Fast, gusty winds blowing from the core of the pre-planetary nebula M 2-56

Details Fast, gusty winds blowing from the core of the pre-planetary nebula M 2-56 Fast, gusty winds blowing from the core of the pre-planetary nebula M 2-56

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..549s&link_type=abstract

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report optical long-slit spectra and direct imaging (ground-based and with the Hubble Space Telescope, HST) of the pre-planetary nebula M 2-56 obtained at different epochs. The optical nebula is composed of shock-excited material distributed in two pairs of nested lobes with different sizes and surface brightness. Within the ILs and the OLs, the velocity increases with the distance to the center, however, the ILs show expansion velocities larger than the OLs. Consistent with the large speeds reached by the ILs (of up to about 350 km/s at the tips), we have measured the expansive proper motions of the knots (about 0.03 arcsec/yr) by comparing HST images taken in 1998 and 2002. Moreover, we have discovered remarkable changes with time in the continuum and line emission spectrum of M 2-56. In 1998, we detected a burst of Halpha emission from the nebula nucleus that is interpreted as an indication of a dense, fast (about 350-500 km/s) bipolar wind from the nebula's core (referred to as ``F1-wind''). Such a wind has been recently ejected (after 1989) probably as a short-duration mass-loss event. Our data also reveal an optically thick compact cocoon (or shell-like structure) and an H II region around the central star that result from further post-asymptotic giant branch (post-AGB) mass loss after the F1-wind. Recent brightening of the scattered stellar continuum as well as an increase of scattered Halpha emission along the lobes is reported, both results pointing to a decrease of the optical depth of the circumstellar material enshrouding the star.

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