Interferometric Studies of the extreme binary, $ε$ Aurigae: Pre-eclipse Observations - AstrophysicsReport as inadecuate




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Abstract: We report new and archival K-band interferometric uniform disk diametersobtained with the Palomar Testbed Interferometer for the eclipsing binary star$\epsilon$ Aurigae, in advance of the start of its eclipse in 2009. Theobservations were inteded to test whether low amplitude variations in thesystem are connected with the F supergiant star primary, or with theintersystem material connecting the star with the enormous dark disksecondary inferred to cause the eclipses. Cepheid-like radial pulsations ofthe F star are not detected, nor do we find evidence for proposed 6% per decadeshrinkage of the F star. The measured 2.27 +- 0.11 milli-arcsecond K banddiameter is consistent with a 300 times solar radius F supergiant star at theHipparcos distance of 625 pc. These results provide an improved context forobservations during the 2009-2011 eclipse.



Author: R.Stencel, M. Creech-Eakman, A. Hart, J. Hopkins, B.Kloppenborg, D.Mais

Source: https://arxiv.org/







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