 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 . ^ 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 . ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog" , The Astronomical Journal , 122 (6): 3466–3471, Bibcode :2001AJ....122.3466M , doi :10.1086/323920 , retrieved 2015-07-22
This page was last edited on 12 November 2022, at 10:08
This page was last edited on 12 November 2022, at 10:08