Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6770o&link_type=abstract
HST Proposal ID #6770
Computer Science
Hst Proposal Id #6770 Interstellar Medium
Scientific paper
We propose to conduct WFC observations of the nebular remnants of 11 novae. We have already demonstrated the usefulness of these observations with a deep, predominantly H alpha, imaging survey of 37 classical nova remnants using the William Herschel and Anglo-Australian Telescopes. This has resulted in the detection of new nebular remnants and the resolution of detailed structure in previously known remnants. The data indicate a strong correlation between nova speed class and the ellipticity of the resulting remnants - those of faster novae tend to comprise randomly distributed clumps of ejecta superposed on spherically-symmetric diffuse material, whilst slower novae produce more structured ellipsoidal remnants with at least one and sometimes several rings of enhanced emission. High-resolution optical images of these faint, and often rather small {several arcseconds} structures will enable us to classify them, thereby placing nova shell research on a similar footing to studies of the shaping of planetary nebulae. The results will have implications for the dynamics of common-envelopes, hydrodynamic instabilities and dust formation in novae, the calibration of the distance scale and the determination of ejecta masses.
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