Decoding the Inner Disk about - Pictoris

Details Decoding the Inner Disk about - Pictoris Decoding the Inner Disk about - Pictoris

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6470s&link_type=abstract

HST Proposal ID #6470

Computer Science

Hst Proposal Id #6470 Binaries And Star Fo

Scientific paper

The FOS will be used to study the UV emission linecharacteristics of the inner disk about Beta Pictoris at adistance of 1.3" from the star. Our goal is to investigatethe proposed infall and subsequent sublimation of comet-likebodies into beta Pictoris and to study the composition ofinner disk material. Due to the favorable edge-on orientationof the disk, the gaseous component of the disk has beendetected in absorption. The inner disk gases are excited, dissociated, and ionized by stellar photons. The detection ofemissions from the gaseous disk in the vicinity of the star,possibly cometary in nature (eg., CS 2576 Angstrom, OH 3064Angstrom), would unequivocally establish the sublimation ofcomet-like bodies or possibly volatiles from grains within thecircumstellar disk. Our ultimate goal is to ascertain thecomposition of the inner disk.The GHRS will be employed to acquire the bright targets(alpha and beta Pictoris) followed by slewing the telescope toposition the targets into the FOS aperture. The core of the PSFwill be positioned behind the space separating the FOS 0.5-PAIRapertures. Spectra using the G190H and G270H gratings, spectralinterval 1573 - 3301 Angstrom, will be obtained of both sidesof the disk. Cycle 6 is the last opportunity to assess the spectralcharacteristics of the inner disk material in this wavelength region.

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