Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.8006f&link_type=abstract
HST Proposal ID #8006
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #8006 Stellar Astrophysics
Scientific paper
The locations of supernovae {SNe} in the local stellar and gaseous environment in galaxies contain important clues to their progenitor stars. Access to this information, however, has been hampered by the limited resolution achieved by ground -based observations. High spatial resolution images from HST of galaxy fields in which SNe had been observed can improve the situation considerably. They provide accurate determinations of any association of SNe with H II regions or star clusters. In cases where multi-filter observations are available, we can determine the local stellar environment and search for possible attenuation of the SN by dust in the host galaxy. By checking the fields for background sources, we can correct the existing SN light curves and luminosities if necessary. When a SN has been observed incidentally, information can be gained on its optical and UV emission. Deep HST images can be used to find light echoes of SNe, as well as recover SNe interacting with circumstellar material at very late times. A direct search for the progenitor stars of SNe can be made in pre-existing HST images of their locations. Finally, images of the host galaxies of high-redshift SNe provide their morphology, and comparison with the morphology of low-redshift hosts is a critical step in evaluating possible systematic effects in the use of SNe as cosmological distance indicators. We plan to concentrate our Cycle 7 analysis efforts on superior post-refurbishment images.
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