Bibcode
Santander-García, Miguel; Corradi, Romano L. M.; Whitelock, Patricia A.; Munari, Ulisse; Mampaso, Antonio; Marang, Freddy; Boffi, Francesca; Livio, Mario
Referencia bibliográfica
Planetary Nebulae in our Galaxy and Beyond, Proceedings of the International Astronomical Union, Symposium #234. Edited by Michael J. Barlow and Roberto H. Méndez. Cambridge: Cambridge University Press, 2006., pp.503-504
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2006
Número de citas
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Descripción
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.