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Tau4 Eridani

Binary star system in the constellation Eridanus From Wikipedia, the free encyclopedia

Tau4 Eridani
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Tau4 Eridani4 Eridani, τ4 Eri) is a binary star system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude that varies from 3.57 to 3.72.[2] The distance to this star can be estimated using the parallax method, which yields a value of roughly 300 light years.[1]

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A visual band light curve for Tau4 Eridani, plotted from data published by Tabur et al. (2009)[16]
Quick Facts Apparent magnitude (V), Characteristics ...

The primary components ia an evolved red giant star currently on the asymptotic giant branch[5] with a stellar classification of M3/4 III.[6] It is a slow irregular variable star of type Lb, undergoing changes in magnitude over the range 3.57−3.72[2] with a periodicity of 23.8 d.[16] This star has 1.73 times the mass of the Sun[11] and 103 times the radius of the Sun.[12] It shines with 1,537 times the luminosity of the Sun from its photosphere[13] at an effective temperature of 3,650 K.[12]

The secondary is a magnitude 9.5 star at an angular separation of 5.7 along a position angle of 291°, as of 2013.[4] This angular separation implies a projected separation of 5,800 astronomical units.[10]

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