Other
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9742h&link_type=abstract
HST Proposal ID #9742
Other
Hst Proposal Id #9742 Star Formation
Scientific paper
We propose to obtain V, H-alpha and [SII] images of the unique, eclipsing pre-main sequence star KH 15D near minimum light with the ACS/HRC. This solar-like star in NGC 2264, near the Cone Nebula, is fortuitously positioned with respect to our line of sight. Every 48.36 days its photosphere and accretion zone are progressively occulted and then revealed by an eclipsing body, which is evidently non-luminous, extended circumstellar matter in the star's vicinity. Dramatic spectral evolution is seen during these "natural cononagraphic" events that is revealing the structure of the accretion zone on spatial scales { 0.01 AU or less} that may not be achieved in other sources for decades to come, if ever. It is important to know whether this object is unique only in its orientation and not in its basic structure. Our observations will test the hypothesis that KH 15D at minimum light looks like nearly edge-on disk/jet systems around stars of similar mass and age in closer star forming regions such as Tau/Aur or MBM 12. We argue that the disk and jet will be resolved and will provide new constraints on this system. If not resolved, the data will at least constrain the scattering and jet emission zones to be remarkably close to the star { 10 AU}. In either case, we will have important new information on the nature of this unique object.
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