Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..218f&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 218-218
Astronomy and Astrophysics
Astronomy
Scientific paper
Hubble 4 is a well studied bipolar planetary nebula (PN). It is known to present off-axis spouts, known as FLIERs (Fast Low-Ionization Emission Regions), which are inclined by 62 degrees with respect to the main bipolar structure, oriented roughly NS. Only few such objects are known; most FLIERs being aligned with the longest elongation axis of their PN. We retreived WFPC2 frames of Hubble 4 available in the F656N (Ha) and F658N ([NII]) narrow bandpass filters from the HST archive. An "à trous" ("with holes") wavelet decomposition of the combined filters was obtained. Using a multiscale vision model similar to the one introduced by Bijaoui and Rué (1995, Signal Processing, 46, 345) we were able to identify and reconstruct many complex and sometimes faint structures present in the nebula. We first show that Hubble 4 also presents an extended outer shell, a faint secondary bipolar structure aligned with the main FLIERs, and secondary FLIERs. We were also able to evidence a bright internal rim, which we identify with the interaction of the fast wind from the central star with the surrounding nebula. We finally detect a faint extended halo, from which we derive a mass. We discuss the implication of the existence of this halo on the distance of this nebula.
Cuisinier Francois
Ferreira Mendonca L.
Lorenz-Martins Silvia
Moisés A. P.
Rabaca Carlos Roberto
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