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The photosphere and circumstellar environment of the Be star Achernar

Published online by Cambridge University Press:  23 January 2015

Daniel M. Faes ,
Armando Domiciano de Souza ,
Alex C. Carciofi  and
Philippe Bendjoya
Daniel M. Faes
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-900, São Paulo, SP, Brazil email: moser@usp.br Lab. J.-L. Lagrange, UMR 7293 - Observatoire de la Côte d'Azur (OCA), Univ. de Nice-Sophia Antipolis (UNS), CNRS, Valrose, 06108 Nice, France
Armando Domiciano de Souza
Affiliation:
Lab. J.-L. Lagrange, UMR 7293 - Observatoire de la Côte d'Azur (OCA), Univ. de Nice-Sophia Antipolis (UNS), CNRS, Valrose, 06108 Nice, France
Alex C. Carciofi
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-900, São Paulo, SP, Brazil email: moser@usp.br
Philippe Bendjoya
Affiliation:
Lab. J.-L. Lagrange, UMR 7293 - Observatoire de la Côte d'Azur (OCA), Univ. de Nice-Sophia Antipolis (UNS), CNRS, Valrose, 06108 Nice, France
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Abstract

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Achernar is a key target to investigate high stellar rotation and the Be phenonemon. It is also the hottest star for which detailed photospheric information is available. Here we report our results to determine the photospheric parameters of Achernar and evaluate how the emission of a Viscous Decretion Disk (VDD) around it would be observable. The analysis is based on interferometric data (PIONIER and AMBER at ESO-VLTI), complemented by spectroscopy and polarimetry for the circumstellar emission. For the first time fundamental parameters of a Be photosphere were determined. The presence of a residual disk at the quiescent phase and some characteristics of the new formed disk (2013 activity) are also discussed. This is rare opportunity to precisely determine the stellar brightness distribution and evaluate the evolution of a just formed Be disk.

Keywords

stars: individual (Achernar)stars: fundamental parameterstechniques: interferometriccircumstellar matterstars: emission-lineBe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 261 - 266
Copyright
Copyright © International Astronomical Union 2015 

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