FIBEROPTICALLY MULTIPLEXED MEDIUM RESOLUTION SPECTROSCOPY FROM THE WIYN TELESCOPE, SINGLET D NEUTRAL OXYGEN, NH2, AND H2O+


    loading  Checking for direct PDF access through Ovid

Abstract

The WIYN 3.5-meter telescope and its Multi-Object Spectrograph (MOS)) have been used to obtain simultaneous spectra at many points in the coma of Comet Hale–Bopp. Between 1996 October and 1997 April in excess of 7500 individual spectra were obtained, typically 96 at a time. On six nights the ’’Hydra‘‘ fiber positioner was used to sample a ring pattern of points about the nucleus with a minimum spacing of 40 arc seconds and a maximum radius of 22.5 arc minutes. On four nights a new ’’Densepak‘‘ fiber cable was used. In this configuration a 7 × 13 rectangular pattern of 91, 3 arc second fibers on 4 arc second centers was used. In most cases the bench spectrograph was used in the echelle mode with an interference filter to isolate a single order. The wavelength range from 6100 Å to 6400 Å was recorded with resolution of approximately 15,000. This spectral region contains the emission features of [OI], C2, NH2and H2O+. From this mass of data we are beginning to extract the radial, azimuthal and temporal variations of many different spectral features. The radial profiles of [O I] λ6300 Å and NH2are reasonably well representable by the Haser model formalism, that of H2O+is not.

    loading  Loading Related Articles