... The points represent a combination of model and actual spectra, e.g. the values for the compact planetary nebula HB 12 were measured from low-resolution spectra obtained with the NICMOS grisms. ...
... Figure: (after HSL) 2 m Imaging Polarimetry of CRL 2688 (The Egg Nebula) using NICMOS Camera 2, and the Cryogenic Optical Bench (COB) attached to the 2.1m at Kitt Peak (courtesy of J. Kastner). ...
... In Alonso-Herrero et al. (1997) we showed that the f ([Fe II ] m)/ line ratio in starburst galaxies is understood as transition from pure H II region (such as the Orion Nebula) to an increasing r?le of shock excitation by supernova remnants. ...
... are based on the SMOV program 11552 (PI: Bushouse), which comprises observations of the HST primary flux standard star GD153, and the wavelength calibrator planetary nebula HB12 (= PN G111.802.8) at several positions over the field-of-view (hereafter FoV ...
... are based on the SMOV program 11552 (PI: Bushouse), which comprises observations of the HST primary flux standard star GD153, and the wavelength calibrator planetary nebula HB12 (= PN G111.802.8) at several positions over the field-of-view (hereafter FoV ...