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Book Sections Cartography of the Sun and the Stars, Lecture Notes in Physics Year : 2016

Interferometry to Determine Stellar Shapes: Application to Achernar

Abstract

The shape of stellar photospheres can depart significantly from the spherical geometry, due e.g. to fast rotation. In this chapter, I focus on the application of long-baseline interferometry to the determination of the photospheric shape of fast rotating stars. I present the example of the VLT Interferometer observations of the nearby Be star Achernar (α Eri), using the VINCI (two telescopes) and PIONIER (four telescopes) beam combiners. I present the adjustment of a simplified model of the light distribution of Achernar to the measured interferometric visibilities and closure phases . This example application is based on the LITpro software from the JMMC.

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Dates and versions

insu-03634271 , version 1 (07-04-2022)

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Pierre Kervella. Interferometry to Determine Stellar Shapes: Application to Achernar. Cartography of the Sun and the Stars, pp.127-135, 2016, ⟨10.1007/978-3-319-24151-7_6⟩. ⟨insu-03634271⟩
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