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He 2-147: A case in which the expansion parallax method fails

Published online by Cambridge University Press:  15 December 2006

Miguel Santander-García
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain, email: miguelsg@iac.es
Romano L. M. Corradi
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain, email: miguelsg@iac.es Isaac Newton Group of Telescopes, Ap. de Correos 321, 38700 Sta. Cruz de la Palma, Spain
Patricia A. Whitelock
Affiliation:
South African Astronomical Observatory, PO Box 9, 7935 Observatory, South Africa Department of Mathematics and Applied Mathematics and Department of Astronomy, University of Cape Town, South Africa
Ulisse Munari
Affiliation:
INAF Osservatorio Astronomico di Padova, via dell'Osservatorio 8, 36012 Asiago (VI), Italy
Antonio Mampaso
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain, email: miguelsg@iac.es
Freddy Marang
Affiliation:
South African Astronomical Observatory, PO Box 9, 7935 Observatory, South Africa
Francesca Boffi
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Mario Livio
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
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Abstract

HST multi-epoch images and VLT integral-field, high resolution spectroscopy allowed us a robust determination of the 3-D geometry and orientation of the nebula surrounding He 2-147, and to measure its apparent expansion in the plane of the sky. Applying the expansion parallax method results in a distance which is significantly shorter that the one obtained via the period-luminosity (P-L) relationship for the Mira component. We show how allowing for shock excitation of the nebula, as suggested by the extremely broad nebular line profiles, enables both distance derivations to be reconciled.

Type
Contributed Papers
Copyright
© 2006 International Astronomical Union
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He 2-147: A case in which the expansion parallax method fails
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