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Contreras, C. Sánchez ; Le Mignant, D. ; Sahai, R. ; Gil de Paz, Armando ; Morris, M. | American Astronomical Society | 2007-02-20We present high angular resolution images of the post-AGB nebula IRAS 18276-1431 (also known as OH 17.7-2.0) obtained with the Keck II adaptive optics (AO) system in its natural guide star (NGS) mode in the K_P, L_P, and M_S near-infrared bands.[...]texto impreso
Sahai, R. ; Findeisen, K. ; Gil de Paz, Armando ; Sánchez Contreras, C. | American Astronomical Society | 2008-12-20The search for binarity in AGB stars is of critical importance for our understanding of how planetary nebulae acquire the dazzling variety of aspherical shapes which characterizes this class. However, detecting binary companions in such stars ha[...]texto impreso
Sánchez Contreras, C. ; Sahai, R. ; Gil de Paz, Armando ; Goodrich, R. | University Chicago Press | 2008-11We present echelle long-slit optical spectra of a sample of objects evolving off the asymptotic giant branch (AGB), most of them in the preplanetary nebula (PPN) phase, obtained with the ESI and MIKE spectrographs at the 10 m Keck II and 6.5 m M[...]texto impreso
In this paper we present optical long-slit spectroscopy and imaging of the proto-planetary nebula CRL 618. The optical lobes of CRL 618 consist of shock-excited gas, which emits many recombination and forbidden lines, and dust, which scatters li[...]texto impreso
We present deep optical long-slit spectra of the peculiar protoplanetary nebula (PPN) OH 231.8+4.2 obtained with the 6.5 m Baade Telescope at Las Campanas Observatory (Chile). In addition to the molecular absorption bands characteristic of the M[...]
